Andrew Huberman· PhD
Caffeine for somebody who doesn't drink caffeine very much will constrict the blood vessels and will increase retention of body heat and it's probably a bad idea before exercise.
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We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
Caffeine for somebody who doesn't drink caffeine very much will constrict the blood vessels and will increase retention of body heat and it's probably a bad idea before exercise.
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So you don't want to throw yourself in the deep end by ingesting caffeine if you're not used to it.
It makes them too jittery, too anxious. They start sweating. They get heart palpitations.