Nutrition: Conversation with an expert

Dr. Walter C. Willett is chair of the nutrition department of the Harvard School of Public Health, a lead investigator for the Nurses' Health Study, and a member of our editorial board. His book, co-written with Dr. Jorge Chavarro and Patrick Skerrett, is The Fertility Diet (McGraw-Hill, 2008).

A reader asked us whether he should switch from olive to canola oil because it has less saturated fat. What do you think?

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