> Obesity is just one example of how the internet, especially sites like Reddit, tend to exaggerate the problems of the United States while downplaying the positives of the country

I don't think the rate of obesity paints the whole picture here. The first time I visited the USA, I wasn't so much surprised by how many people were obese (they weren't that common), but by exactly how obese the outliers were. In my country, you'd ~never see someone so obese that they needed a cart to move around, whereas in the USA that wasn't uncommon.

I think the saliency of that is what surprises people more than the actual frequency of obesity.