Whether
you are an athlete on one of Brown's varsity teams, someone who
works out regularly at the gym, or are just considering getting
more physically active, you may be wondering how what you eat and
drink affects your performance. The world of sports nutrition can
be particularly confusing, because you may get conflicting information
from magazines, web sites, coaches, or friends. Should you eat special
foods before you compete? Should you take special supplements to
bulk up? Can you be a vegetarian and expect to be powerful? Checking
out the topics and web links in this section will help you fuel
up for fitness.
Do
nutrition needs of an athlete differ from other students?
It may surprise you to learn that in many ways, your nutritional
requirements aren't much different from a student who has chosen
to be less active. You both have the same needs for a variety of
nutrients, including vitamins and minerals, about the same requirements
for fat, and surprisingly, your need for protein is only slightly
higher as an athlete than that of the non-athlete. One important
nutritional difference you have as an athlete is that your carbohydrate
needs are generally much higher. "Carbs" are the body's
most efficient energy source, one upon which all athletes and active
people rely. Without adequate carbohydrate sources in the diet,
you will "hit the wall" very quickly when you work out,
and find that overall, you just aren't feeling up to par. If your
sport or physical activity patterns require a higher energy intake,
you can eat more from all the food groups, and may even have extra
room for foods usually thought of as empty calorie treats (more
desserts, soda, higher sugar granola bars, etc.).
To compare
how your nutritional needs as a more active person might differ
from the non-athlete, you first may want to review nutrition recommendations
for all healthy people. Check out our section about the U.S.
Dietary Guidelines.
You may also want to take a look at the current Food
Guide Pyramid, with its range of recommended servings
that meet the varying needs of most individuals, including many
athletes.
The 5
major food groups in the Food Guide will give you the major nutrients
your active body needs:
Protein
Carbohydrates
Fats
(also called lipids)
Vitamins
Minerals
Another
important "nutrient" not included in the Food Guide
Pyramid, but extremely important for athletes is water, or fluids.
An athlete's
specific needs within each of these nutrient groups is discussed
below.
How
Many Servings Do I Need Each Day?
The following chart gives nutrition guidelines for the very active
and less active male and female college-age student. (Note: Current
recommendations suggest that all individuals aim for 30 to 60 minutes
of moderate exercise per day. Keeping active at this level helps
to maintain a healthy weight, build good bone density, keep a positive
mental outlook, and avoid many chronic diseases, such as diabetes,
heart disease, and many cancers).
Number
of servings per day
Female
Non-Athletes
Female
Athletes,
Male Non-Athletes
Male
Athletes
Bread/Grains
Group
6
to 11
9
to 15
11
to 18
Vegetable
Group
3+
3+
3+
Fruit
Group
2
to 4
3
to 5
4
to 8+
Dairy
Group
4**
4+**
4
to 5+**
Protein/Meat
Group
2
(=5oz.)
2
(=6oz.)
3
(=7 to 11oz.)
Fats/Lipids***
20
to 35% calories
20
to 35% calories
20
to 35% calories
**You
need 4 servings of dairy products (including calcium-fortified dairy
substitute products) per day until age 24, when your bones near
their maximum bone density. 3 servings plus a 500 mg calcium supplement
is also sufficient.
***Olive oil, canola oil and other oils from plants, nuts, and seeds are the heart-healthiest sources of fat, but animal fats like butter and higher-fat dairy choices can also be part of a healthy diet when used in moderation.
How much protein do I need?
Food sources
of protein include meat, poultry, fish, eggs, soy (including tofu,
soy milk), nuts, legumes, tempeh, milk products, and smaller amounts
in grain products. Here are some examples of protein amounts per
serving:
Meat
and soy meat substitutes: 7 g protein/serving
Dairy
products: 8 g protein/serving
Breads/cereals/grains:
3 g protein/serving
Recommendations
for daily protein intake (male or female):
Fairly
non-active adult - 0.4g protein/lb body weight
Recreational
exerciser* - 0.5 to 0.75g/lb body weight
Competitive
endurance athlete - 0.5 to 0.6g/lb body weight
Competitive
sports which emphasize building muscle mass** - 0.7g protein/lb
body weight
Maximum
usable amount of protein per day for adults - 1.0g/lb body weight
*For
example, a 150 pound recreational exerciser would require about
60 g per day of protein, or the amount contained in 5 ounces meat
or meat substitute, plus 3 servings of dairy products. Additional
protein, over the needed 60 g per day, would be consumed in grain
products.
**For
the athlete whose goal is to build larger quantities of muscle mass
(body builders, football linemen, etc.), food intakes are shifted
upwards in terms of total protein intake. Using the example of a
200 pound body building athlete, with protein needs of 0.7g protein/lb
of body weight, total protein per day = 140 g, or the equivalent
of 11 ounces of meat or meat substitutes, plus 4 servings of dairy,
and 11 bread/grain servings. This may seem like a lot of food, but
remember that 1 slice of bread is a grain serving and 3 ounces of
meat is a protein serving. By spreading out your intake in meals
and snacks throughout the day, you will find that it is fairly easy
to get your protein and other nutrient needs met and stay energized.
Many
athletes, especially those whose goal it is to gain muscle mass
and who are in strength-type sports often hear that "more is
better" when it comes to protein intake. Millions of dollars
each year are spent on special protein supplements, and you may
be eating double portions of entrees at Food Services in an effort
to bulk up. It is a fact that the protein needs of athletes are
higher than the less active person. These needs are easily met,
however, in the average diet of most student-athletes, and extra
protein supplementation is NOT necessary
Protein
eaten in excess of recommendations will be used by the body as a
fuel, as would be carbohydrate. If you take in more protein or carbohydrate
than you need for muscle production or fuel, the body will store
the excess as fat tissue. Some researchers have examined excess
protein intake (more than 4.5 g/lb body weight per day), and are
concerned that there may be possible health concerns with this type
of diet. Some risks include kidney damage, loss of calcium from
bones, dehydration, and an overall unbalanced diet. Athletes who
eat many high protein foods and take protein supplements in addition
may be at risk for some of these health concerns.
