I'm 15 I weigh about 130-140, and I'm about 5'8
I'm 17, 5 foot 10 and I'm very underweight, you can see my ribs.I eat plenty of food and almost all of what I eat is home-made so there should be no shortage of nutrition but I just don't gain any weight at all.What I wouldn't give to have a normal weight
Just eat more fatty foods. That's what I did to gain weight.
Just go to MacDonald's once and you'll be fine.