I did a school project on Samoans and one of my sources actually said that there were no fat Samoans before 1940. Before then, Samoans were eating f/v, fish, coconut, yams etc. They were also diving into the sea to catch fish and climbing trees to grab coconuts. They build a naval base down there in WWII and thus started to receive cheap and easy-to-ship foods including white flour and inferior tinned meat product (this started their SPAM obsession). Their bodies couldn't handle it. They also eat A LOT as a culture. The conclusion was that Samoans' and Tongans' massive obesity is related to both genetic predisposition and "Western acculturation" which actually means eating shit food and sitting on their ass all day.