No breakfast. For details, please refer to the following contents: Exercise and fitness has become a worldwide craze. Even during the lunch break at noon, there will be office white-collar workers going to the nearby gym to exercise. Is this kind of exercise good for your health? When is the best time to exercise in a day? According to foreign reports, some sports and nutrition experts have conducted a comprehensive study on this. First, exercise should be avoided for a period of time after meals. Because after-dinner sports meeting: 1. Stimulate the stomach: Exercise after a full meal will bring mechanical stimulation to the stomach, making the dissolved matter in the stomach vibrate left and right, which may cause vomiting, stomach cramps and other symptoms. 2. Disordered blood flow distribution: After a full meal, the digestive organs need a lot of blood for digestion and absorption, and the muscles of the whole body also need a lot of blood to participate in exercise, so it will seize the blood of the digestive organs, leading to disorder of digestion and absorption, which not only affects the exercise effect, but also harms the body. 3. Affect the exercise effect: After eating, the parasympathetic nerves in the body are easily inhibited. At this time, if the body wants to exercise, the exercise effect will be discounted. 4. Increased insulin secretion after meals can inhibit lipolysis, and the energy source is limited. Because there is less fat decomposition, it is not appropriate to carry out weight loss exercise at this time. The study found that high-intensity exercise can be carried out two hours after meals; Moderate exercise should be arranged one hour after meals; It is most reasonable to do light exercise within half an hour after meals. According to this, several optimal exercise periods can be deduced: morning period: from morning to morning before breakfast; 2 hours after breakfast to afternoon before lunch; From 2 hours after lunch to before dinner in the evening; From 2 hours after dinner to early before bed. Exercise in each period has advantages and disadvantages. For example, in the morning, when the human body performs strenuous exercise, it can excite the sympathetic nerve. This rapid change will cause a series of changes in the body, affect the mental state of the whole day, and be harmful to health. In addition, at this time, blood sugar is at a low level, and exercise consumes a lot of blood sugar, which easily leads to hypoglycemia. Afternoon sports are influenced by objective factors such as work, work and housework. Modern sports physiology research shows that the highest and lowest points of human physical strength are controlled by the "biological clock" of the human body and generally reach the peak in the evening. For example, the lowest point of oxygen absorbed by the body is at 6 pm; Heart beating and blood pressure regulation are most balanced between 5 pm and 6 pm, while the body's sense of smell, touch and vision are also most sensitive between 5 pm and 7 pm. So, on the whole, the effect of exercise at night is better. In addition, the hormone activity of the human body is also in a good state between 4 pm and 7 pm, and the body's adaptability and nerve sensitivity are also the best. Therefore, experts advocate evening exercise, but in the evening time, we should pay attention to the intensity of exercise, otherwise too high intensity will excite sympathetic nerves and hinder sleep.