Corn is an efficient way to get energy calories off the land and soybeans are an efficient way of getting protein off the land, so we've designed a food system that produces a lot of cheap corn and soybeans resulting in a lot of cheap fast food.
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A cow out on grass is just an incredible thing to behold... Cows and other ruminants can do things we just can't do. They have the most highly evolved digestive organ on the planet, called the rumen. And the rumen can digest grass. It takes grass, cellulose in grass, and turns it into protein, very nutritious protein. We can't do that.
Animals raised on corn produce fattier meat, but it's not just that it's fattier, it's the kinds of fats. Corn-fed beef produces lots of saturated fats. So that the heart disease we associate with eating meat is really a problem with corn-fed meat. If you eat grass-fed beef, it has much more of the nutritional profile of the wild meat.