At a classmate gathering, you will find that the old classmates who were still slim in the past are now feeling like they have blown their breath. When young, eating, drinking, and having fun, one can still control their weight; When people reach middle age and have a regular lifestyle, their stomachs are getting bigger and bigger.

　　How many people have not escaped the "middle-aged obesity"?

　　Middle age weight gain is a common phenomenon.

　　Regardless of gender, the age group with the lowest BMI index is between 18 and 29 years old. That is to say, before the age of 30, it may be the time when we are "thinnest".

　　Once you reach the age of 30-39, the BMI index significantly increases, far exceeding the level of 18-29 years old.

　　Moreover, there are some differences in weight gain between men and women.

　　Women's weight gain is a 'sustained gain', and their BMI index rises by one level every 10 years. It wasn't until the age of 50 that this kind of weight gain stopped.

　　In contrast, male obesity is a sudden increase in weight. Middle aged men aged 30 to 49 reach the highest level of BMI index. But in the following years, the BMI index slowed down and even showed a significant downward trend.