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Doctor insights on: Extremely Underweight Bmi

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Dr. Cornelius O'Leary Jr
530 doctors shared insights

Body Mass Index (Definition)

Body mass index is also known as BMI. 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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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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Why might I look fat if my BMI says i'm underweight?

Two issues: Bmi is an estimate dependent on a fudge factor that assumes bone structure & muscle mass are consistent along all body types.It can be off some. To verify bmi assessment, plotting height & weight along standardized growth charts (cdc or who) gives a better graphic representation of proper weight for height. If you are underweight by both systems, your brain may be giving you a distorted self image. ...Read more

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I'm underweight, my BMI is 18.6, what shall i do?

Slowly gain: Eat a health diet with some increased carbohydrates. Be sure to eat balanced meals and stay healthy with exercise as well, so you do not get fat, yet your weight slowly rises to a weight you are comfortable with. It is best to discuss with your dr. And parents, so the dr. Can provide support and diet advice and your parents can help as well. Best wishes. ...Read more

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My BMI indicates that I am underweight (bmi is 18.02) should I gain weight?

My BMI indicates that I am underweight (bmi is 18.02) should I gain weight?

You're not a number: The BMI was never intended for use by individuals. If you feel well, are athletic, & keep up with peers at fitness activities, you have no reason to change. Elite track athletes have BMI's like yours. And don't try to gain by eating to gain fat -- a man needs no body fat and a woman needs only a little. Exercise regularly, handle any health issues with your physician's help & weight self-solves. ...Read more

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My BMI is 18 & so I am classed as underweight. I am trying to be more healthy&fit, so if i lose a couple of pounds would this be bad for my health?

Underweight: If underweight is due to low calorie intake or bulimia it is not good however if u have always been low weight u may be fine being over active and eating less may push you to a weight at which u stop having cycles cycles with incresed Estrogens are important for bone mass donot lose weight by cutting intake at this stage make sure you donot have a medical cause for weight loss. ...Read more

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Hoping you can tell me, is BMI of 15.9 too underweight?

If your BMI is: 15.9 and you're a female who is about 5 feet tall, your weight would have to be about 80 pounds -- which would be considered very, very thin and probably unhealthy. Are we talking about someone with an eating disorder who needs psychiatric help? ...Read more

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I eat a lot but i dont gain any weight, my BMI tells me im underweight, what can i do to gain weight and look healthy?

BMI: I would have your pediatrician share your height and weight charts. If they are both below the normal ranges you need to see a Pediatric Endocrinologist. If they are both normal - relax. If one is OK but the other is not you need the pediatric endocrinologist. ...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