I am 16 years old and tall. But day by day I am getting thinner and thinner. My waist has only 25 inches. And I weight 38kg. I want to gain weight.what should I do? :mad:

Have you been to your doctor about this problem? Unless your eating less or on a very bad diet, there is no reason you should be losing a lot of weight. There maybe an underlying problem causing this.

My advice would be to see your doctor about this and if there are no problems with your health, myself and other members are more than happy to help recommend some ways that can maybe help you.

Are you growing taller fairly quickly?

I agree, a quick visit to the doctor first might be all the answer you need. There are things you can eat that should add some pounds... but you might be stuck with a really high metabolism. See what the doctor suggests...