People repeat behaviour that leads to flooding their brains with pleasurable chemicals. The short-term reward loop acts over hours to years and the long-term reproductive success loop over generations.

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It's interesting when people make comments about celebrities' weight gain or lack of weight gain as if they're a medical professional that's treating that celebrity. Like 'This doctor does not treat Jessica Simpson but thinks her weight is unhealthy.' If you don't treat her then how do you know?