Protein
supplements can be a useful add-on to your diet if you are truly
not eating a well-balanced diet. This means including at least 2
main dish type protein foods per day (or 3 if you are male and at
the highest level of training), plus getting several good quality
grain servings and 3 dairy or dairy-substitute products per day.
We recommend eating a well-balanced diet rather than using protein
supplements. They are usually very expensive, and are often recommended
for short-term use only. It is far less costly, and just as fuel-efficient,
to get your protein from the foods and drinks easily available to
you and tastier as well!
An important
physiological fact is that added protein intake alone will not build
muscle. To see an increase in muscle mass, you will need to do strength
training and add extra calories to your diet. These calories should
be mostly in the form of extra carbohydrates, with only small amounts
of additional protein.
How
many carbohydrates do I need?
Food sources of carbohydrates include breads, cereals, rice, pastas,
bagels, fruits, dairy products, dry beans, starchy vegetables (e.g.,
corn, potatoes), candy, fruit drinks/ades, sodas, and baked
desserts.
Here
are some examples of carbohydrate amounts per serving:
Breads,
cereals, grains, "starchy" vegetables
(e.g. corn, peas, lima beans)
Foods
from the meat/meat alternative group and from the fats/lipids group
do not have appreciable amounts of carbohydrates.
Recommendations
for daily carbohydrate intake for most athletes:
Carbohydrates should total around 65% of total energy intake for both
male and female athletes. Note that the recommendations for carbohydrates
given below are calculated differently than the ones for protein.
This is because protein needs are based on the body's need for cell
building and repair, while carbohydrate needs go up directly in
proportion to the athlete's need for additional energy supplies.
Recommended
intake for the all athletes: 3.5 to 5 g/lb body weight
For
1 hour of training per day - 3 to 3.5 g/lb body weight
For
2 hours of training per day - 4 g/lb body weight
For
3 hours of training per day - 5 g/lb body weight
For
4 or more hours of training per day - 6 to 6.5 g/lb body weight
As with
protein, you can easily meet your carbohydrate needs without special
supplements. Two exceptions would be:
Training
at 3 hours per day. If your needs start to approach 5 g of CHO/lb
of body weight per day, you might need to reduce your fat intake
somewhat to make room for the higher amount of carbohydrates your
body needs.
Training
at 4 or more hours per day (e.g., ultraendurance types of events).
You would then need to rely on special carbohydrate supplements,
as well as eating a very high carbohydrate diet.
Carbohydrate
is really the "key player" of all the nutrients for your
sports nutrition power plate, whether you are a serious athlete
or are just ramping up your activity level. They are essential as
the most immediate and efficient fuel to the muscles. Carbohydrates
also function to spare the body's having to use protein as a fuel
source. In its circulating form in the blood, carbohydrate is called
glucose, and its storage form in muscles and in the liver is called
glycogen.
When
you first begin to exercise, your body draws on the circulating
glucose as its first source of energy. If you haven't eaten in a
long time, your glucose levels are likely to be low (you've probably
heard the term low blood sugar). If you are an early morning exerciser
and go out for a long run before eating, this can be a real problem.
You may have trouble completing the run at full speed, or have real
trouble focusing well in morning classes, even if you do eat after
exercising. Many morning athletes find that taking in some juice
or water and a plain piece of bread before exercising can help solve
this problem.
Glycogen,
as the storage carbohydrate, kicks in when circulating glucose drops
to a lower level. Although the body cannot store large amounts of
glycogen, you can help increase these stores by replacing the carbohydrates
(either liquid or solid form is fine) in your body immediately after
exercising, especially within the first half hour. Good examples
would be: cranberry juice and fig newtons, high carb sports drink
and pretzels, a bowl of cereal with low fat milk and banana, or
a bagel with jam and fruit juice. Exercised muscle fibers are the
most ready to take up carbohydrate, as they have just been worked,
and will easily store an increased level of glycogen, helping you
be "pumped up" even more for your next workout!
Without
enough carbohydrates, your performance as an athlete will be seriously
impacted. Some of the current low carb diets emphasize eating a
limited amount of carbohydrate, not even adequate for most students,
whether or not they are active in sports. As an athlete following
this type of diet, you would find that your energy levels would
be chronically drained.
How
much fat should I be eating?
Food sources of fats, also called lipids, include oils from plants
(especially healthy are the oils from olives, nuts, seeds, and peanuts),
animal fats and fish oils, higher fat dairy products, salad dressings,
and baked products/desserts.
Recommendations
for daily fat intake:
Your total fat (emphasizing healthy fat/lipid choices) should be
in the range of 20% to 35% of your total energy intake per day. Specific
levels for each athlete will vary, depending upon your overall energy
requirements. Athletes participating in sports that require a higher
energy intake (e.g., distance runners, rowers, professional cyclists)
will need more total fat in their diet to get their energy needs
met.
