I have been eating keto since May 2017, which included some intermittent fasting. I lost overall about 50 kgs in 3 ranches over 2 years due t visiting the UK to see family and being unable to reliably find decent keto food.
In my opinion, IF is about the worst way ever to lose weight. It needs enormous self-discipline if you break the keto routine regime.
IMHO, the only way to lose weight effectively, after 7 years experience, is to establish a strict regime and do not vary it one jot.
If you vary it much, you'll pile it on. Monotonous, yes, but do you want to be 100 kgs plus and stuff your face with what you made you fat in the first place or bite the bullet and eat selectively and well?
I started at 102 kgs, and I'm now 65 kgs but with 3 blips when I went to visit family in the UK and piled on between 6 - 12 kgs in 4 weeks! Never, ever again.
Willpower and devising a workable eating routine and sticking to it is the only effective way. Those who do IF and shovel 'normal food' down their mouths in the false belief that they are helping themselves are on a hiding to nothing. 'Helping yourself' to what you want for a short while' is just a false premise and doomed to failure. They are just being lazy and unproductive.