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I've made this observation as well. It goes further than diet, of course. Cars and clothes is another example.

The only thing that could change this behavior is if women selected for mates practicing sustainability.

I agree. If the women in my generation viewed sustainability and a low ecological footprint as attractive, all I'd do is work on global warming and poverty rather than study algorithms to make money.

Other cultural pressures can overcome people's strong desires to please/attract mates, so I'm not sure that's the only way. Cars and clothes as status are a themselves a consequence of culture. If culture moved away from that to something else then it would just be that other thing that mates selected for. But your general point is well taken.

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