Fat plays
many important roles in your body. Some of the main reasons that
it is very important to get the recommended levels of healthy types
of fats and lipids in your diet daily are because fat:
Protects
your internal organs from trauma
Is
essential for you to absorb the fat-soluble vitamins (A, D, E
and K) from your diet
Is
necessary to help your body manufacture hormones, including the
estrogen essential to help women maintain their menstrual cycle
(without which they begin to lose calcium from their bones, often
resulting in stress fractures and the risk of permanent loss of
bone density
Is
a vital part of nerve cells
Maintains
healthy skin and shiny hair
Provides
a necessary energy source hard to find in protein and carbohydrates
(gives you over twice the energy per gram)
Helps
your meals taste better, and keeps you feeling satisfied longer
between times of eating
Contains
the mono- and polyunsaturated fatty acids necessary for good health,
especially protection from heart disease and some cancers
Some
athletes, especially in an effort to maintain a lower body weight
(e.g., those in sports that emphasize appearance or require a weight
class -- gymnastics, diving, wrestling, and figure skating) sometimes
restrict their intake of dietary fat to unhealthy levels, occasionally
far below the minimum recommended 20% of total calories per day.
This can lead to nutritional imbalance in your diet, forcing you
to take in most of your energy from carbohydrates and protein. If
you stay on a fat-restricted diet for an extended period of time,
your body can begin to suffer physiological consequences such as
fat soluble vitamin deficiency disorders, loss of skin tone and
hair health, poor quality of membranes necessary in the nervous
system, and loss of the menstrual cycle. It can also increase the severity of mood disorders like anxiety and depression.
No other
nutrient can provide what fat can! It is also not uncommon for someone
who is restricting fat to be also limiting whole categories of important
foods (dairy, meats or fish, grains, etc.). This leads to other
nutritional imbalances, and a further erosion of health, not to
mention the ability to perform well as an athlete. Female athletes
who restrict fat too severely, along with a high level of training,
often lose their periods. Because estrogen levels are too low in
the body, calcium begins to be lost from the skeletal frame, and
the woman can develop what is known as the Female
Athlete Triad (the concurrent presence of disordered
eating, lack of menstrual periods, called amenorrhea,
and bone weakening, or osteoporosis). If you think this describes
your situation, it is very important that you consult with a medical
provider, in order to treat this condition. New guidelines from the NCAA reinforce the importance of addressing this issue.( “Amenorrhea is common in athletes, but it is not normal or healthy.” – NCAA document: Managing the Female Athlete Triad.) If you are in this state
for a long period of time, the impaired mobility, chronic pain,
and occasional deformity caused by severe bone loss can last a lifetime.
Some
research done in the late 1990s indicated that endurance athletes
might benefit from a higher fat diet, to spare carbohydrate stores
from being used up early on in a long event. Although some athletes
have begun to use this type of dietary pattern when training for
endurance events, the results have not been proven to be entirely
satisfactory. In addition, you should keep in mind that long term
use of a high fat diet is known to be linked with higher levels
of blood lipids, a risk factor for heart disease.
How
much calcium do I need?
Food
sources of calcium include milk and milk products, calcium-fortified
milk substitutes (e.g., soy-based), calcium-fortified orange juice,
tofu packed in calcium brine, canned fish with bones, almonds, broccoli
and dark green leafy vegetables, fortified cereals (check labels),
coffee lattes, mochas, cappuccinos, etc., calcium supplements.
Recommendations
for daily calcium intake:
Young adult men and women need around 1200mg of calcium per day,
which is the equivalent of about 4 servings of dairy products. After
you are in you are in your mid-20's, your needs drop to around 1000mg/day.
During pregnancy and breastfeeding, and after menopause, women's
needs rise to around 1500mg. Female athletes diagnosed with amenorrhea may be encouraged to consume 1500mg/day until their menses are restored.
By your
mid-20's, your bones will have reached their "peak bone mass."
You have this last window of opportunity to get as much calcium
into your skeletal frame as you can. Three servings of dairy products
per day would only get you to about 900 mg, and for many students,
even getting that much is a challenge. If you can get your intake
up to 4 servings, you're doing just fine! If you are in the range
of 3, but are consuming a lot of calcium-fortified foods and/or
are taking a calcium supplement (available in the Brown Health Services
pharmacy on the 2nd floor), your bones are thanking you. Anything
lower than that means you need to start thinking about calcium NOW
- to prevent problems of stress fractures and osteopenia (loss of
bone tissue, which can eventually lead to osteoporosis, a more serious
condition, and often irreversible).
If you
are avoiding dairy products because you think they are "fattening,"
you can go with the low fat versions. If you have lactose intolerance
you can easily find lactose-free versions of milk in Brown's Food
Services. You can also purchase low lactose milk and other dairy
products in local markets. Try taking a lactase enzyme tablet or
two (available in local pharmacies) right before eating a regular
dairy product, to ease digestion. No need to miss out on late night
pizza parties!
"Weight
bearing exercise" (e.g., walking, running, tennis, soccer,
basketball and especially strength training with weights) also contributes
to a strong skeletal structure, but cannot make up for a poor calcium
intake, which only you can provide.
There
are several myths that seem to keep circulating about milk's effects
on athletic performance. Nancy Clark, Boston area sports nutritionist
and consultant for pro and amateur athletes, writes about some of
these "Milk Myths" in her book Nancy Clark's Sports
Nutrition Handbook (available for loan from the Health Education
library):
Drinking
too much milk leads to calcium deposits - For most healthy people,
this is not true. If you take in more calcium than your body needs,
you will simply excrete it.
Milk
causes "cotton mouth" - Again, this has not been shown.
This feeling in the mouth or throat is usually caused by not getting
enough fluid before exercising, or by being nervous or anxious
before a competitive event.
Milk
is hard to digest and will cause cramping and bloating - Milk
and yogurt are actually very soothing and easy to digest, unless
you are lactose intolerant. If you are, there are many lower lactose
and non-lactose alternatives available.
Drinking
more milk than normal recommendations will speed healing of fractures
- Unfortunately, this is not true. Continue with your healthy,
balanced diet, have patience, and set up a good plan of rehabilitation
from your physician and/or trainer. Six to 8 weeks is usually
the time frame for most fractures to heal.
