by Chris Bodenner
Joshua E. Keating runs through the reasons:
What really sets the size of these islanders apart is the size of their islands: Tuvalu, Palau, Nauru, and the other countries on the obesity list are among the world's smallest countries in terms of land area and population. So a single tourist resort, fast-food chain, or trade deal has a much more profound effect on society than it would, say, in India or Nigeria.
Hawaii is a notable exception; it ranks near the very bottom of US states by obesity.