The practice or principle of gluttony; excessive eating as a lifestyle or philosophy.
From 'glutton' plus the suffix '-ism' (from Greek '-ismos'), which creates nouns for practices, doctrines, or systems. This formation mirrors words like 'alcoholism' and 'vegetarianism.'
The '-ism' suffix transforms behaviors into ideologies—calling something '-ism' makes it sound like a belief system rather than just a bad habit, which is why 'gluttonism' sounds more serious than 'overeating.'
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