Am
I getting enough iron?
Iron transports oxygen and manufactures hemoglobin, which are both
vital in maintaining energy and good health.
Food
sources of iron include meat (especially red meats), poultry, fish,
egg yolks, iron-fortified cereals, breads and other grains, legumes,
nuts and seeds, dark green leafy vegetables, and dried fruits.
Recommendations
for daily iron intake:
Women: 18 mg/day
Men: 8 mg/day
Many students, especially women, have a diet that is too low in
iron. The most frequent cause is the elimination of red meat from
the diet, and for women, the monthly loss of iron in the menstrual
period. Even though iron can be found in other food sources, the
"heme" form found in the muscle of red meats in particular
(and to a lesser extent poultry and some fish) contains the highest
concentration of the form best absorbed by your body. It is usually
recommended that vegetarians take in even higher than the above
recommended levels of iron in their diets, because iron is not absorbed
as well from plant sources as it is from animal sources. If you
have eliminated red meat and/or are a vegetarian, it is recommended
that you take a 100% RDA-level multiple vitamin and mineral supplement
that contains 100% of the daily requirements for iron (a generic
supplement of this type is sold in the Brown Health Services pharmacy). Note: Hemochromatosis is a genetic disorder predisposing individuals to a toxic build-up of iron. Because iron supplementation may accelerate the effects of this condition, adult men should avoid taking supplements that include iron.
When
your blood is too low in iron, this is called iron deficiency anemia.
As an athlete, when you become anemic, you usually have a lot less
energy as you participate in your sport or activity. The reason
for this is because an important function of iron in the body is
to form substances in the muscle that help bind oxygen, necessary
for the muscle to perform for you. In addition, iron helps to manufacture
enzymes that help with the energy-making process.
Athletes
are sometimes more likely to develop anemia than less active students.
This is because iron is lost in sweat, urine, and feces, as well
as in small breakdowns in tissue that occur in the pounding of feet
in long distance running and other surface contact. If your eating
patterns don't replace these iron losses (e.g., if you are restricting
calories, you don't eat meat, fish, or poultry, and aren't careful
to eat high iron alternative sources), you could be at risk for
developing iron deficiency anemia. Periodic testing of iron status
is often recommended for athletes. You may want to ask your coach
or medical provider about this if you have been experiencing fatigue
and/or think your iron intakes have been low. A long-term deficiency
in iron can markedly affect your performance as an athlete, and
if you have developed anemia, the earlier you start treatment the
faster you can be back at your peak level of performance. Although
iron deficiency anemia is usually not considered a serious illness,
full recovery can take from 6 to 9 months. Prevention is certainly
preferable to treatment!
What
about other vitamins and minerals?
Many other vitamins and minerals play very important roles in the
diet of an athlete. To date, research has not shown any direct benefit
or enhanced performance results from taking added supplements of
any specific vitamin or mineral, no matter the size of the athlete
or the chosen sport. Even the potassium and sodium losses experienced
by athletes who sweat on a hot day or in a long event can easily
be met by drinking fluids and eating a normal diet, since these
electrolytes are so widely available in foods. Any athlete or active
student can meet the needs for these nutrients by consuming a sports-healthy
diet, following the guidelines discussed in this section. However,
it is suggested that most people take a daily needs level multiple
vitamin and mineral supplement every day. This shouldn't replace
eating a healthy diet but will help to insure that your daily vitamin
and mineral needs are met.
Do
special supplements help me put on muscle or perform better?
Many athletes, from high school sports through the pro level, have
come to believe that taking some type of supplement, varying from
protein shakes touted to build muscle mass to the more controversial
steroid-related products, will give them an edge in their athletic
endeavors. You may have been encouraged to try some of these supplements
by friends, magazine or web site ads, or coaches and trainers. Many
of these products are advertised as "natural" and therefore
appear to be safe. Unfortunately, there is little guarantee of the
safety or even the efficacy of what you are getting. Under heavy
lobbying from the supplement industry, a federal law was passed
in 1994 that pulled dietary supplements from under the Food and
Drug Administration's regulatory authority. This included all vitamins,
minerals, amino acids, herbs, and other botanicals. It is therefore
practically impossible for you to know, as a consumer, whether what
you purchase as a supplement is safe, will do what it says it does,
or even contains in the bottle what it claims to have.
When
you look on web sites or read articles to do your own research,
always beware of studies done by companies or individuals selling
products. Look for scientific studies published in reputable journals,
not just anecdotal stories. Also be sure the studies were done on
humans and not animals - results are not always the same on different
species.
If you
are a competitive athlete, know that many substances contained in
supplements have been banned by the NCAA (National Collegiate Athletic
Association) and/or the IOC (International Olympic Committee). You
can be eliminated from competition if you are found to have taken
these substances, even if you were not aware that the supplement
you consumed contained that substance. You can go to the web site
of the NCAA
to look for lists of banned substances.
Amino
Acids - Amino acids, the building blocks of protein, are claimed
to increase muscle mass, decrease body fat, and increase growth
hormone secretion. Recommendations: Large intakes of single amino
acids may interfere with absorption of protein, cause intestinal
upset and metabolic imbalances. You are better off consuming recommended
levels of protein foods as stated above.
Androstenedione
- This drug became well known after several baseball players used
it during record-setting home run seasons. This chemical, which
is present in the body naturally, is technically a steroid. Its
action does increase muscle mass. Proponents of "andro"
claim that since it occurs naturally, it should be a legal anabolic
steroid. Its manufactured form, which has been around since being
synthesized in the 1930s, is legal, but has been banned by the NCAA,
the IOC, the U.S. Olympic Committee, the National Football League,
and the Association of Tennis Professionals. Recommendations: Because
no safety data are published, and andro is known to raise testosterone
levels in users, just as with illegal steroid users, some of the
same unhealthy side effects could result. You would be wise to stay
away from this supplement.
