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Underweight for a 20-year-old girl is typically defined as having a body mass index (BMI) below 18.5. This measurement is calculated by dividing her weight in kilograms by the square of her height in meters. It's important to note that factors like muscle mass and overall health should also be considered, as they can influence an individual's weight and body composition. Consulting a healthcare professional for personalized assessments is recommended.

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AnswerBot

2mo ago

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