We've talked about this diet before - HCG. It claims you can lose up to 30 pounds a month with no side effect. Sounds too good to be true, right? It is and it can be deadly.

HCG, is a hormone produced during pregnancy. It releases stored fat so the mother's body can use it for energy and nutrients. For the HCG diet, users inject the hormone hoping they'll be able to release the same fat. The claims are that the fat will be released from a woman's upper arms, belly, and thighs - most women's trouble spots.

The other big part of the diet is that users are limited to 500 calories a day. That's pretty much starvation as far as your body's concerned. Supposedly, thanks to the hormone shots, you don't feel hungry even though your body is starving.

What's the truth? Does HCG help weight loss? Yes - but only because your on a starvation diet. It has nothing to do with the injections. Over a decade ago researchers looked at HCG and found that it had zero effect on weight loss.

Our friend, Dr. David from the Yale University Prevention Research Center, checked it out too. He says HCG diets can be extremely dangerous. There are small side effects like headaches, leg cramps and hair thinning, but when you're starving yourself on 500 calories a day, your body doesn't get the protein it needs to survive, so it takes it from your vital organs, including the heart, and that can cause sudden death.

The FDA issued a warning that HCG shouldn't be used for weight loss. The injectable, prescription form of HCG is only approved as a treatment for infertility. The FDA has also received reports that HCG dieters have developed deadly blood clots in the lungs.

So what about those homeopathic drops of HCG you find online and at drug stores? They're completely bogus and a waste of your money. As we've said time and time again, the only sure-fire way to lose weight is to burn more calories than you consume.