adult-onset—diabetes in their late 30s. In contrast, the average age of diagnosis in the U.S. is 54. Sure, Cambodians now eat more and do less physical work than they did in decades past. But that's not enough to explain their unusual diabetes rates, PRI reports. Something else is happening.
Another thing mentioned is that the Dutch who were starved by the Nazis had smaller children.  The interesting part is that those children also had smaller children.
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How Nutrition In One Generation Can Change The Genetics Of The Next
A Cambodian case study finds that people developing diabetes today have parents who went hungry in the 1970s.
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In livestock this is called "fetal programming" and the effects are somewhat better known and documented.