Many male friends will have beer bellies, which will affect your image. The latest research by the German Federal Association for Nutrition Medicine shows that "beer belly" is related to male genes, just as female obesity starts from the buttocks, and most of male fat is stored in the abdomen. Of course, every man's genes are different, and the possibility of "beer belly" is also different. Generally speaking, teenagers have a "beer belly", often because of overnutrition; For middle-aged people, sleep quality is the main reason. With the increase of age, the deep sleep stage of men decreases. Because the quality of sleep is not good, the secretion of hormones will decrease. Hormone deficiency will increase body fat and gather in the abdomen. The older you get, the more obvious the effect will be. In addition, many middle-aged people sit in the office for a long time and lack exercise, which is easy to cause abdominal fat accumulation. When work pressure is high, many people will overeat, leading to indigestion, which is also easy to cause overweight. There are about 30 billion fat cells in the average man, and these cells will gain weight with age. Therefore, almost every man will gain weight after the age of 30, and his genes, hormones and slow metabolism will have an impact on his abdomen. "Beer belly" has little to do with "drinking beer". Traditionally, drinking too much beer will make people have a big "beer belly", but the latest research shows that how much beer they drink has nothing to do with their waistline. European researchers have found that people who drink beer are not more likely to have a beer belly or even obesity than those who don't drink beer. Although beer is not a diet drink, it is not the reason why drinkers are overweight. The researchers found that excluding factors such as exercise and education, people who regularly drink beer will not have thicker waistlines and heavier weights than those who don't drink or rarely drink.