Currycel genetics. Partly due to the long term genetic effects of agriculturemaxxing rather than being hunter gatherers. Partly due to the fact that they live in a less difficult warmer climate, which reduces the amount of genetic selection. Partly due to famines between the 16th and early 20th centuries which supported fat-retaining "famine genetics". On top of that, former vegetarians switching to a high carb, high fat diet.