The best resource I've found on nutrition, and it's totally free, is PCRM - Physicians' Committee for Responsible Medicine. They support a nutrition plan that's without any animal products, but if you wanted to add lean animal protein to what they suggest, you'll get 'clean eating'. What I admire about them is that they provide tons of information, recipies, etc. with no charge - unlike other 'experts', they have medical/scientific backing.
I know lots of folks don't like the 'v' word (vegetarian/vegan), but you can take from the site what you find helpful and go from there.
Good luck to you !
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