Dehydration Shrinks Your Brain Fast

Scientists just discovered that your brain literally shrinks when you're dehydrated,

and it happens faster than you think. Researchers at Cambridge found that just 90 minutes of moderate

sweating reduces brain tissue volume equivalent to a year of aging. The wild part?

Your brain bounces back to normal size within minutes of rehydration, but chronic dehydration

might cause permanent cognitive decline. They used MRI scans on athletes before and after workouts,

revealing the brain physically contracts then re-expands like a sponge. This explains why

you feel foggy during hot days or intense exercise. The fix is simple: drink water before

you feel thirsty, because by then your brain has already started shrinking. Your cognitive performance