You don't lose crazy weight because of a pregnancy hormone (Anyone who has been pregnent can attest to that). You lose the crazy weight from a starvation induced diet. You lose mostly water and muscle. Once you drop your calories ro severely (thanks, HCG Diets) your body begins to breakdown the fuel-burning tissues in your body to conserve energy to keep your vital organs running. This fuel-burning tissue is known as Muscle. Your body can't keep both the muscle AND support life. Many cases have shown people to go into not only kidney and liver failure, but also heart failure. Pretty much it shuts your body down, but dang it, you'll weigh less. YOu'll also end up with a Higher Body Fat% in the end too (because the body clings on to the fat for dear life). HCG Diets also don't recommend exercise programs. It has a little something to do with not being safe bc you'll pass out from a lack of food energy and low blood sugar.
Just like any diet, they only show you the "success" stories, never the real, day-to-day stories of what really goes on behind the scenes. They never tell you about the health concerns, hospitalizations, and those that gain every ounce back and then some. They only tell you it's "safe" and "all natural". Just so we know how "safe" these "all natural" products are, lets keep in mind that Cocaine is also "all natural". You can can lose a ton of weight while consuming Cocaine- that was a popular weight loss method in the 80s for Yuppies. How safe is Cocaine? How safe is Anthrax, the Black Plague, Tape Worm... things that are "all natural".
There are no quick fixes in life that last. And no Quick Fix is worth risking your life and health. Anything that is worth having is worth the work. You are an adult and can certainly choose which ever method, there are 1000s out there, that you feel confident in. But you've aked about results and safety. The results... read the fine print it's not the Golden Ticket they claim. The safety, well you tell me. Hypoglycemia, organ failure, muscle loss, dehydration, fatigue, brain fog, the shakes... are those safe? Is taking Cocaine safe? I don't know personally as I wouldn't risk it to to make the scale my BFF. I'd rather have the fat ass and a wear a double digit size knowing I'm actually healthy and oh, I don't know, alive.