Hi. im a 19 year old girl whos not sexually active and live a pretty quiet life but my body is having problems gaining weight when i eat. i dont over stuff myself and i eat a balanced dinner every night along w/ keeping my lunch and breakfast 2. ?

Basics: You can certainly gain with a balanced diet just the same as an unbalanced one when the total intake of calories is more than your body needs. You may want to consult a clinical nutritionist (hospitals/diet centers have them) to find out what your needs are & how to stabilize or lose weight. Discussing when/how/what you eat is important. Exercise can also help but not as much as diet modification