Margaret A.WinkerMD, Deputy EditorIndividualAuthorPhil B.FontanarosaMD, Interim CoeditorIndividualAuthor
To the Editor: Olestra, the Food and Drug Administration
(FDA)–approved fat substitute contained in snack foods, lists an unspecified
amount of vitamin K as an additive.1,2
This raises concern because patients taking warfarin are typically educated
about the need to maintain a consistent intake of foods containing vitamin
K. Thus, vitamin K found in this unexpected source warrants further assessment.
Harrell CC, Kline SS. Vitamin K–Supplemented Snacks Containing Olestra: Implication for Patients Taking Warfarin. JAMA. 1999;282(12):1133-1134. doi:10-1001/pubs.JAMA-ISSN-0098-7484-282-12-jbk0922