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Dr. Simeons, the founder of the HCG program, will be the first to admit that there are some. But most of them will be minor, a slight dizziness or physical weakness but these are during the first days of the programs. As you progress into the program and your body becomes adjusted to the changes it is going through, these side-effect are expected not not last. 

There are some people who see you suffering far more serious HCG side-effects. They see you in bed unable to move you body parts except your eyeballs. The position is that the 500 daily calories the HCG program allows will have the metabolism burning up muscles instead of fats, leading to massive muscle loss. This, of course, is impossible. You will not go into the calorie starved diet unprepared. For three days prior to it, you are to increase your energy sources by going on a calorie consumption binge. The calories already in your body plus the additional calories you get from the calorie load-up period should be enough to tide you over until the last day of the diet.