Michael Pollan's books have cited some interesting research along the lines that food isn't fungible. Well, of course it isn't, but all these "studies" assume a priori that it is.
If our own health is affected by what we eat, why wouldn't the health of food animals (and plants) be affected by what they eat? Studies have shown that the fat of serrano ham (fed exclusively on acorns) and grass-finished beef (the diet of the Maasai who are the example they usually trot out), for instance, have a very different composition from the fat of animals fed on corn (which is not a natural part of these animals' diet).
A corollary to Pollan's "Eat food" would be, "If and when you eat animal products, take them from animals that have eaten food." That would be a very small minority of what's on the butcher and dairy shelves.



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