Chromium
Picolinate (CrPl) - Claims for this supplement are that it increases
muscle mass, is a safe alternate to anabolic steroids, decreases
body fat, and increases insulin sensitivity. Both chromium and picolinic
acid do function in the pathways in the body that help with energy
metabolism and insulin function. The original studies supporting
these claims were poorly designed, and further studies have not
backed up the earlier results. The Federal Trade Commission has
been able to stop some of the false claims about CrPl's ability
to cause weight loss and loss of body fat. Recommendations: Because
athletes lose chromium through increased urine losses, they should
be sure to include a wide variety of foods in their diet. Since
chromium is widely available in many foods, special supplements
are not necessary.
Creatine
- Creatine, along with phosphate, occurs in the body naturally as
a very important component of your energy metabolism system. Research
has shown that the effects of supplements of combined creatine phosphate
are due to increased muscle mass, making this supplement especially
useful for athletes who are involved in "short burst"
activities, such as lifting heavy weights, making tackles as a football
lineman, etc. Creatine has been found to have no benefit for endurance
athletes. Some anecdotal reports have linked creatine usage with
muscle cramping, muscle and tendon pulls, and slower injury recovery,
but research does not back up these claims. Recommendations: Because
there is still no long-term data available on the safety of creatine,
young athletes should be especially careful about using of this
supplement in high doses and over longer periods of time. If you
have decided to use creatine, the current dosage recommendations
are to complete a loading phase of 20 to 25 g per day for 5 to 7
days, then a maintenance phase of 5 g per day. It is thought that
it takes about 4 weeks to completely eliminate creatine from your
system, once you have stopped taking it.
Ephedra/Ephedrine
(Ma Huang) - Claims for ephedra are that it improves athletic
performance and will promote weight loss. Ephedra has been used
in Chinese medicine practices for thousands of years. It was first
used commonly in this country as an ingredient on many nasal decongestants
and cold medicines. A few years ago, it showed up as an ingredient
of many non-prescription weight loss pills. A direct effect of ephedra
is to raise one's heart rate, because it is a stimulant. It does
not increase your energy as an athlete. There were very serious
consequences in some individuals, and several deaths were linked
to the use of ephedra, until the U.S. government finally pulled
all substances containing ephedra from the shelves. If you see a
product containing ephedra, know that it NOT effective for weight
loss or athletic performance enhancement, and it could be very dangerous
to take, especially in combination with other, even something as
benign as caffeine!
Herbs
claimed to be "natural anabolic agents" that build
muscle (e.g., yohimbe, smilax, tribulus, wild yams, and gamma oryzanol):
The body is unable to convert these herbs into testosterone or other
anabolic steroids, and they do not increase muscle mass. Ginseng
is an herb historically used for Chinese medicinal practices. Current
research does not back up earlier studies that claimed that ginseng
enhanced exercise performance.
Protein
powders and other protein supplements - See a discussion of
protein as a nutrition supplement above.
(Adapted
from Sports Nutrition, 3rd Ed., C.A. Rosenbloom, The American Dietetic
Assn., 2000)
How
should I eat before I compete or exercise?
Many athletes think of a "pre-game meal," but how you
eat all the time is the most important way you can prepare your
body nutritionally to perform at its peak. It is impossible to make
up for skimping on meals and snacks during the week by eating one
super meal on game day. Your muscles and endurance level can't be
fooled that easily, and you'll "hit the wall" far earlier
than if you had been powering all along.
As a
general rule, your ongoing eating patterns should be high in good
quality complex carbohydrates (as opposed to simple, sugary carbos),
and moderate in both protein and fat. If you are using the Food
Guide Pyramid to help you look at your eating patterns,
you will find this a good place to start planning meals and menus
as an athlete as well. Refer to other sections of this page for
more information on good sources of carbohydrates, proteins, and
fats.
You will
usually find that your energy will remain highest during a competition
or exercise routine if you have eaten a light meal or snack about
2 or 3 hours prior to exercising. This allows your body to have
some available energy in the form of circulating glucose, without
having too much food in the stomach to slow you down or feel uncomfortable.
This small meal or snack should be mostly carbohydrate, could have
some protein, to let it stay with you a little longer, and should
be very low in fat, to allow your stomach to digest this food quickly.
Some examples of pre-exercise snacks could be:
Yogurt
with graham crackers
Bowl
of cereal with low-fat milk
Low-fat
granola bar
Fig
newtons and a glass of low-fat milk
Bagel
with slice of low-fat cheese
Fruit
smoothie made with non-fat yogurt
Oatmeal
made with raisins and low-fat milk
If you
are timing full meals on the day of your competition, you can usually
figure that it will take about 4 to 5 hours for complete digestion
of a normal sized meal. Some athletes find that they are more nervous
before competing, and the anxiety usually slows the digestive process.
Allowing more time before exercising, eating a lower fat meal, doing
relaxation techniques, or even trying liquid meals (fruit smoothie
with blended low-fat yogurt and fruit; Instant Breakfast made with
non-fat milk) have all been techniques that have helped athletes
with nerves.
If you
are trying something new with your eating regime, it's not a good
idea to wait until the day of competition to experiment. You could
upset your digestive system and have even bigger problems than too
much food in the stomach!
If you
are competing in an event that is early in the morning, then you
will need to depend heavily on the last meal and snacks you have
the evening before as your "pre-game" meal. Again, try
to eat foods that are high carbohydrate, moderate protein and fat.
