Running is a simple exercise method, and many girls prefer to use it to keep fit. But it should be noted that running on an empty stomach is actually harmful to health. Because people's blood sugar level will drop rapidly when running on an empty stomach, it is easy to induce hypoglycemia, syncope and arrhythmia when the blood sugar level is low. So eat a small amount of carbohydrates such as biscuits before jogging in the morning.