Are there any good websites (or books) about nutrition?

[Lorna]

Every time we sit down to a meal I get asked 'Is such and such good for you?' and 'What does vitamin ... do?'.
Is there anywhere I get get answers?
Thank you in advance!

[Tea Party Girl]

As a daughter of a nutritionist, the best book I've ever read along those lines (and between my mother and I we've read many!) is the recent 150 Healthiest Foods on Earth by Jonny Bowden.