I've read some books, including the 80/10/10 Diet by Doug Graham, The Reverse Diabetes Diet by Dr Neal Barnard and The China Study by Dr T. Colin Campbell. But with relation to free and easily accessible information, these are my favourite websites/forums in relation to health and nutrition.
30bananasaday.com
nutritionfacts.org
drmcdougall.com
pcrm.org
ravediet.com
notmilk.com
forksoverknives.com
cronometer.com (also an app you can pay for but you can use the website too)
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