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Weighing less than is normal, healthy, or required.
Insufficiency of weight.


Etymology: AS, under + wiht
1 a body mass index of less than 18.5. See also body mass index.
2 less than normal in body weight after adjustment for height, body build, and age.

Obesity Task Force classification

Bariatric medicine A weight classification based on the body-mass index–BMI, per intl consensus. See Obesity.
Weight type–OTF classification  
Underweight  BMI ≤ 18.5
Normal  BMI 18.5–24.9
Overweight  BMI 25–29.9
Obese  BMI 25–29.9
 Class I   BMI 30–34.9
 Class II   BMI 35–39.9
 Class III   BMI ≥ 40


A ratio of height-to-waist circumference that is below an acceptable range for healthy people.

Patient discussion about underweight

Q. I need food guide for underweight. This is Liam. I had three kids and all are underweight? I don’t know how to make them healthy. I need food guide for underweight. They refuse to have healthy food. How can I get him to eat more and eat healthy, without having to force them?

A. Liam, do not give them too much of juice as it often contain more sugar and less vitamins than fresh or frozen fruits. After a period, give them healthy drink (like milk) instead of juice. If your child is more active than the food they had, then the child will surely be termed as an underweight. So make sure to give, more energizing foods like carbohydrates for an over active kid.

Q. How to loss weight like a diet with tea,pills or other kind of healthy thing.

A. drink 8 oz of warm water with 1 tablespoon of lemon... first thing in the morning

More discussions about underweight
References in periodicals archive ?
That is exactly the question Ivy Management asked and why their Ivy Latin American Strategy Fund and Ivy New Century Fund are underweighted in Mexico and overweighted in Brazil and Argentina.
Managers who find themselves underweighted yen-denominated assets can always buy short-duration Japanese government bonds (JGBs) to exploit the yen's rise - but Horan conceded this strategy has limited benefit for income managers because they must then accept an extremely low JGB yield, such as 0.
Broadly speaking, Japan still looks expensive, and GEIM remains underweighted in this market.