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10 extremely unusual allergies

Glass of water

Photo: Ryan McVay/Getty Images

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All food and drink – except water

Australian Kaleb Bussenschutt has a condition that's so rare there isn't even a name for it. If he ingests anything aside from water, ice and one specific brand of lemonade, he has severe and painful stomach problems, including vomiting and stomach ulcers that have put him in the hospital. To get the nutrients he needs, Bussenschutt is fed formula 20 hours a day through a tube, and has to maintain an amazing amount of self-control around real food