All about Healthy Weight Gain and Bulking Up - Learn about the Definition of Underweight
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What is considered under weight? Taras Raggio: There are number of ways to measure an under weight person, one of the way is just as if you are underweight is to use a body mass index or BMI for sure. BMI measures a person's weight to their height, and BMI can tell if it's proportional. A person who is under weight should have a BMI of not less than 18.5 kilo grams.