Obesity, also known as adiposis, is a chronic metabolic disease caused by excessive accumulation of fat in the body or abnormal distribution of fat. The causes of obesity are numerous and complex. The exact cause is not clear, but it is believed to include a variety of factors such as genetics and environment, which interact with each other. From the perspective of genetic factors, the probability of developing obesity significantly increases. The second factor, the environment, mainly includes diet and physical activity. Long periods of sitting or lack of sports, and insufficient physical activity can lead to reduced energy expenditure. Poor dietary habits, such as overeating, a preference for sweets or greasy foods, can easily lead to obesity. Thirdly, it can be due to some genetic abnormalities. Fourth, obesity in childhood is also more likely to progress to adult obesity, with more than 50% of individuals who are obese after the age of six developing obesity in adulthood.