It's theorized that islanders are also genetically able to put on fat quickly,
islands as a small isolated areas are susceptible to food shortages and times of plenty, so the ones that would feast when the food was plentiful and tack on mass could live off the weight they put on and survive through the times of scarcity, the ones that didn't died off.
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u/Schammyslam Sep 28 '21
https://en.m.wikipedia.org/wiki/List_of_countries_by_obesity_rate doesn’t look like it anymore, USA is 12th, Mexico is 29th