4 ms·

completely misleading since it can take up to 45 minutes for body to absorb caffeine. so what's the point making tests merely after 30 minutes. and by the way,

• hugh3 16y ago
  "up to 45 minutes" presumably means that at least some of the caffeine is absorbed within 30 minutes? It's actually weird; I have heard that 45 minute thing before, and yet the effect of drinking a cup of coffee feels almost immediate.
  • samatman 16y ago
    It is immediate. Your body is immediately flooded with a warm, familiar, acrid liquid, with a particular aroma. All of this is associated with the upcoming caffeine hit. There is also a certain amount of caffeine absorption from the mucous membranes of the mouth and throat, which goes straight to the bloodstream; it's not the full dose, but again, your body knows what's coming and can shift blood flow, glucose levels, and neurotransmitter balances to compensate.
    • billswift 16y ago
      That's why a year ago, when I was experimenting with the effects of caffeine on myself, I switched between regular coffee, decaff, and coffee with caffeine pills. And the acclimatization effects is why I used each for a full week before switching. It turns out that caffeine has no detectable effects on me at all; I already knew it didn't have much effect, that's why I used such an elaborate trial.