Given that nutrition is a very complex science and heavily dependent on the state of your digestive system and particular combinations of foods, I don't think t

Given that nutrition is a very complex science and heavily dependent on the state of your digestive system and particular combinations of foods, I don't think there's any one-stop solution for all your nutritional needs. The #1 source of advice should be to listen to your body following a meal. If you feel worse, for any reason - tired, unfocused, unwell - then something about that food probably hurt you. That said, some arguments are definitely stronger and better researched than others, so it's worth seeking them out. One good read I discovered by accident is Jonny Bowden's "The 150 Healthiest Foods on Earth." It contains a lot of surprisingly positive stances on foods with poor public image.