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Provisional Recommended Soy Protein and Isoflavone Intakes for Healthy Adults: Rationale

Messina, Mark PhD; Messina, Virginia MPH, RD

Food Science

Health professionals and consumers are seeking guidance regarding appropriate soy intake levels. Several different types of evidence that support of our recommendation that adults should consume 15 g (range 10–25 g) soy protein and 50 mg isoflavones (range 30–100 mg)/day are presented.

Mark Messina, PhD, formerly with the National Cancer Institute, has organized and chaired all four international symposia on the role of soy in preventing and treating chronic disease and is currently president of Nutrition Matters, Inc., and an Adjunct Associate Professor in the Department of Nutrition at Loma Linda University.

Virginia Messina, MPH, RD, is an Adjunct Assistant Professor at Loma Linda University and a nutrition consultant. She is Senior Editor of Vegetarian Nutrition and Health Letterand is coeditor of a textbook on vegetarian nutrition. She also frequently acts as a consultant to the soy food industry. Corresponding author: Mark Messina, PhD, Nutrition Matters, Inc., 439 Calhoun St, Port Townsend, WA 98368 (e-mail:

© 2003 Lippincott Williams & Wilkins, Inc.