I've heard of a diet consisting only of boiled potatoes and, rice (with salt) and cooked apples which shall help against skin problems possibly caused by allergies. The diet is supposed to be followed for at least a week, better longerafter that other food may be added back again step by step.
Are there any risks or downsides of this diet if performed strictly for about two weeks? What nutrients would be missing and what other food should be added first to it, keeping in mind that it may not potentially cause allergiesallergic reactions?