“But for most of the leading causes of death, the science shows that our genes often account for only 10–20 percent of risk at most.15 For instance, as you’ll see in this book, the rates of killers like heart disease and major cancers differ up to a hundredfold among various populations around the globe. But when people move from low- to high-risk countries, their disease rates almost always change to those of the new environment.”
