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Does anyone know of any living ascetics? I remember in a lecture Shaykh Hamza Yusuf saying he knows someone who subsists on nothing but milk. Also, please include where/how I could contact them.

If you're talking about Murabit al Hajj, he didn't live off of milk alone. (Sorry, if this is not who you are talking about, but when I read your post he immediately is who came to mind.)
After the sun rose and reached the level of a spear above the horizon, he would pray the sunrise rak’ahs and then return to his tent where he would have some milk brought fresh from a cow. He would always pray four rakahs before and after the midday prayer and then return to his tent where he would teach until afternoon. He would usually have a small amount of rice and yogurt drink that is common in West Africa. http://sheikhhamza.com/biography/#_Toc309220673
edit: more info here: http://www.sunniforum.com/forum/show...-in-Mauritania