There are many obese people in today’s society, and the accompanying diseases caused by obesity are also a serious threat to human life. As early as 1997, the International Health Organization (WHO) has recognized obesity as a disease, so, fat is also a disease. In terms of pathology, the root cause of obesity is: eat well and move less. Because the food intake is too much, the amount of exercise and not enough, resulting in excess energy, by the body into the final transformation of fat to stay. Although obesity can be hereditary, parents obese children may be easy to fat body, but as long as they can pay attention to diet control, a good habit of life, in fact, will not necessarily become fat. However, in life we often find a phenomenon, fat people’s friends to become fat than ordinary people’s friends to become fat more common. As early as 2006, the New England Journal of Medicine published a study on the social circle of fat people, the report showed that: when a friend becomes fat, the probability of becoming fat themselves will increase significantly. The analysis found that when a person becomes fat, it unknowingly affects the friends around him or her. For example, fat people are generally very able to eat, and when they eat together naturally also easy to eat more, plus fat people and do not like to exercise, but also let you or active or passive become unmotivated, and over time, naturally become fat. What’s worse, because friends are fat, will make your subconscious feel a little fat does not matter, resulting in reduced sensitivity to weight change. We often see families in our lives are fat for this reason as well. Most fat people prefer high-calorie food, and the family eats the same, it is difficult not to become fat. According to the above perspective, fat is also “contagious”, a person who is getting fat will bring fat friends around, but what if a fat person is losing weight? Generally speaking, fat people who are losing weight will have the following characteristics: eat healthier and will control the amount, have a certain amount of time to exercise, more sensitive to their weight. These characteristics will also bring their own influence, so that they slowly change to this healthy lifestyle, plus have this friend as an example, they are also easy to persist. Even if that friend later fails to lose weight, he will be reminded of himself because of his example, raising his guard against becoming fat and eventually adopting a healthy lifestyle. So when you have such a fat person around you, your correct approach should always be to remind yourself not to be influenced by them, restrain food intake, adhere to the exercise, maybe you can have a good healthy body under the influence of each other.