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Most restaurants I've been to (in the US) serve me approximately twice as much food as a actually want. It's so wasteful, as it means that I'm throwing away half of the food each time.

this is key insight - large portions tend to be mostly massive quantities of cheap carbs like rice and potatoes. the expensive proteins tend to be very "sensible" portions lol.

Mainly because Europe has caught up, as evidenced by many peoples' waistlines this side of the pond.