IF can just mean skipping breakfast or something. Apparently I've done it for years without meaning to by just often not being in the mood for breakfast. I wouldn't call it "real" fasting in the way you'd usually think of fasting, though maybe it does have health benefits. I'm skeptical—seems far too mild and too similar to ordinary eating habits to possibly do much, aside from maybe resulting is slightly lower overall caloric intake, which admittedly would be beneficial for most people, however that's not really a special effect of fasting per se, though it could still be an effective way to achieve it, which is fine.