Yes you can gain weight being bulimic. The hardcore bulimics who actually lose weight from being bulimic are the ones who are dying. They are no different than the people who are malnourished and starving. Is it worth it? NO.
If you want to lose weight and not lose control over your life then just calorie count and exercise. There is no shortcuts. Unless you can afford surgery but then you have to be able to risk it. EVERYONE i know who has had some type of weight loss surgery had severe complications.
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