For example, an older person who is considered a healthy weight, but is completely inactive in their daily life may have significant amounts of excess body fat even though they are not heavy. BMI is further influenced by factors such as age, sex, ethnicity, muscle mass, body fat, and activity level, among others. Due to a wide variety of body types as well as distribution of muscle, bone mass, and fat, BMI should be considered along with other measurements rather than being used as the sole method for determining a person's healthy body weight.īMI cannot be fully accurate because it is a measure of excess body weight, rather than excess body fat. BMI is only an estimate that cannot take body composition into account. Limitations of BMIĪlthough BMI is a widely used and useful indicator of healthy body weight, it does have its limitations. Consult your doctor if you think you or someone you know is underweight, particularly if the reason for being underweight does not seem obvious. In some cases, being underweight can be a sign of some underlying condition or disease such as anorexia nervosa, which has its own risks.
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