I read your other post and you are in the same ball park I was in, maybe even leaner. I am only 44, the first 33 days brought 26 pounds of loss. Mind you that had thanksgiving in there, a bunch of mistakes, and the general learning curve.
At 51 days do you feel or understand what fat adaption is yet?
You are practicing IF and using MCT so your keyotnes are probably spot on at this point based on your loss. Its a little early to try EF(extended fasting) if you want, but that despite what others have said did help me pull my skin some. Is it a miracle worker, no, but it did help without question. The other bonus is for me that my hunger pretty much died after the second fast over 24 hours and I felt really good in general, plus I noticed some old scars have healed away.
I have gone as long as 80 hours, working my way up. These EF’s broke a stall point for me and although you do gain a little back I have overall lost. Now to be honest my goals have changed since I started the diet and now I am into body art more than fat regulation. I want to look good for the ladies.
I started EF at 90 plus days, not exactly sure, but a good month into fat adaption. The transition was mostly mental for me at that point. 18 hours is still rough for me but I try and make that time frame when I am sleeping.
I did do one fast(24 hours only) at about 4 weeks in and I felt horrid, I was not fat adapted yet, I was cutting my calories to low and I think they both make all the difference in the world.
You will not gain anything back if you stick to this WOE in an overall (stock market) sense.
Don’t forget to adjust you macros as you go along and you will need to change things up at some point.
There will be days you gain some back but I have always trended down albiet sometimes slowly. I am 6 months on this WOE yesterday, and I consider myself starting ketosis a week later. That was about 60 pounds ago( I am on vacation currently so who knows at the moment) and 12-14% body fat.