Bulimia nervosa is not dieting and in fact will only make a person sick (literally as well as figuratively). People purge their food through vomiting and laxatives because they think it will make them lose weight, but actually they might gain weight because in order to be considered bulimic a person must be taking in 20,000-40,000 calories in one sitting and purging them through different methods. If the person is just throwing up their dinner then I would say they are probably anorexic or depressed.
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Yes it can and usually does. People who normally end up bulimic do it because they are afraid to gain the weight of the food that they just ate.