It really strange... if you browse the net and look for things to avoid by various forms of medicines (Alopathy, Homeopathy, Herbal, ayurveda, chinese medicine etc etc... at the end you will be left with only 'WATER' :). So think its better to eat what you like and healthy to some extent... :)
I agree with Ramdein, all the websites that claim they have a cure for vitiligo, have different opinions about a diet - and you're right that just boils down to just water - unbeleivable, why is it so hard for someone to come up with a real cure - I think this desease is left to the back bench and not really focused on.
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http://www.vitiligofriends.org/forum/topics/do-diets-help