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Doctor insights on: Bmi Norms Teenager Underweight

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Dr. Cornelius O'Leary Jr
543 doctors shared insights

Body Mass Index (Definition)

Body mass index (BMI) is a measurement based on a person's height and weight, to decide if a person is too heavy or too light for his height. The index is a number that can be in the underweight range, normal range, overweight range, or obese range. Children use different number ranges than adults do, ...Read more


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I'm 20 years female,I'm severely underweight my BMI is 15 my eating habit is normal and I feel hungry most of time I do not know what is my problem ?

I'm 20 years female,I'm severely underweight my BMI is 15 my eating habit is normal and I feel hungry most of time I do not know what is my problem ?

Need to see doctor.: I usually like to provide concrete answers to questions here, but your query requires some definitive testing. There could be many metabolic, infectious, nutritional, gastrointestinal, endocrine issues causing the problem with your weight. Your BMI is dangerously low. You need to initiate a local work-up with a doctor right away. Please. ...Read more

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I'm 17, 5'2, 39 kg. The doctor said i'm severely underweight. What can I do to have a normal result on my bmi? I eat a lot but is still thin.

Underweight: The combination of being underweight and losing your hair suggests you might have a thyroid problem check with doctor first and then see a nutritionist for help. ...Read more

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The healthtap bmi scale indicates that I was underweight. But my physician said that my weight is normal. What information should I rely on?

The healthtap bmi scale  indicates that I was underweight. But my physician said that my weight is normal. What information should I rely on?

BMI and young people: BMI by itself is not that useful in younger people that are potentially still growing. For kids, we plot BMI against age and sex to get a percentile. HealthTap's BMI calculator is likely inaccurate. If your doc says you're good, you're probably good! But if you want, you can check out this CDC calculator that shows age-and sex-adjusted BMI percentile (http://1.usa.gov/1ka5FS4). ...Read more

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I'm 10 weeks pregnant and gained a significant amount of weight in my first trimester. However, my BMI was underweight (110lb at 5.7ft) before conceiving. Now my BMI is "normal". Does being underweight before make my extra weight gain ok?

I'm 10 weeks pregnant and gained a significant amount of weight in my first trimester. However, my BMI was underweight (110lb at 5.7ft) before conceiving. Now my BMI is "normal". Does being underweight before make my extra weight gain ok?

Pregnant weight: Absolutely. Those with a pre-pregnancy BMI under 18.5 should gain 28–40 pounds. Normal-weight women (BMI, 18.5–24.9) should aim for 25–35. Overweight women (BMI, 25–29.9) should aim for 15–25. Obese women (BMI, 30 or more) should gain only 11–20. Govern a starting BMI of 17.2 I would expect you to gain 40 pounds. ...Read more

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Im underweight my bmi: 16, tried everything but cant gain kgs, don't hve any disease, can you tell me hw to gain weight?

Im underweight my bmi: 16, tried everything but cant gain kgs, don't hve any disease, can you tell me hw to gain weight?

Can be hard: To gain weight, just like for more individuals the opposite is true in regards to weight loss. Assuming your doctor has ruled any disease like thyroid or malabsorption issues, it will come down to a balancing act of consuming more calories than your burn(need more in than "out"). This can require strict monitoring of the caloric content of your food and activity levels. ...Read more

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My height is 1.532 m my weight is 44.543 kg and my BMI is 18.98 kg . I can't seem to gain weight even with bc pills. Am i consider underweight?

My height is 1.532 m my weight is 44.543 kg and my BMI is 18.98 kg . I can't seem to gain weight even with bc pills. Am i consider underweight?

Underweight: Did these issues develop before age 24? If so you must see a Gynecologist as soon as possible. Even if this occurred closer to age 24 you must see the Gynecologist. Hope all goes well. ...Read more

Bmi (Definition)

Bmi or body mass index is how we define if a person is under or overweight. It is calculated my taking your height in meters and dividing it by your weight in kilograms squared. Or using a bmi calculator. A normal weight is a bmi between 18-25. Obese is a ...Read more