The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
And actually if you keep doing that for 25 or 30 breaths of inhale deep short exhale, you will start to secrete a lot of adrenaline. This hormone that comes from your kidneys and from your brainstem make you feel really alert. You will actually feel as if you've had a cup of espresso.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Probably safe to do 25 or 30 deep inhales and exhales. And you'll notice that by about breath 10, you'll start to feel tingly, and you'll probably feel a little bit more alert. And, again, if you have anxiety or panic attack tendencies, please don't do this. But you will feel an increase in so-called autonomic arousal, an increase in the activity of your overall sympathetic nervous system, which has nothing to do with sympathy, has everything to do with alertness. You'll actually deploy adrenaline from your adrenals.