one of the main causes of weight gain is dieting. Dieting makes you fat. As you reduce your food intake to lose weight, your body put itself on 'famine alert'. It gets the impression that food is scarce and therefore it slows down your metabolism to get the best use of the small amount of food it is receiving.
When you say you want to lose weight, what you actually want to lose is fat. If you lose weight rapidly, almost 25 percent of that weight loss can be made up of water, muscle and other lean tissue.
The reason for this is that your body is actually programmed to hold on to fat. So in times of what your body considers to be a 'famine', it will actually go as far as breaking down muscle and losing water in order to hold on to its fat reserves. Faddy diets suggest that you can lose up to 10 pounds in a week, but remember this: it is physically impossible to lose more than 900g (2lb) of body fat in a week.
Furthermore, if you lose weight quickly by restricting your intake and then go back to eating normally, a much higher percentage of the food you eat is laid down as fat. Why? Because your body wants to build up extra fat stores, in case this type of famine occurs again. There's also the question of metabolism. When you crash diet, your metabolism slows down to conserve energy and make the most out of the small amounts you are eating. What happens when you go back to eating normally? Well, everything you eat is being dealt with at a much slower rate and more fat is stored.
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