[Omnius]

IF when discussed usually means fasting daily. So maybe your food window is only between 4 - 8 pm. The anti-aging stuff you saw/read (if its the same that i did) was more about actual fasting where you might not eat everyday and here they did find some linkage to aging.

[newnewpdro]

I am under the impression that IF usually refers to the now popular (thanks BBC) 5:2 schedule. This is the context I've most seen/read about the topic, which often includes the talk of anti-aging and autophagy.

But this is all very muddy waters since it's fad diet territory and unscientific claims abound.