How the Smell of Coffee Affects the Brain Before the First Sip
A new Japanese study reveals that smelling fresh coffee for five minutes improves mood and brain relaxation metrics without altering heart rate.
Many people know the feeling: waking up in the morning, brewing a cup of coffee, and before the beverage even touches the lips, the spreading aroma makes the morning feel more bearable and pleasant. But how does this happen if not a single drop of caffeine has entered the bloodstream yet?
A new study conducted at Showa Pharmaceutical University in Japan and published in the scientific journal Nutrients examined precisely this moment. Researchers sought to determine whether the smell of coffee affects mood and whether the brain and body react to it simultaneously.
The Experiment Setup and Brain Response
The experiment involved 20 young students. Researchers brewed fresh coffee, placed the pot about half a meter away from the participants, and asked them to sit quietly, breathe normally, and inhale the aroma for five minutes without drinking. Simultaneously, devices were attached to measure brain waves and heart rate, while questionnaires regarding mood were filled out before and after the experiment.
The results showed that within just five minutes, participants' moods improved: they reported less stress, anxiety, fatigue, confusion, and depression. Brain wave analysis identified an increase in metrics associated with relaxation and calm. However, physical metrics such as pulse and heart rate remained entirely unchanged.
"The scent of coffee does not provide an immediate burst of energy, but rather lowers the volume of negative sensations, triggering a relaxation response through memory and emotion-linked brain centers."
Limitations and Conclusions
Researchers note that these findings should be interpreted with caution. The experiment was conducted on a very small group and lacked a control group—such as individuals sitting in an odor-free room or exposed to a different scent. Consequently, the quiet sitting itself may have contributed to the relaxation.
Ultimately, there is no reason to forgo drinking coffee in favor of merely smelling it, but the next time the aroma of fresh coffee improves your mood before the very first sip, your brain has likely already taken a mini-break.
