A recent study by biologists at the University of Texas at El Paso has unveiled a surprising side effect of consuming coffee in the evening: it may not only keep you awake but also significantly increase impulsivity, particularly in women. These compelling findings, derived from a series of experiments on fruit flies, have been published in the prestigious journal iScience.
The research team meticulously investigated the impact of caffeine on the behavior of fruit flies, or Drosophila, taking into account both the time of day the caffeine was administered and the sex of the insects. The experimental design involved providing the flies with caffeine at various times, after which their ability to suppress impulsive reactions was rigorously tested. For instance, researchers observed how well the insects could halt their movement when subjected to a strong air current, a measure of their self-control.
The results were striking: nocturnal caffeine consumption notably diminished the fruit flies` self-control, leading to what the scientists termed “risky behavior.” Despite the unpleasant conditions, the caffeine-influenced flies continued to move actively. In stark contrast, caffeine administered during daylight hours did not produce this observed effect on their impulsivity.
Even more remarkably, female fruit flies demonstrated a heightened sensitivity to caffeine taken at night. This was observed despite their internal caffeine levels being comparable to those of their male counterparts. This particular finding suggests that an individual`s reaction to caffeine might be influenced more by intrinsic genetic or physiological characteristics rather than solely by hormonal balances.
The authors of the study emphasize that these insights could have significant implications for humans. This is especially true for individuals who regularly work night shifts, such as healthcare professionals, military personnel, or machine operators, as well as anyone who consumes coffee before bedtime. Women, in particular, may face an elevated risk, given that their physiological response to caffeine during nighttime hours appears to be more pronounced.
Separately, earlier scientific investigations have also highlighted potential dangers associated with instant coffee concerning eye health.
