They may think they have the same diet, but I bet they're eating less, simply due to different portion sizes. If they're going to the same type of restaurants a

They may think they have the same diet, but I bet they're eating less, simply due to different portion sizes. If they're going to the same type of restaurants and ordering the same thing as in the US, they're almost certainly consuming fewer calories simply because they're getting less food pr. order. Even when buying food at the supermarket, portion sizes can differ dramatically. "1 pork chop" or "1 chicken breast" is much smaller on average in Sweden for example than in the US.