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For a few unfortunate people, choline has a dark side. An inborn error of metabolism, trimethylaminurea, causes them to smell like rotting fish when they eat high-choline foods.

Sara D. Brown
Clinton, N.J.

Good point. New labeling that identifies foods rich in choline should help people with trimethylaminurea avoid those foods. –J. Raloff As a reader concerned about my cholesterol and fat intake, I was ready to throw away my container of egg substitute and buy a dozen eggs when I read the article.