Dangerous Caffeine

Others worry  about me taking up tobacco or even crack cocaine and I worry about caffeine. Then Michael Pollan's The invisible addiction: is it time to give up caffeine? came to my attention.

I postponed it as long as I could, but finally the dark day arrived. According to the researchers I’d interviewed, the process of withdrawal had actually begun overnight, while I was sleeping, during the “trough” in the graph of caffeine’s diurnal effects. The day’s first cup of tea or coffee acquires most of its power – its joy! – not so much from its euphoric and stimulating properties than from the fact that it is suppressing the emerging symptoms of withdrawal. This is part of the insidiousness of caffeine. Its mode of action, or “pharmacodynamics”, mesh so perfectly with the rhythms of the human body that the morning cup of coffee arrives just in time to head off the looming mental distress set in motion by yesterday’s cup of coffee. Daily, caffeine proposes itself as the optimal solution to the problem caffeine creates.

While this describes some of my concerns since quitting my old 6 liters of Coca-Cola about my memory and thinking process and ability to cope with more than one idea at a time:

At some point I began to wonder if perhaps it was all in my head, this sense that I had lost a mental step since getting off coffee and tea. So I decided to look at the science, to learn what, if any, cognitive enhancement can actually be attributed to caffeine. I found numerous studies conducted over the years reporting that caffeine improves performance on a range of cognitive measures – of memory, focus, alertness, vigilance, attention and learning. An experiment done in the 1930s found that chess players on caffeine performed significantly better than players who abstained. In another study, caffeine users completed a variety of mental tasks more quickly, though they made more errors; as one paper put it in its title, people on caffeine are “faster, but not smarter”. In a 2014 experiment, subjects given caffeine immediately after learning new material remembered it better than subjects who received a placebo. Tests of psychomotor abilities also suggest that caffeine gives us an edge: in simulated driving exercises, caffeine improves performance, especially when the subject is tired. It also enhances physical performance on such metrics as time trials, muscle strength and endurance.

But comes back to here:

 Alas, there is no free lunch. It turns out that caffeine only appears to give us energy. Caffeine works by blocking the action of adenosine, a molecule that gradually accumulates in the brain over the course of the day, preparing the body to rest. Caffeine molecules interfere with this process, keeping adenosine from doing its job – and keeping us feeling alert. But adenosine levels continue to rise, so that when the caffeine is eventually metabolised, the adenosine floods the body’s receptors and tiredness returns. So the energy that caffeine gives us is borrowed, in effect, and eventually the debt must be paid back.