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Why do you feel dumb when you get sick?

Séamus Bellamy
Feb 19, 2026
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I’ve been sick as a dog for the past week, trying to shake off what I’m certain is the Mother of All Head Colds. When I’ve blown enough snot out of my skull to make space for thoughts, I wonder why I feel so dumb whenever I get sick. The answer is a whack of proteins called cytokines.

In a study of 200 people, published in Brain, Beha…

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