"I have to say that being a vegan in 1986 or whenever was a lot different than being a vegan in 2012. You'd go to health foods stores and basically your choice was between Mung beans and nutritional yeast, and that's about it."

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The ideal human diet looks like this: Consume plant-based foods in forms as close to their natural state as possible (“whole” foods). Eat a variety of vegetables, fruits, raw nuts and seeds, beans and legumes, and whole grains. Avoid heavily processed foods and animal products. Stay away from added salt, oil, and sugar. Aim to get 80 percent of your calories from carbohydrates, 10 percent from fat, and 10 percent from protein.

— T. Colin Campbell