I like this site, but it is a bit hard to navigate.

As someone who struggles to maintain the proper balance of nutrients in my diet, I found this material to be helpful in pointing out the correct balance of carbohydrates, protein, etc, that one should incorporate into their daily diet. Lots of links to info on protein, carbohydrates, vitamins, minerals, and more!

There is a lot of good information here on food nutrition. It covers the different food groups plus various information about a healthy diet and lifestyle. There are quite a few links to click through, but the information is worth it.