On the question of whether to eat before exercising, now advocates that a small amount of food should be eaten before exercising, related to the age of the body, related to the function of the organs. Fasting will lead to hypoglycemia, hypotension, fainting, shock may occur after exercise, eat some food, about half an hour, an hour before exercise, the organism damage is relatively small. However, there are some young, weak girls in the process of weight loss, eating less, after there is more strenuous activity, will lead to fainting or hypoglycemia, immediate transient black haze, low blood pressure, are possible, advocate eating something before exercise.