From my personal experience, 1 week. But I found that many foods I THOUGHT were the problem weren't...it was quantity and not necessarily a food. ALthough I did notice that when I was eating "bars" they would cease my weight loss completely...probably due to the glycerine. Nuts, which I love and eat, have to be eaten in moderation by me...1 oz per day max. Same with peanut butter...2 tbls max. You get to know your body and know how much of a food item you can eat "safely". Good luck.