text: what's a good diet for an 18 yr old girl? ok. i'm 18, and i weigh 130 but i'm 5'5'' and very skinny or supposedly that's what everyone tells me. they say i could gain some weight if anything. however i'm not satisfied with my body. what's a good diet i could do? any suggestions would be greatly appreciated. thanks. same diet that is good for anyone. see site below on healthy foods that help you attain ideal weight and a strategy to help you eat less of unhealthy foods. i am a male and 5'5" and weigh 120 and am slim and muscular. princess diana was 5'11" and 125 pounds. marilyn monroe (sex symbol) was 5'5" and 117 pounds.  are your friends 250 pounds so you are skinny compared to them?