Lose 40 pounds in just 40 days? HCG diet has backers, detractors
Then, Patti Dingler found the HCG Diet. She eats only 500 calories a day, and she and her husband have bumped up their walking regimen to 5 miles daily near their home in Wise County, Texas. Definitely a recipe for weight loss.
She shed 25 pounds in her first 30 days on the diet. Ref. Source 3
That is a really strict regime that I've only read bodybuilders going up for contest will do, but this is nothing new:
So really it is probably on used at best for a short period of time. That's a pretty crazy weight drop though, I don't need it but my wife probably thinks that she could use it. I don't think that she has the willpower to restrain herself from certain foods.