There's a lot of scam diets where they have you starving yourself so that you ultimately end up failing, putting on even more weight, feeling terrible, then buying another book/course/whatever. LPT: If it came from something you had to pay for and not your doctor, it's a scam.

Thats how I did it when i weknt from 102kg to 75. I cut out most easily replacable sugar (in coffees and fruit juice), and fasted 1 day a week and 1 meal a day. Beyond that, I ate whatever I wanted. Sometimes i would fast for 3 days in a row, but that was more for my own interest than anything. Once I did 6 days in a row, but I dont recommend that, it took ages for my bowels to go back to normal.

But this only worked for be because I like fasting. I like feeling hungry and empty. I like forcing myself to slow down to avoid energy crashes. It also frees up a lot of time that id otherwise spend shopping, cooking, eating, and cleaning up.