You should also try to have a light high carbohydrate snack as soon
as you can after you get up on the morning of competition. A bowl
of cold cereal with some dried fruit and a small amount of non-fat
milk may be enough to get you through an early morning event. You
can always add more calories later in the morning.
The biggest
challenge for many athletes are events that are scheduled off and
on throughout a day, or endurance events that last for more than
an hour. It is extremely important to be well fueled for the days
leading up to the event. If you are competing in a marathon or other
intense, endurance event lasting longer than 90 minutes, you may
benefit from what is known as carbohydrate loading. This involves
a tapering off of exercise in the week before the event, while at
the same time increasing the amount of carbohydrates you are taking
in. This enables the body to store additional glycogen for available
energy during the event. Some athletes who are participating in
long cycling or running events find that the gel form of carbohydrates
are a convenient and lightweight, although expensive, way to get
quickly energized without losing time in an event. Remember to drink
plenty of water along with these concentrated forms of carbohydrates!
For sports
such as tennis and wrestling matches and other events that may stop
and start throughout a day, you want to be sure that you have started
the day well-fueled and hydrated (more on fluids below). As each
event ends in the day, be sure to take some easily digested high
carbohydrate food and/or drink (juice, crackers, low-fat cookies,
bagels, fruit and dried fruit, low-fat cereal bars, etc.). If you
have 2 or more hours between events, you have time to add some protein
to your snacks and meals (e.g., a small lean turkey sandwich without
mayo, yogurt, glass of low-fat milk, or low-fat cheese).
Does
it matter what I eat after I exercise?
Actually this is probably the most important time to pay attention
to what you eat, even though many athletes don't think too much
about the "post-game" meal. How many times after a game
have you and your team just piled into a restaurant and loaded up
on burgers and fries, or celebrated with pizza and your favorite
drinks? You may not realize it, but what you are putting into your
body and feeding your muscles within the first 30 minutes to 2 hours
after you work out or compete can make a very big difference on
your performance the next time you go out to power up. Paying attention
to immediate replacement of carbohydrates is especially important
because they build glycogen, the storage fuel for your muscles.
Right after working your muscles, they are most able to store even
more glycogen than they had before your workout. This helps to prevent
chronic fatigue and acute burnout that some athletes experience
who are consuming a diet that is routinely lower in energy and carbohydrates
than their exercise levels demand.
You should
try to eat or drink about 0.5 g carbohydrate/pound body weight after
exercise or competition, and again within 2 hours. Examples would
be about 100 g carbohydrate for a 200 lb athlete or 65 g for a 130
lb exerciser. This is particularly important if your workouts are
strenuous and/or last over a few hours per day.
Here
are some examples of average carbohydrate content of common foods.
You can check labels of your favorite foods to get an idea of carbohydrate
content in grams.
40
- 45g of Carbohydrates
50-60g
of Carbohydrates
4
graham crackers
11
oz. GatorPro
4
fig newtons
2
cups (16oz.) apple or orange juice
1
Power Bar
8
oz. sherbet
12
oz. can soda
2
cups applesauce
1
cup cranberry juice cocktail
1
cup chocolate pudding
1
baked potato with skin
30
animal crackers
3
oz. pretzels
3
large matzoh boards
20
saltine crackers
2
bananas
6
cups popcorn (any kind)
8
fig newtons
1
cup rice (any kind)
2
large fruit or bran muffins
1
large flour tortilla
1/2
10" thin crust pizza (any kind)
2
hamburger buns
1
cup granola (any kind)
16
oz. PowerAde
2
cups pasta or mashed potatoes
22
oz. Gatorade
3
oz. box of raisins
8
graham crackers, 2-1/2" squares
12
graham crackers, 2-1/2" squares
3
slices of bread (any kind)
4
slices of bread (any kind)
Research
in the late 1990s has shown that some protein, in addition to the
recommended carbohydrate intake after exercise, can also contribute
to your body's increasing its stores of glycogen for future workout
needs. The combination of nutrients can also contribute to muscle
synthesis, but even athletes focusing on strength training and body
building do not need to overload on extra protein. Refer to the
earlier section on protein to learn more.
Is
there a way to know how much water or fluid I need as an athlete?
Staying hydrated during your workouts and competition can make an
enormous difference on both how you feel as well as how well you
actually execute your sport. Yet ignoring hydration needs is one
of the most common errors athletes often make in their training
regimens. Water is important for many functions in your body, including
cushioning your joints and muscles, regulating your body temperature
(extremely important for you as an athlete!), bringing all the nutrients
to your cells, and removing waste products from the body.
Some
guidelines from the American Dietetic Association for assessing
your needs for water, depending on your weight and activity:
If you weigh 110 pounds and bike for an hour, you should drink
8 cups of water (standard recommendation for daily intake for
most people) more than 1 additional cup for a total of 9 cups
for the day.
If
you weigh 125 pounds and participate in a 1 hour aerobics class,
you should drink 8 cups of water plus 2 additional cups for a
total of 10 cups of water for the day.
If
you weigh 150 pounds and run for an hour, you should drink 8 cups
of water plus 4 more cups, for a total of 12 cups of water for
the day.
If
you weigh 200 pounds and lift weights in a hot training room for
an hour, you should drink 8 cups of water plus 6 more cups, for
a total of 14 cups of water for the day.
To stay
well hydrated well-hydrated before, during and after exercise or
competition, Ellen Coleman, sports nutritionist, recommends these
guidelines in her book, The Ultimate Sports Nutrition Guidebook,
1996 (available for loan from the Health Education library):
8
to 16 ounces 15 minutes before exercising
4
to 8 ounces every 15 minutes during exercise.
