Weight gain

am 24 years and i weigh only 40 kgs, my friends alwalys laugh at me because am too small, i try to eat alot but still i dont add any weight. what should i do to increase my weight?

You should start doing exercise and eat healthy food. And try to stay as happy as possible. Moreover you should eat wheat with milk.
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personally i dont think you should worry about your weight. If your confident about yourself and happy with yourself you shouldnt care what others think of you. In a way your lucky because many people gain weight very quickly. At least you dont have to wory about the amount of food you consume.
if you really want to gain though, i heard eating wheat products helps.