I'm not sure what the argument was in pointing out that the participants in the study I linked were obese. It was a weight loss study.
Anyways, aside from studies, all I have is my anecdotal evidence.
I've lost 50 lbs. I have an uncle who has lost over 60. I also have had a few friends/family members try it and not be able to keep it up. It definitely isn't a magic pill. It still works on the same principles as a normal diet. You eat fewer calories than you use. Keto just helps me eat less because I am not eating 'empty carbs'. I can eat steak and broccoli/cauliflower/asparagus for supper and be full until lunch or supper the next day. It is the level of satiety that helped me lose weight, because I don't eat nearly as often as I used to.
I had blood panels taken before I started, and after I finished my 'strict keto' phase. Every single metric improved, some incredibly so. I ended up getting a panel done about 3 weeks into strict keto and it did show that my bad cholesterol had increased a little bit, but my doctor told me that it is normal and would return to normal (and then go down further) in the next few weeks.
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