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.
making sure that you're ingesting enough fluids in particular water and salt, especially if you're using caffeine in order to increase your levels of alertness, regardless of where that caffeine source comes from coffee, tea, or otherwise, that can cause the excretion of sodium and can lead to a kind of shakiness, a lightheadedness and the feelings of hunger that may or may not be related to blood glucose.
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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.
as long as I'm hydrating enough and I'm getting enough salt, then I tend to feel fine with that much caffeine.
So one thing that works very well to maintain mood and alertness longer given a certain amount of caffeine intake and to avoid the jitteriness and what can sometimes feel like a crash or low blood sugar feeling or even blurry vision is to make sure that you consume at least an equal volume of water with your caffeine. And ideally, that water would contain maybe a small pinch of salt or some sort of electrolyte drink-- or powder, rather.