The new "HCG Diet" claims to make it possible to lose 1-2 pounds a day. But some medical experts say the new fad is too good to be true, and possibly dangerous.
The diet requires getting a shot every day containing the hCG hormone usually produced by pregnant women.
The hormone tricks the body into burning fat and not muscle.
Dr. Lionel Bissoon, author of "The Cellulite Cure," charges $1,500 for 30 days worth of injections. He said he's gotten nothing but positive reviews from patients.
"I've seen people lose weight, people who have failed diets," he explained. "People who have failed pretty much everything and have seen it makes a big difference for them; they are able to lose the weight"
The HCG Diet also involves cutting calories to as little as 500 a day.
Psychologist Guldal Caba has already lost 23 pounds under the diet.
"This is an opportunity to train the body to eat smaller portions, eat healthy foods, and learn what works for you," Caba explained.
But in a recent survey of 23 doctors from various specialties, none said there is any scientific evidence that the hCG hormone is an effective weight loss tool. They added that there are risks, including blood clots, pulmonary embolism, depression and headaches.
"The question is [what is the] permanence or the impermanence of the weight loss with this plan when the injections stop," nutritionist Lauren Slayton said.
Also, the Food and Drug Administration hasn't approved the use of hCG hormones for weight loss.