We are built to crave foods high in sugar, salt, and fat because they provided our ancestors with energy, vital nutrients, and stored fat to help them get through times of food shortage. It was beneficial for them to eat as much of these as they could find because they were often scarce.20 But the modern world has hacked the reward systems that were so beneficial in the ancient world, boosting the content of these craved compounds in the foods we eat to maximize addictiveness. Combined with the sedentary lifestyle the modern world affords, these chemicals no longer serve their original
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