If I used to eat bad food alot, then start eating healthy food can that cause heartburn?

Im 16 and i just started eating only healthy foods 2 weeks ago.. like veggies and fruit… now when i eat anything a little bit bad like pizza or chips i get a killer heartburn.Im not fat but i used to eat junk food alot.. i dont know whats going on. Does anyone know why this could be?

How much would you loose weight if you stopped eating for 2 weeks?

EXCEPT for things such as coffee, celery, carrots, and things like that. I am NOT doing this. My friend is doing this. And she thinks she will loose about 30 pounds in 2 weeks by doing this. I am concerned for her and am trying to prove to her that it is not possible to loose 30 pounds in a week. Is there any website that will calculate how much weight you will loose in 2 weeks?