I think it's a huge part of it. Someone like me needs to intermittently fast even if just slightly. When I eat late at night I end up just spooning almond butter in like it's Kozy Shack pudding and I wake up still full, and often a pound or two heavier. I try to eat just breakfast and dinner (dinner usually at 7pm, 6 on weekends) but sometimes on weekends I walk so many miles I need a lunch. I didn't used to need to worry about calories but my weight is so comparatively low that now I do. I walked 10.5 miles today and had a can of tuna dumped on some romaine and broccoli sprouts for lunch.