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IN OTHER WORDS, the robustness of meat-eaters and the long lives of meat-abstainers are two sides of the same biological coin. It all depends on how you define healthy. Does healthy mean being in a great mood and being fertile and stronger at a younger age, or does healthy mean delaying cancer for a couple of years and hanging out with your great-grandchildren?

CREDIT: IAN GWINN / GETTY IMAGES

NON- FICTION 100 Million Years of Food: What Our Ancestors Ate and Why It Matters Today by STEPHEN LEHarper Collins ( 2016) RRP $ 39.95