The first week on the program may be challenging due to all the changes you're making. This week is typically when people experience withdrawal symptoms from sugars, caffeine, and chemicals found in foods.
The second week is when adaption happens inside, according to Dr. Junger. Some patterns like sleeping, bowel movements, and appetite may be disturbed. On this plan it typically takes 10 to 14 days to repair the average intestinal flora, and it's completely normal if you aren't you aren't feeling your best. You may also experience bad dreams and headaches, and it's advised to not take nonprescription medicine to help manage headaches. Energy surges and weight loss are also common, and it's advised to not cut calories too much because the body will hold on to fat because it thinks it's entering starvation mode. The USDA dietary guidelines recommend that adult women consume 1,600 to 2,400 calories a day and adult men consume 2,000 to 3,000 calories a day. Dr. Junger advises eating plenty of healthy fats and proteins in order to form lean muscle mass and maintain a proper metabolism.
During the third and final week of Clean is when you should start feeling great. According to Dr. Junger, you may notice that your skin is glowing, your clothes are fitting looser, and pesky symptoms you may have been dealing with in the past are going away.