In addition to the solid Cortisol and dopamine answers, one [famous study decided that self-control is a limited resource](https://www.theatlantic.com/health/archive/2012/04/the-chocolate-and-radish-experiment-that-birthed-the-modern-conception-of-willpower/255544/). When you are in stressful situations, handling them often requires self-control, like if your boss treats you unjustly and you have to take it. If you’ve used up your limited self-control on stressful situations, you have less to apply to eating properly.
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