It's a bit simplified, but if you're really skinny you can get your body through a gap that you can get your head through - measured neck to forehead.
I am no doctor but I do understand nutrition. Diets and pills do not work. You need to go back to fruits and vegetables. If you cant stand them you can get a actual juicer and juice fruits and...
progesterone
You can stop smoking (if you smoke), don't drink alcohol, don't use drugs, and eat healthy foods.
weight gain breast size increases breast color changes sensitivity to smells