What BMI is considered underweight?

A Body Mass Index (BMI) of 19.9 and below is categorized as underweight. This classification is part of the standard BMI categories used to assess health risks associated with body weight. Underweight individuals may be at risk for various health issues, including nutrient deficiencies, weakened immune function, and potential complications related to treatments or surgeries.

The BMI calculations are based on a formula that compares a person's weight to their height, allowing for an assessment of whether they fall within underweight, normal weight, overweight, or obese categories. The boundaries for these categories are essential in guiding healthcare professionals in evaluating a person's health status and recommending appropriate lifestyle or medical interventions.

In contrast, other ranges provided, such as a BMI of 20-24.9 (which is considered normal weight), 25-29.9 (overweight), and 30-39.9 (obesity), do not fit the definition of underweight and therefore do not apply in this context. Understanding these distinctions is crucial for professionals in the healthcare field to identify individuals at risk due to their weight status.