Why do all the fattest people live on islands

Here’s a mystery which has been keeping me awake at night recently. Why do people who live on islands, and even more so very small islands, tend to be grotesquely overweight?

I stumbled across this strange apparent correlation the other evening, while sporcling. This is what I do in my spare moments these days, in lieu of a life. Sporcle is a website which offers hundreds and hundreds of quizzes, and has some particularly good quizzes on geography. This is how I know which country in the world has the most renewable water resources per capita (Iceland), which country has the most camels (Somalia), who produces the most apricots (Turkey) and plantain (Uganda), which US cities have seen their populations drop by the largest number (St Louis). And even stuff like which are the nine sovereign nations in the world which have the consecutive letters ‘gu’ in their names.

Go on, see if you can do that: two minutes, starting now.*