Yale researchers look at all the fad diets and find one that works.

But what about the Paleo diet, which encourages meat eating? The authors conclude the “aggregation of evidence” supports meat eating, as long as the “animal foods are themselves the products, directly or ultimately, of pure plant foods—the composition of animal flesh and milk is as much influenced by diet as we are.” That’s entirely consistent with the Paleo push for meat from pasture-raised animals, and brought to mind a study I wrote about late last year finding that cows fed on grass deliver milk with healthier fat profile than their industrially raised peers.