Why can some people eat anything and still lose all their weight?

Not that I want to eat poorly I am just wondering how people continue to make poor food choices after surgery and still lose. I have a friend who has been post op going on six years and she has never eaten the right foods, exercised or taken her vitamins. She has lost over 200lbs and maintains it. If I even think about something forbidden I hit a plateau. Why is that? I have to exercise watch my portions and get plenty water to just lose 5lbs in one month now.

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