1. It really depends on the person. Many people have adapted to a meat and potatoes diet and can digest it just fine. Others cannot. If she's having frequent BMs, like at least once a day, she's adapted. but gaining weight means she's eating too much, pure and simple, and exercising too little. It's a common problem for today's children - they don't get out! now that everything is cement everywhere, where do they play? How? I was always climbing trees, playing in the cardboard boxes leftover from refrigerators, sliding down hills, riding bikes, bodysurfing, you name it! but kids today? computer games are all they know. It's up to the parents to get them into something like a soccer league or dance lessons.