Purefit Keto Cheat! Yes you heard me, cheat. I wouldn't recommend this until you have successfully completed the first two weeks of the Atkins Diet. Once you have completed the diet for two weeks, pick a day and cheat. When I say cheat, I don't mean go nuts. I mean have carbs in your meals. Eat pizza, grab a doughnut, or make some pasta for dinner. You are only hurting yourself if you go overboard, so keep it all in moderation. It is great motivation for a tough week. In addition to rewarding yourself for your hard work, you are also shocking your body. If your body gets used to the Atkins Diet, you will plateau fast. Shake things up, shock your body, and grab a slice of pie. One slice!