I don't know if this is in the right spot, so if anyone wants to move it go ahead.

Earlier in the year I did some traveling around asia (China, Singappore, Japan) and I noticed that their diet is quite high in carbs, lots of rice, noodles, dumplings etc.

I was just wondering how come (in general) that these countries have almost no obesity problem?

From what I saw they eat a lot of refined/unrefined carbs.