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When you’re exercising, it’s especial-
ly important to drink lots of water and
stay
hydrated
! Caffeine makes you
pee more, and this can mean your
cells have less of the water they need.
In 2000, an Astros pitcher was
hospitalized for
dehydration
after drinking several cans of
Red Bull.
Caffeine can make your
heartbeat irregular—and you
need your heart at peak
performance during exercise.