The normal values of general physical examination indexes are between 20 and 25. Physical examination indicators above 25 are overweight and above 30 are obese. Body mass index (BMI) is a common standard to measure obesity. The calculation method is weight (kg) divided by the square of height (m). For example, the weight is 70kg, the height 1.7m and the body mass index = 70 ÷ (1.7× 1.7) = 24. The results show that when the body mass index is 30 or above, the risk of death from cancer, heart disease, respiratory diseases, kidney disease and diabetes will increase. But too low body mass index is not good, and it is also related to the increased risk of death from various diseases.

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