I think IF is great.

I'm currently abroad and can't stick to my normal insanely spartan diet. About once a week I start to feel a little off: knotted stomach, lethargy, etc. I do a short fast, usually only 20 hours or so, and go for a long walk, and by the end I'm feeling sharp and ready to eat subpar food once again!

When I'm home in the States I eat an insanely strict diet. When I fast I don't notice any improvement in mood or health. I still IF from time to time though, just because there seems to be some evidence it might be healthy, and because, hell, sometimes it's nice to not have to cook myself three meals every day.