The calculation method of body weight BMI index isWeight divided by height squared, unit is kg/m²:

1. Normal BMI range: 18.5~23.9, which is in line with the weight BMI range of normal people in my country. People with normal BMI should maintain their current living and eating habits and keep them within the normal range.

2. Obesity BMI index: If the BMI exceeds 23.9, you need to adjust your diet, actively participate in physical exercise, lose excess fat, and maintain your weight within the normal range.

3. Underweight BMI: If the BMI is lower than 18.5, you need to adjust your diet, increase the intake of protein and other nutrients, actively participate in physical exercise, increase your weight, and maintain it within the normal range. If the BMI is too high or too low, it should be adjusted in time to maintain the body's normal physiological balance.

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