I agree! I tried the Fung program - I think it was around 2016. I did it with LCHF. I thought it was great, until it turned into a rollercoaster of weight loss/weight gain. It does not work for me, and I think it was because of the low protein nature of LCHF plus so many hours of not eating!

My daughter did it with me too, and it put her off completely of dieting and low carb both. She won't even try anything else, she says it is futile (just results in gaining it back) and ignores my high protein diet too now.

That did a lot of damage unfortunately, I wish I had never tried it because of the way my (adult) daughter reacted and her conclusions.