Hyalophagia
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Hyalophagia or hyalophagy (from Greek hyalos = glass + phagein = to eat) is the eating of glass. Primarily a pathological disorder, it is also considered a form of pica. Hyalophagia is very dangerous as the sharp glass may wound the stomach, intestines, and throat as it passes through the system.
Eating glass is also a performance technique common to some sideshow performances. A few of the more prolific "glass eaters" have been Todd Robbins, Matt the Knife, Josh Routh and Michel Lotito.
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