I'm seriously underweight right now at the age of 21. I'm unable to increase my diet, and still wish to get 1-2 inches increase in height and gain more weight.
Any tips?
I don't know about height but to gain weight you gotta change your diet, maybe you are not eating enough. Find food that you would've love and eat them. When you put food on your plate, make sure to finish all of it. Avoid having left over.