Your old brain functions in scarcity mode; it’s always worried about starvation. If you see a doughnut, your old brain impulsively tries to pounce on it, thinking, Calories! Survival! You might remember the odd runs on commodities—toilet paper, flour, pasta—at the grocery store at the beginning of the COVID-19 pandemic. If you’re at the store and you see someone’s cart piled high, you rush to grab whatever is left, even if you have plenty of it at home. In contrast, your new brain says to your old brain: “Hold off a minute. You just had lunch. This is not healthy, and you’re not even hungry!”
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