Well, I think that celebrities are always sorrounded by an extremely competative environment. They are always on the run from magazines and the gossip-y media. They are so afraid of waking up in the morning, and while drinking their cup of coffe, to read about themselves- of how fat they got and see a horrible pictures of themselves, where they look huge!
This is the reason why they have such great self discipline. They dont eat fatty foods, and they tend to do a lot of sports. However, dont be mistaken- some of them are obssessed about their looks and weight. Remember all the celebrities who became anorectic.
You should just eat well, and do lots of sports. And of course, do not forget to drink water!
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