There have been numerous studies conducted to test if HCG plays a major role in weight loss or if the weight drops due to the severe reduction in calories.
A study in 1963 focused on two test groups of 10 women who were considered to have severe chronic obesity.
Both groups were placed on a diet of 550 calories per day.
One group was daily injected with shots of HCG while the other received a placebo.
At the end of 45 days, both groups lost an average of twenty pounds.
Both groups admitted to experiencing hunger.
The conclusion was that there was no difference between the women who received HCG and the women who did not.
The weight loss was a result of eating about three times less than the recommended daily calorie intake.
FDA nutritionist Shirley Blakely says: “Living on 500 calories a day is not only unhealthy—it’s hazardous.
You are at increased risk for side effects that include gallstone formation, an imbalance of electrolytes that keep the body’s muscles and nerves functioning properly, and an irregular heartbeat.” (5)
In 1981, German physicians replicated earlier research and found negative results with four out of ten studies in which one control was without HCG and the other was with injections.
The studies confirmed all patients experienced weight loss, but no difference in the way they lost weight or felt during the fast was found. (8)
The American Society of Bariatric Physicians warns:
“Numerous clinical trials have shown HCG to be ineffectual in producing weight loss. HCG injections can induce a slight increase in muscle mass in androgen-deficient males. The diet used in the Simeons method provides a lower protein intake than is advisable in view of current knowledge and practice. There are few medical literature reports favorable to the Simeons method; the overwhelming majority of medical reports are critical of it.” (9)
One of the main criticisms is “What do you do after the diet?”
Many people on forums and blogs admit to regaining the weight, with some saying they gain even more, while others disclose that they go back to the injections.
The body is usually stripped of its vitamins and minerals after fasting and goes back to storing fat.
Many people look for a quick fix and forget that they cannot sustain the HCG diet forever.
Advocates of the diet say they learn to portion their food and avoid unhealthy, processed foods.
Another trial randomly selected a group of patients to follow the diet, while another group was supplemented with a daily placebo saline injection.
The protocol was followed for six weeks and it was found that no significant difference in weight loss was achieved.
A different trial had patients follow the diet with placebo saline injections or the diet alone.
The placebo group, on average, lost 22.4 pounds compared to 17.7 pounds lost by the diet-only group.
The saline patients also said that they found themselves to have way more energy than during the other times they had done the diet. (3)