I did a lot of fasting to get at goal and stay there for the first year. Mixed the fasts up, lots of OMAD, 36 hrs. and some 3/4/5 days. I’m female and that worked out great for me YMMV.
After many yrs. at goal weight, I did add a few lbs. then did OMAD and 36 hrs. fasting to drop back to goal. What has been different for me is I used to lose on a diet and then regain and keep weight on no matter what I did. I have been stable for many years now and even with this blip, I am right back where I want to be.
For me, shorter fasting keeps my ketones up, after 36 hrs they can drop. On a day to day basis, I eat lots of protein, moderate fats, and low carbs. I get less hungry but not everyone does, some need more fats, but I found upping protein worked better.
Experiment and see how you do with more fat over a week or so. As we are all different in our needs you have to try things to see what works best for you.