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But eating too much fat is associated with heart disease, some cancers and other major problems, and probably means you don't get enough carbohydrates. How your body uses fat for energy depends upon the intensity and duration of exercise: When you rest or exercise at low to moderate intensity, fat is the primary fuel source.

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Despite the testimonials to muscle size and strength, there is no evidence that andro, creatine or any other substance enhances athletic performances over what could be attained by practice, training and proper nutrition.

When you are flattened by the stomach flu, you may lose fluid through vomit and diarrhea. (Gastrointestinal illness is a major cause of dehydration, but anything, food poisoning or an alcohol overload, for example that makes you throw up several times in a short period of time can dehydrate you.) And if you're spending that much time getting acquainted with the toilet, you probably will not feel like eating or drinking anything.

Fats

This can happen if you start exercising without much muscle glycogen, exercise heavily for more than an hour without eating more carbohydrates, do repeated high-intensity, short-duration exercises or participate in multiple events or training sessions in a single day. Use a carbohydrate strategy to stay energized and perform at your best: Eat carbohydrates for at least several days before exercise/competition, so you start with glycogen-loaded muscles.

Lay off the offending activity, and don't lift anything above shoulder height. Once the pain subsides, begin shoulder/rotator-cuff stretching and strengthening exercises, icing the injured area for 15 minutes after each rehab session. Strengthen your rotator cuff by performing internal and external shoulder rotations. (You'll need a trainer to show you how to do these correctly.) Have a coach or trainer assess your weightlifting, swimming or tennis technique.