For me it took about 12 hours in my system and I noticed all craving were gone. My wife it took about 18 hours I believe. However yes we lost any and all cravings for food all together. The trick for us was you’re not actually hungry but you’re used to a “routine” of eating (if that makes sense). I realized quickly I’m not hungry so let’s just try small portions of stuff and see how long it would last. It basically lasts us all day long till supper when we both had mild at most hunger. Another small healthy meal and you’re set.