I used to fast 18 hours every day, all week for 4 years. It did nothing but slow my metabolism down further.

Now I chug down 250ml of protein rich milk every morning to keep the protein flow active all day and I'm noticing a slight difference. It's only been 1 month though and I wouldn't call my conclusions definitive.

Definitely eat less. I am 191cm by 87kg and I plan to stabilize myself to 1800cal/day.