Compare the GI and GL of their carbohydrates with the GI and GL of the typical American carbohydrate laden diet - sugars, HFCS, refined carbohydrates, etc - and you may find that one of the contributors to obesity is the TYPE of carbohydrate consumed.

Also, I bet they do a lot more physical exercise in Kitava than your typical american.

Try posting the other stats from the study as well:

. Less than 0.2% of the caloric intake came from Western food, such as edible fats, dairy products, sugar, cereals, and alcohol, compared with roughly 75% in Sweden



. The elderly residents of Kitava generally remain quite active up until the very end

You can't just isolate one factor and use it to debunk all sorts of stuff. You need to take everything into consideration.