I would argue that the US has some fault to why other western nations are getting fatter.
All of the US's worst fast food chains and food products have been exported. In my tiny city a Carl's Jr. Just opened! There is McDonald's, Burger King and Starbucks everywhere. There are also Dunkin donuts in the supermarket as well as oreos. In contrast there arent any Asian or Russian restaurants chains here.
Local foods have become sweeter in order to compete and there are so many local burger restaurants now it's like I have moved to the US.
> US has some fault
That's par for the course, the world does love to blame us for their problems. Then they bitch when anyone suggests we've made some choices in the last 100 years that made their lives noticeably better (hello Marshall Plan!).
> have been exported
That's a convenient spin on "have been imported." Do you not make your own choices? If you don't want the crappy fast food, quit making your own copies of it!
Since it's kind of on point for this discussion, I just thought I'd mention one amusing thing I noticed in London -- you can buy higher calorie McDonalds food there. I could get a sasusage mcmuffin with two patties, which isn't a thing in the US. I almost wanted to do it just for the laughs, but frankly the UK version of McDonalds tastes even worse than the US version. I'm not sure exactly how that's possible.
Y'all should stop importing the shittiest excuses for 'American' food. A lot of us never eat at these places in spite of them being so prevalent. We have a lot of great restaurants, even some of the ones that qualify as fast food.