Exercise on an empty stomach is not conducive to health and weight loss. Because the human body is in a moment of vigorous metabolism during exercise, energy consumption increases at this time. If you exercise on an empty stomach for a long time, it will cause insufficient storage of liver glycogen, a large amount of blood sugar consumption, and no timely supply. In this case, the blood sugar concentration will drop rapidly, which will easily lead to hypoglycemia, and may cause dizziness, palpitation, black eyes and other symptoms.