stealth fat
n. A type of fat — known officially as trans fatty acids or trans fats — that doesn't appear on food nutrition labels. (Also called phantom fat.)

Example Citation:
"  'At this point in time there is unanimity that trans fats are a problem,' said Dr. Walter Willett, chairman of the nutrition department at the Harvard School of Public Health. 'We sometimes refer to them as a stealth fat because you eat them and they are not on the label.' "
—Sheryl Gay Stolberg, "F.D.A. Calls For Listing 'Stealth Fat' On Labels," The New York Times, November 13, 1999

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