Here is a very interesting question that nobody can explain, they try to explain but can't justify it, some things in this world really have no explanation. I can only speak for SEA countries which there are 11 of them but I will speak on certain extra countries as well , such as China, Japan and South Korea which are not SEA.
Of course there are fatty's here but very rare and I would like an explanation. Thailand , Laos, Timor- Leste, Indonesia, Singapore, Malaysia, Brunei , Myanmar, Philippines and Campuchia have a lot of obesity, lets throw in China, Japan and South Korea, lots of obesity there. Now....
Campuchia and Myanmar not a lot but some but here in the Holy land, aka land where Christ once roamed, it is very rare and their diet is not the best. Lots of fast food, lots of rice, , tons of alcohol , but Viets are in very good shape, even when the girls have babies, their bodies go back to normal, never seen anything like it, of course , there are exceptions but it really puzzles me, all the neighboring SEA countries with the exception of Campuchia and Myanmar obesity is all over the place and nobody can come up with an explanation.
@BMR Genie @Tanko