Caffeine and energy: how coffee affects focus

☕️ caffeine and energy: how coffee affects focus

there’s a lot of debate and opinion around coffee. some people can’t start work or the day without it. some run their whole life purely on coffee and willpower. and others, on the contrary, think coffee is evil and brings nothing but anxiety and aggression.

so how is it really?

let’s go in order. first: yes, coffee doesn’t create energy — it only temporarily blocks the feeling of fatigue.

while we’re awake, adenosine accumulates in the brain — a substance that signals it’s time to rest. caffeine is structurally similar to adenosine and occupies its receptors, keeping the brain from realizing it’s tired. as a result we feel alert, clear, focused. but in fact the fatigue is just postponed. when the caffeine wears off, all the accumulated adenosine comes back at once.

but that doesn’t mean coffee is bad.

caffeine triggers a release of dopamine and noradrenaline and stimulates the cerebral cortex. as a result, after a cup of coffee or tea, concentration, short-term memory, decision speed and mood improve. so having coffee before starting an important task can be an excellent decision.

a stress response, however, is activated when you exceed the daily caffeine dose: cortisol rises, hands shake, attention jumps. according to research from the Harvard School of Public Health, the optimal dose is up to 400 mg of caffeine per day (roughly 3–4 espressos or 2 mugs of filter coffee).

and beyond the amount of caffeine, the time when we drink it also matters.

what Huberman says about this: 🔘 it’s worth waiting 90–120 minutes after waking before the first cup of coffee. that way we don’t interfere with the natural cortisol peak and avoid the midday energy slump 🔘 cut caffeine 8–10 hours before sleep, especially if your sleep-wake cycle isn’t stable

and to use coffee as a focus tool: 🔘 it makes sense to drink it 30 minutes before diving into a task — that’s how long caffeine needs to take effect 🔘 a coffee nap instead of a power nap: drink coffee and lie down right away for 20–30 minutes. the caffeine kicks in just in time, and after waking you can feel a double boost of alertness 🔘 take an L-theanine tablet with your coffee — or swap coffee for green tea or matcha, which contain L-theanine. this amino acid reduces excess arousal and anxiety, making the caffeine boost calmer and more even

— bottom line: you don’t have to give up coffee at all, coffee is a friend) you just need to know how to use that friendship for the good of yourself and your tasks