hi. i am really skinny too and young, so my metabolism is fast. when i started on vyvanse, i did not eat at all. i wasnt even hungry anytime. i lost weight but after like 1.5-2 months, my appetite returned to normal. it seemed like when the vyvanse settled, alot of the "side effects" i had disappeared. now i feel normal, but just more focused and clear. and i eat.

i think you have to give it some time. if you dont want to lose weight, force yourself to snack. im poor so i cant buy alot of cheese because in the USA its expensive, (but i LOVE it!!!).... but i eat peanuts in the shell and peanut butter sandwiches or peanut butter and banana

good luck