If you stress out about every little thing, your brain is going to forge and strengthen connections, over time, making it reactive and anxious. If you expect the worst in every situation and are a pro at spotting the downside in all cases, you’re reinforcing this kind of negative thinking in your brain every time you engage in it.
One study confirmed that depressed people had more activity in areas of their brains corresponding to pessimistic thinking, meaning that a depressed brain expects the worst, which only increases that brain activity and strengthens those neural connections.
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