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Use "faddist" in a sentence
"He will be called faddist, narrow, sour-visaged, and so on and so on."
"Yet "Great Soul" also obligingly gives readers more than enough information to discern that he was a sexual weirdo, a political incompetent and a fanatical faddist—one who was often downright cruel to those around him."
"(You guessed it, her pet doctor Mehmet Oz is another food faddist.)"