A new study explains why hard mental labour makes you feel exhausted. This is why deep focus and mental stress works up an appetite.
However, it isn’t just the muscles that are visibly working – your legs when you run or your biceps when you curl – that require energy. “Your brain thinking, your liver and kidneys filtering, and your bowel absorbing and digesting all require energy,” says Medlin.
So that time you spend in deep focus, stressing over your job or simply doing a lot of mental work requires more fuel than you might think. “Your brain is actually your ‘hungriest’ organ. It is only 2% of our body mass but it uses 20% of our energy,” says Medlin. or are under a lot of pressure, or when we’re in complex social situations, our brain is working even harder.”, participants who had to complete word or number tasks had sharper declines in blood glucose levels – a sign of energy expenditure – than those who had to complete a key-pressing task. Researchers concluded that “a period of intense cognitive processing […] may be linked to increased neural energy expenditure”.
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