Researchers at the University of Bristol in England found that drinking ice-cold water can temporarily lower your brain power as much as 15% (about 10 IQ points on average).
This is because energy (and blood) is diverted from the brain to the stomach in order to warm the water. Although I’m sure if you’re drinking ice-cold water, brain freeze might have something to do with it.
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Not sure if you believe it? Grab an ice cold drink and take an online IQ test to find out how you rate. Just remember, the next time you’re writing an exam or pulling an all-nighter, remember to drink something at room temperature to maximize your brain power!
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