16
ounces for every pound of body weight lost after exercise.
It is
recommended that you occasionally weigh yourself before and after
a workout to see how much weight you have lost. This will be fluid
loss, and you can figure that for every pound lost, you will need
to replace that with 2 cups, or 16 ounces, of water.
You cannot
depend on feeling thirsty to know when your body needs water. By
the time you notice that you are thirsty, you have lost about 1%
of your body weight. A 2% loss of body weight in fluid can actually
decrease your performance by 10 to 15%! It is important to get in
the habit of increasing your fluid intake routinely if you are active,
not just on competition days. During extreme conditions (either
hot OR cold weather and at high altitudes), your intake should increase
even more, because your body is working harder. Water is usually
the best fluid to use for fluid replacement, but if you are involved
in an "all day" activity, you should consider a commercial
sports drink that has carbohydrate added. A less expensive alternative
is to dilute any fruit juice by about half with water. Try drinking
your fluid when it is cool, but not too cold - it will leave the
stomach more quickly and get into your system at this temperature.
Keep
in mind that some juices, high water content fruits (e.g., watermelon,
berries, and peaches), and non-caffeinated drinks can substitute
for some of your water. Generally it is recommended that at least
half of your water needs be met by plain water to spare your kidneys
from having to filter out too many extra substances. You can increase
your water intake by getting in the habit of always having a glass
of water with meals, in addition to low-fat milk and/or juice. You
can also carry a bottle of water in your backpack, take water breaks
instead of coffee breaks, alternate sparkling waters with other
beverages at parties, and drink before, during, and after any physical
activity. Also remember than caffeine and alcohol dehydrate you
and increase your fluid needs.
Can I be a vegetarian and still be a
powerful athlete?
Absolutely! Many collegiate and Olympic records are held by athletes
who are vegetarians. There are some nutritional challenges, however,
if you are a vegetarian and are physically active. It is sometimes
difficult to take in enough calories while eating a vegetarian diet,
naturally high in fiber and therefore very filling. You may need
to be sure that you are not filling up quickly on large salads that
give you "bulk" without the energy you need. You may need
to eat many small, high-energy, nutrient-rich meals and snacks throughout
the day and evening in order to satisfy your body's need to fuel
up for the energy demands of your sport.
A specific
nutrient that your diet may not supply enough of is protein. This
may be especially true if you are female and have been limiting
your calories to reduce extra body fat for a sport that demands
a limited weight or expects a certain physical form (e.g., gymnastics,
diving, crew coxswain). Good protein choices to look for as a vegetarian
would be nuts and seeds, peanut butter, soy products, tofu, garden
burgers, legume-based soups, and any dairy products. It is also
important to remember to keep your proteins varied throughout the
day, to ensure that you are getting a mixture of the essential amino
acids you need for the building blocks of protein you are creating
for muscle, all cells and tissue.
Vegetarian
athletes usually take in adequate amounts of carbohydrate, because
they consume large amounts of grains, cereals, fruits, starchy vegetables,
nuts, and seeds.
Calcium
can be a nutrient that is not eaten in adequate amounts in the diet
of vegetarians, especially female athletes, who are prone to stress
fractures and shin splints, and may not be having regular menstrual
periods because of heavy training. If you are not a vegan, be sure
you are getting at least 4 servings of dairy products/day (also
a super source of protein!), or 3 servings and a good calcium supplement.
Because
vegetarians have eliminated red meats and poultry, the best sources
of "heme" iron (the most easily absorbed form of iron
in their diets), iron is often low in the diets of vegetarians.
For athletes this is a special concern because anemia is more common.
To learn more about this anemia of athletes, refer to the section
of this page on iron.
If you
are a vegan type of vegetarian, who eats no type of animal product
(and therefore have eliminated dairy products, eggs, and fish from
your diet as well as red meats and poultry), your diet may be lacking
in vitamin B12. Be sure that you take either a multiple vitamin
and mineral supplement daily (a good idea for most people) and/or
drink a soy based milk substitute that has been fortified with vitamin
B12.
The more
varied your diet is, the more likely you are to have a nutritious,
well-balanced diet that includes all the vitamins and minerals and
other nutrients that you need to keep at the top of your sport.
This is especially important for vegetarians, who sometimes get
in a rut with their eating patterns. If you are eating on meal plan
at Brown, and find yourself always heading for the same items at
the Ratty or the V-Dub, try to think a little more creatively at
meals. See how you can combine things from the salad bar with the
good homemade breads, grains and soups, and try some of the vegetarian
dishes that you may not have tasted before. Keep expanding your
palate! You may find new things you can add to your list of favorite
foods.
You may
also want to ask yourself the reasons why you made the choice to
become a vegetarian in the first place. Be honest. Some athletes,
and others, find a vegetarian diet and lifestyle an easy way to
manage weight. While there is nothing inherently unhealthy with
being a vegetarian, and there are many health considerations to
recommend this style of eating, for a few people this eating pattern
can be a stepping stone to more serious eating concerns. It can
be easy to increasingly limit one's diet all for the sake of "healthy
eating," and then find one or more of the following events
are occurring:
Weight
has dropped to an unhealthy level,
Athletic
performance has fallen off,
Sports
injuries are increasing,
For
female athletes, menstrual cycles have become irregular or ceased
altogether, and/or
General
fatigue and/or anemia is noted.
Eating
concerns can easily turn into a more serious eating disorder, and
can happen to and female athletes. If you think this is a problem
for a friend or teammate, you have many Resources
at Brown to which you can turn. You may also want to
check out our web pages that deal with eating
concerns.
For more
detailed information about vegetarian eating and nutrition suggestions,
click on Being a Vegetarian.
