Normal weight: BMI = 18-25

Overweight: BMI = 25-30

Mild obesity: body mass index >; 30

Moderate obesity: body mass index >; 35

Severe obesity: body mass index >; 40

Extended data:

Professor Steles, an American gerontologist, found that among the 70-year-old people in California, the mortality rate was the lowest among those who exceeded the standard weight10% ~ 20%. When the weight is too low or too high to 30%, it is easy to cause diseases and affect life expectancy.

The reason why fatter people live longer is that the subcutaneous fat layer of obese people is thicker, and their cold resistance and disease resistance are stronger than ordinary people, and they can withstand the "torture" of diseases. However, thin people have relatively weak resistance and poor adaptability to the environment, especially acute infectious diseases such as influenza, upper respiratory tract infection and pneumonia, so they are ill and short-lived.

Medical research also found that if women lose weight significantly from the age of 50, they are prone to fractures, especially hip fractures. In addition, the incidence of visceral ptosis is very high in thin people, and the most obvious is gastroptosis.

Therefore, in old age, people should not be too fat, but they should not be too thin, and it is best to be a little fat. Of course, exercise and mental health are also very important.

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