osteoarthritis has been around for millions of years (even some Neanderthals were afflicted) but our chances of getting this disease at a given age have more than doubled since World War II.71 Today, more than 25 percent of the U.S. adult population has been diagnosed with some form of osteoarthritis, most commonly in the knee.72 As always, the genes we inherited affect our susceptibility to sarcopenia, osteoporosis, and osteoarthritis. But because our genes haven’t changed over the last few generations, the chief culprit of these mismatches must be environmental change. Modern processed diets
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