We feed animals a high-energy diet of grain to make them grow quickly, even in the case of ruminants that have evolved to eat grass. But even food animals that can tolerate grain are much healthier when they have access to green plants—and so, it turns out, are their meat and eggs. The food from these animals will contain much healthier types of fat (more omega-3s, less omega-6s) as well as appreciably higher levels of vitamins and antioxidants. (For the same reason, meat from wild animals is particularly nutritious; see rule 31.) It’s worth looking for pastured animal foods in the market—and
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