When
does "enough" exercise become "too much" exercise?
If you are working out in the exercise rooms in the OMAC or the
Bear's Lair, you may have noticed from time to time certain students
who always seem to be there, no matter what time or day of night
you show up. Perhaps you have even made lighthearted comments to
them about the amount of time they seemed to be devoting to their
fitness regimens. They probably do not view their workout schedules
as anything excessive, even though they may have been coming to
the gym over an hour at a time, two times a day, every day. Their
rationale may have been that they just wanted to "stay fit/healthy,"
or that they were "in training." Even athletes who are
training for the Olympics know the importance of giving themselves
a day off every week for muscles and ligaments to rest.
Warning
signs that someone is exercising excessively include:
Rigid
rules about exercising,
Anxiousness
or restlessness if s/he doesn't follow a usual activity schedule,
Working
out more than a coach or athletic trainer recommends,
Eating
patterns that are rigid or calculated to exactly match the calories
expended on exercise.
All
of these behaviors are strong indicators that good intentions for
a healthy lifestyle may have gone too far. This person may well
be at risk for a sports injury, an eating disorder, or other serious
health problems, not to mention the potential for social isolation
that this type of heavy training schedule usually brings on.
You may
be questioning how to best approach someone you are worried about.
Usually it is not recommended that you focus directly on how much
this person is exercising or how little s/he is eating. This usually
puts the person on the defensive and may drive a wedge between the
two of you. Keep your comments as statements from your own perspective
("I" statements, vs. "you" statements). An example
could be, "I've noticed that you look pretty wiped out after
some of these long workouts. I'm concerned. Are you OK? Want to
go for a cup of tea when we leave the OMAC?" You may not get
a direct or positive response after your first effort, but your
words will be heard, and s/he will know that someone cares and has
reached out. Sometimes your voice will be the one that will make
the difference, and enable a person who has felt completely alone
to begin to feel that there is someone who is there for her/him.
You can also be ready to offer information about some of the resources
Brown has to offer students who might want to talk about patterns
of compulsive exercise and/or eating concerns. Click on Resources
at Brown, and Worried
About a Friend's Eating to learn more.
Located on the third floor of Health Services.
Confidential information is available through individual appointments
or phone consultation with a Nutritionist to discuss the many types
of sports nutrition, general nutrition, and/or eating concerns you
may have regarding yourself, a friend, roommate or teammate. Health
Education also offers workshops, pamphlets, and reading materials
covering these and related issues. There are no fees for Health
Education services.
Located at the corner of Brown and Charlesfield streets.
Confidential information and care is available on a walk-in, or
by scheduled appointment basis. Care is available for initial, current
or past disordered eating patients. There are no fees for medical
care at Health Services. However, there may be fees incurred if
laboratory tests, medications, specialist or emergency hospital
care is needed.
Located on the fifth floor of J. Walter Wilson.
Confidential appointments are available at Psychological Services
for students concerned about their eating issues. Guidance is also
available for those who are concerned about a friend, roommate,
or teammates' eating. Services include crisis intervention, short-term
psychotherapy and referrals. There are no fees for appointments
at Psychological Services.
Olney-Margolies
Athletic Center ("OMAC") 401.863-3537
Includes basketball and volleyball courts, indoor running track,
cardio and cybex equipment, weight room, and aerobic studio. Call
for information on hours available to students.
Smith
Swim Center 401.863-3014
Includes pool, locker room, shower and sauna, and squash courts.
Call for information on open swim hours.
Meehan
Auditorium 401.863-2236
Available for recreational ice skating. Figure skating, speed skating,
pairs skating, and jumps are not allowed during open university
skating hours. Call for more information.
Position of the American Dietetic Association, Dietitians of Canada,
and the American College of Sports Medicine, 2000. Very detailed
and complete position paper of these three leading organizations
in the field of sports nutrition, emphasizing that physical activity,
athletic performance, and recovery from exercise are enhanced by
optimal nutrition. The position paper reviews the current scientific
data related to the energy needs of athletes, assessment of body
composition, strategies for weight change, the nutrient and fluid
needs of athletes, special nutrient needs during training, the use
of supplements and nutritional ergogenic aids, and the nutrition
recommendations for vegetarian athletes.
Sports, Cardiovascular and Wellness Nutritionists. A Practice Group
of the American Dietetic Association. This web site provides reliable
information for the athlete on a variety of sports nutrition topics
(as well as links to learning more about eating disorders and cardiovascular
nutrition). Although the web site is also a resource for nutrition
professionals belonging to this practice group, there is much useful
information available to non-A.D.A. members as well.
Go to the Sports Science Center on this site for articles by experts
in exercise science and sports nutrition. Topics include supplements,
hydration and sports psychology.
The Personal Health section of this website has information on fitness,
nutrition, strengthening exercises, weight control and women's health.
Articles from the ADA on eating disorders, including The Female
Athlete, Compulsive Exercise and Anorexia.
Choose to Move is a 12-week interactive physical activity program
with weekly goals, an online newsletter and nutrition tips.
Extensive information on healthy ways to get fit, including articles
on components of an exercise program, starting a fitness program,
frequently asked questions and a body mass index calculator.
Disclaimer: Health Education is part of Health Services at Brown University. Health Education maintains this site as a resource for Brown students. This site is not intended to replace consultation with your medical providers. No site can replace real conversation. Health Education offers no endorsement of and assumes no liability for the currency, accuracy, or availability of the information on the sites we link to or the care provided by the resources listed. Health Services staff are available to treat and give medical advice to Brown University students only. If you are not a Brown student, but are in need of medical assistance please call your own health care provider or in case of an emergency, dial 911. Please contact us if you have comments, questions or suggestions.