I'm already so thin. Ever since I had my son back in 2010 i dropped 40lbs n I haven't been able to put on any weight! I can eat all day every day junk food fast food anything u name it and not a single pound will be gained! I want my figure back. Being so tiny is not great! Help!
Eat a lot of healthy calories. No junk food or fast food! Even though you're skinny bad food is just as unhealthy for you as for an overweight person. Exercise. Interestingly enough the advice given for losing and gaining weight are just about the same, apart from that a person wanting to gain weight of course should eat more.
Carbs and protein give about the same amount of calories, fat twice as much. Don't be afraid to eat fat, as long as it's healthy fat!