I tried a seven-day fast two weeks ago, for health reasons and also to determine if I had any allergies. The first two days was only lemon water. Then I did not consume alcohol, sugar, wheat, corn, preservatives , non-organic vegetables. My lips peeled through two cycles in six days so I stopped fasting. There was no change in either the rate or amount of peeling. If you try it, it is recommended to take a multivitamin, antioxidants, acidopholus, and milk thistle.