I am underweight. I don't have an eating disorder; I just have a fast metabolism. I want to know how I can gain some weight and not stick out like a sore thumb for being so thin. - Giana*
An unfortunate side effect of the increase in people who are overweight and obese is that naturally thin people now might feel even skinnier. If you have always been thin for your age or height, there probably is no need to try to gain extra weight. Just be sure to eat a healthy diet so you get all the nutrients your body needs. If you recently lost weight, though, or you have concerns about your weight, talk to your doctor.