You might think nutritionists are kooks, but they will tell you it is possible to get chapped lips by not getting the right nutrients for a week. It is like starving yourself if you do not pick the right balance of foods to eat on such a restricted diet. If this person was following a meal plan given to him by a nutritionist/dietician or in a book written by one, I would think something else was the problem. Personally, I am going to see a nutritionist so I get the right balance of foods since I have concerns about not getting enough nutrients.