| If you are hungry, tired, and craving a quick energy boost prior to exercise, you don't have to eat sugar for energy. A simple snack of crackers, fruit, or a low fat granola bar can perk you up. Better yet, prevent the need for an energy boost! Simply eat a heartier breakfast and lunch that fuels you earlier in the day so you won't be running on fumes later that afternoon. These meals will be digested in plenty of time for your afternoon or evening workout. You will feel ready for action rather than hungry, tired.
For some people, eating lots of sweets and sugary foods for "quick energy" 15 to 45 minutes before exercise can hurt their performance. Here's why: After you eat any kind of concentrated sugar (such as soft drinks, jelly beans, juice), your body secretes insulin, a hormone that carries sugar from your blood into the muscles. Exercise, like insulin, also helps carry sugar into the muscles. The combined effect of insulin with exercise can cause blood sugar to drop abnormally low. If you are sensitive to blood sugar changes, you may feel shaky, light-headed, uncoordinated and tired. This is needless-and preventable.
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