According to reports, researchers from Japan Medical Graduate School conducted a 12-year follow-up survey on 50,000 people aged 40 to 79 in Miyagi Prefecture, Japan, and found that at the age of 40, the average life expectancy of slightly overweight people is 6 to 7 years longer than that of thin people, and the average life expectancy of obese people is about 5 years longer than that of thin people.
Researchers said that in the past, people thought that thin people had a shorter life span because of their relatively weak immunity and unstable blood pressure, but this study showed that even if these factors were removed, thin people still had the shortest life span.
The researchers also warned that this does not mean that the more people eat, the better. Too thin people need to gain weight to reach the standard weight, and it is undoubtedly not good for people with standard weight to gain weight again.
Height and body mass index (BMI) are widely used to judge people's weight in the world. This index is calculated by dividing the weight (kg) by the square of the height (m).