For whole grains, I consume natural whole wheat berries, brown rice, millet, and flax seeds. I make hot and cold cereals with these, with my food processor. At times, I'll have potatoes, mixed with boiled onions. (There. That's my five.

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I'm not sure if that is the best for everyone, but that's what are my favorites. Some people don't seem to like to have potatoes in their diet....
The rest of my diet is a mixture of fruits, nuts, seeds, dairy products, and vegetables. Sometimes I'll have a small portion of processed (very low sugar) food, and meat. It's too hard to be a purist in our fast-paced society, but by eating healthy as much as possible, it can make a big difference.