One book that presents its ideas on healthy eating and has data to back up its claims is Real Food: What to Eat and Why by Nina Planck. It promotes the consumption of fresh fruit and vegetables, use of butter in cooking, and eating eggs, beef and fish.These items are typical to most books that promote healthy eating. However, the author also suggests some pretty radical notions. Ms. Planck makes a persuasive argument for the consumption of raw milk and fat such as coconut oil.
In the back of the book, a listing of places to find to find real food and further resources and readings are included. So check out this book, it could change your perceptions on food.