defined by a BMI of under 18.5. Sometimes Being underweight is not good for your health. Find out what you can do if you’re concerned about yourself or someone else. Also there are some people who eat alot but can’t gain weight. Being underweight can be just as bad for your health as being obese and being skinny may lead to suffering from many health related issues.

What is the best way to determine if someone is underweight?
You can measure your weight by using body mass index (BMI).Use this BMI calculator to see where you fit on the BMI scale (opens in a new tab).

BMI Categories:

Underweight =