There is no specific number of kilograms for small body weight, anything with a BMI of less than 18.5 can be considered small body weight. Normal people’s BMI is between 18 and 24, can be converted to see their weight base is how much, the calculation formula is weight ÷ height ² (weight unit: kg; height unit: m.). , If the value obtained is less than 18, it can be said that it is a small weight, which also means that the body is too thin. If the resulting value is too small, it is important to consider one’s diet during the day and whether the digestive system is suffering from indigestion, nutrient absorption disorders, gastrointestinal discomfort, etc. To achieve a more ideal weight base, diet and exercise are more important. If you are underweight, it is recommended that you adjust your diet in time to supplement your nutrients, eat a balanced diet in your daily life, and exercise appropriately.