Angela
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Generally speaking, populations that did not get most of their calories from cereals before the European colonisation are more prone to obesity when they adopt the modern Western diet. That is the case for Pacific islanders (who traditionally ate almost exclusively fish, seafood, vegetables and fruits), Native Americans (a bit less Andeans and Mexicans, but not that much), and some African populations.
Hispanic is a misleading term because it can apply equally to people are mostly of Native American ancestry, to others who are mostly of European (Spanish, Portuguese) ancestry, and yet others with mixed ancestry.
In the southern USA, many peopled classified as non-Hispanic White have a few per cents of Native American (usually Cherokee) or Black African ancestry. That can be up to 15-20% and not be visible physically. The actual percentage doesn't matter. What they should check is which version of genes processing carbohydrates they have (it may not be simply alleles, but the number of copies of some genes, which is not yet tested by companies like 23andMe).
One of the main reasons of obesity in Europe is alcohol consumption, which is way higher than in the US. Italy has the lowest alcohol consumption and one of the lowest obesity rate. The Irish, British, Czechs, Latvians, etc. are all well known for heavy drinking, especially men. Another factor is greasy food, especially in northern, central and eastern Europe. That is not necessarily fast food. Just look at traditional German and Polish meat dishes.
I agree with much of that except for one caveat. From the people I know who are Cubans and Venezuelans, they are usually only a few % minority in ancestry, and they invariably identify as "white" socially and on the census. On the flip side, multiple studies have been done on the mass of Hispanics in the Southwest, and the vast majority are Mexicans who are at least 50% Native American. The Central Americans are even more Native American. As for Caribbean Hispanics, they have high percentages of both Indian and African ancestry. Native Americans, who are centered in the Mountain States, have among the highest obesity rates in the world, some as high as Polynesians, for the reason you explained.
So, when looking at the obesity map of the southern United States, it helps to remember that close to 50% of the population in those states is black, and the latter have among the highest obesity rates in the U.S. In Texas and some of the southwest, half the population is Mexican in ancestry and Mexico has the second highest obesity rate in the world according to some studies. The midwest, which is the second highest area in terms of obesity, is largely Germanic in ancestry, so perhaps inherited cuisines and lots of beer are factors, and although I don't have the figures, by driving through, fast food restaurants are ubiquitous. As for California, they have a lot of Mexican Americans as well, but it's balanced by lots of East Asians. The upper northwest is white bread mostly, except for a few pockets.