Young Men's Health

Sports and Nutrition - Fueling Your Performance


Just as a car runs best with a full tank of gas, your body needs the right kind of "nutritional fuel". A balance of carbohydrates, proteins, fats, minerals, vitamins, and water will give your body what it needs for peak performance.


Carbohydrates or "carbs" (found in pasta, bread, cereal, rice, potatoes, fruit, milk, yogurt, etc.) are especially important for athletes because they supply the body with glucose for energy. Extra glucose is stored in the muscles and liver as glycogen, your energy reserve. During short bursts of exercise such as sprinting, basketball, gymnastics, or soccer, your body relies on glycogen to keep your blood sugar levels stable and thus maintain your energy. If you don't have enough glycogen, you may feel very tired or have difficulty sustaining the activity - effects that will, undoubtedly, impact your performance! During longer exercise, your body uses your glycogen stores first, next turning to fats stored in your body to fuel performance.


Fat is an important source of energy used to fuel longer exercise and endurance activities, such as hiking, cycling, and long-distance running. Eating a diet that is too low in dietary fat may decrease athletic performance and cause other health problems, such as deficiencies of certain vitamins which require fat to be absorbed.


Protein is needed for your body to build and repair muscles. Small amounts of protein may also be used for energy.


Vitamins and minerals are not sources of energy, but they have many important functions in the body. For example, vitamin D and calcium are needed for strong bones, and iron is needed for blood cells to carry oxygen throughout your body. Certain minerals, like potassium, calcium, and sodium are called electrolytes. They are important during exercise because they have an effect on the amount of water in your body and on how your muscles work. Athletes should eat a balanced diet with a variety of foods to make sure they get enough vitamins and minerals. It is fine to take a regular multivitamin, but supplements with high doses of vitamins and minerals do not improve performance and may actually be harmful.


Water is essential to keep you hydrated. Dehydration (when your body doesn't have enough fluids to work efficiently) can cause muscle cramps, and dizziness or lightheadedness. When you are physically active, dehydration is not only dangerous, but can also keep you from performing your best.


Healthy Eating Tips for Athletes:

What fluids should I drink and how much do I need?

Before exercise: The goal of drinking fluids before exercise is to be well hydrated before you are physically active. Different people need different amounts of water before they exercise depending on a wide variety of factors, including their weight, how much they sweat before exercising, and how much they've eaten. In general, teens should drink 2-2.5 cups of water or sports drink at least four hours before physical activity; they should then drink 1-1.5 cups of water 10-15 minutes before the activity.


During exercise: Fluid needs during exercise depend on how intense and long your workout is, weather conditions, and how much you sweat. If you will be exercising for less than 60 minutes, drink ½-1 cup of water every 15-20 minutes during your workout. If you are going to be exercising for more than one hour, it is recommended that you drink ½ -1 cup of a sports drink every 15-20 minutes. Sports drinks, such as Gatorade® or Powerade®, help replace water, carbs, and electrolytes. Avoid sodas and drinks that contain caffeine because they can actually dehydrate you.


After exercise: Calorie-containing drinks (such as juice or a sports drink) can replace water and glucose. You can figure out if you're well hydrated by looking at the color of your urine. A clear color is a sign of good hydration. However, if you see a darker yellow color, this means that you need to drink more fluids. You can drink fluids until you notice your urine is light yellow or clear. You can also weigh yourself before and after exercise. For each pound lost, you should drink 2 ½- 3 cups of water. To restore hydration, you should try to regain the fluids in the 2 hours after you finish the exercise.


What should I eat to fuel my exercise?

Before Exercise: The food you eat before you exercise greatly affects the quality of your athletic performance. These tips will help you plan your pre-exercise meals to prevent low blood sugar, to keep you from feeling hungry, and to fuel your muscles for training and competition.

Hours Before Exercise Ideas of What to Eat Ideas of What to Drink
1-2 Fresh fruits such as melon or vegetables (low fiber, such as tomatoes), crackers, granola, or cereal bars Water, fruit or vegetable juices
2-3 Granola bar and yogurt, ½ bagel and peanut butter, cereal and milk Water, fruit or vegetable juices
3-6 Fruits, vegetables, breads, bagels, peanut butter, lean meat, cheese, yogurt, full sandwich, cereal with milk and fruit, baked potato Water, fruit or vegetable juices


After Exercise: It's very important to refuel your body after a hard workout. Because your body replaces glycogen stores in your muscle within the first few hours after exercise, it's important to eat carbohydrates and some protein soon after your workout.


Follow these tips when planning your post-exercise meal:

What is carbohydrate loading?

Carbohydrate loading is a technique used to increase the amount of glycogen in muscles. It involves eating extra carbohydrates during the week before a competition, while at the same time cutting back on your training. Carbohydrate loading is intended for marathon runners and other competitive athletes and isn't helpful for most athletes.


Should I eat extra protein or use protein supplements?

Although some extra protein is needed to build muscle, most people get plenty of protein from food. Getting extra protein from supplements won't have any added benefit. Eating enough calories is actually more important for building muscle. Without enough calories, your body can't build new muscle.


Should I eat energy bars?

It depends. There are many different energy bars you can buy. Some are high in carbohydrates and protein or both; energy bars may also be high in sugar. They don't contain any magic ingredients that will help your athletic performance. Foods that have some carbohydrate and protein in them such as yogurt, cheese and crackers, or peanut butter and fruit are typically just as good (if not better) and may cost less than energy bars. However, energy bars are convenient and may help you fit in a snack when you otherwise couldn't.


Remember: Athletes need more food and fluids than non-athletes. Regular meals and healthy snacks will help fuel your body before and after exercise. It's important to give your body enough of the right fuel in order to feel good and have the energy you need to perform your best.


If you're concerned about sports nutrition, here's a tip on how to bring it up with your health care provider: "How can I eat right to stay fit for sports?"


Written by the CYWH and YMH Staff at Boston Children's Hospital


Updated: 7/23/2013


Related Guides:

Healthy Eating

Healthy eating is a way of balancing the food you eat to keep your body strong, energized, and well nourished...



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