My personal experience with IF is that for me it'd require quite strange timings to work. I need breakfast, not because I'm hungry in the mornings but because if I don't eat breakfast my insulin sensitivity will just go away for the rest of the day. I know IF is supposed to increase insulin sensitivity but for me in some cases it causes the opposite. The effects of breakfast on insulin sensitivity have also been studied and it would seem especially for diabetics like me eating breakfast is a viable choice to control insulin sensitivity for the rest of the day