Answer:
Ask your parents. Follow what you believe if you're really faithful to it. If not I'd say do what you want.
True. It helps relieve stress
Nodding your head is a way to show you are agreeing, but no verbal communication occurs
This depends on the person, as people have different needs and athletes need more calories then normal scholars. The average is about 1,600-2,100. But again it depends on the person, for example I can only eat about 1,500 calories a day, despite the fact I'm an athlete, my friend however can eat about 2,500. If this is for personal use I would recommend consulting a doctor or trusted adult before you go on a diet.
Hope this helps :)
Anorexia or purging otherwise known as bulimia.