Healthy brains can reach 105°F

brain temperature fluctuates greatly by time of day and brain area, but is usually warmer than the rest of our body.

MRC Laboratory for Molecular Biology in the UK led the investigation. They studied brain temperature data from critical care patients and healthy individuals 

Morning, midday, and nighttime temperatures were obtained from both groups.

Both groups' average brain temperature was 101.3 F (38.5 C), which was greater than their mouth temperature. Readings varied widely

Brain temperature was lower at night and greater in deeper areas than near the surface. Women and the elderly had higher temperatures.

"Brain temperature dips before bed and increases throughout the day. This everyday variance may affect long-term brain function

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