What form of IF do you do? I’m considering it for the New Year, as the protein sparing modified fast takes tremendous effort. Zig-zag works for me if I can do heavy lifting in concert with it, but logistics and my work schedule make that difficult to do.
But for me, it really took off when I moved up to doing 48 hours or 72 hour fasts followed up with a low carb feed (basically a big meal) and then right back into fasting for another 48 hour - 72 hours. That's when my numbers became perfect, the weight was flying off, and basically it was effortless because I was "fat adapted", meaning my body preferred using the ketones to sugar and as long as my body was making ketones I didn't get hungry. If I did eat a bunch of carbs, I filled up instantly and felt like hell and then felt like I was starving for days after until i got back to fat adapted. No easier plan than "don't eat". Did that for about five months, lost 80 pounds. Getting back into it now after the holidays screwed everything up. Starving now because I ate tons of carbs on Xmas. So.... hungry ....
Lots of people just do different variations. One meal a day ammounts to a 23 hour fast every single day. That works for a lot of folks. Others just skip breakfast, that ammounts to less food AND a 16 hour (roughly) period of not eating. The goal is to let insulin naturally sink to a low level and stay there as long as possible, that's when the body cannot store fat and cannot stop you from burning it. So they longer you fast, the longer the insulin stays low and they longer you are in fat burning.
I saw a video on Netflix about keto where parents of severely autistic kids were transitioned off the standard american carb diet and onto keto. These were kids who were non-verbal, lethargic or violent. After a month or so, the two kids featured had much more level behavior and began speaking, responding to questions, things like that. Miraculous. But the brain loves ketones, it will survive on sugar but it LOVES ketones.