Generally speaking, it is most appropriate to have breakfast 2030 minutes after getting up. At this time, people's appetite is the strongest and digestion and absorption are at the best level. It is best to consume at least 500 ml of water before breakfast, which can not only help digestion, but also replenish water for the body, eliminate waste and reduce blood viscosity. Nowadays, many people have become accustomed to the inverted pyramid diet of "eat less breakfast, eat well at lunch and eat well at dinner". Moreover, many families have rich dinner dishes, including chicken, duck, fish, meat and eggs. Most of these foods are high in protein, fat and energy, which will enhance the coagulation of blood lipids, easily deposit on blood vessel walls, and promote the formation of arteriosclerosis and thrombosis. It will also cause the liver to produce more low-density and very low-density lipoproteins and carry too much cholesterol to the arterial wall, resulting in a "worse" situation. With the increase of age, the human body's ability to deal with sugar decreases. Daily calorie supply concentrated in dinner will accelerate the decrease of glucose tolerance, increase the burden of islet, promote pancreatic aging, and eventually lead to diabetes and various cardiovascular and cerebrovascular diseases.