Socioeconomic factors play a role as well. The cheapest foods are usually the ones that are the least healthy, eg: McDonalds — feed your family of 6, 12 cheeseburgers for $6 bucks and you don’t even have to waste time cooking/cleaning!!
I’ve read that evolutionarily, Pacific Islanders have developed digestive systems catered towards fish and plant processing. It wasn’t until the introduction of fatty red meat in the last couple hundred years that the stereotypical Samoan/Hawaiian sumo-size came to be. Their digestive systems are just not evolved to efficiently process all of the fats. Any evolutionary biologists in the house know if this is true or not?
