Freshly brewed coffee may do more than signal the start of a busy day. Its aroma alone could help ease tension, reduce fatigue and improve mood, according to a small study published in Nutrients.
The findings add to growing interest in how familiar smells affect emotion, attention and stress. Coffee is already among the world’s most widely consumed drinks. Its scent is often tied to routines involving warmth, rest, social connection and mental preparation. Researchers say that association may be important.
“If a person repeatedly experiences a coffee break as a short period of relief, the smell may eventually become a cue for relaxation”
In the study, scientists examined whether brief exposure to coffee aroma changed mood, heart rate and brain activity in healthy young adults. The results suggested a modest calming effect after five minutes of smelling freshly brewed coffee.
Participants reported lower overall mood disturbance, less tension and fatigue, and reduced feelings of confusion. Some measures of brain activity also shifted in a direction interpreted as greater relaxation.
The research does not show that coffee aroma is a treatment for stress or anxiety. It does, however, offer a useful reminder that simple sensory experiences can influence how people feel, particularly when they are linked to familiar and comforting routines.
The study involved 20 healthy adults aged 20 to 29. Each participant attended a controlled session in which freshly brewed coffee was placed roughly 50 centimetres away. The room was ventilated beforehand, with no other scent deliberately introduced. Participants sat quietly and breathed normally for five minutes while exposed to the aroma.
Researchers assessed psychological and physiological measures before and after the session. Mood was measured using the Profile of Mood States, known as POMS. This established questionnaire includes 65 items and evaluates six areas: tension-anxiety, depression-dejection, anger-hostility, fatigue-inertia, confusion-bewilderment and vigour-activity.
The team also monitored heart rate and used electroencephalography, or EEG, to record patterns of electrical brain activity. EEG cannot directly measure emotion, yet certain combinations of brainwave activity are commonly used as indirect markers of relaxation or arousal.
After exposure to coffee aroma, participants’ total mood disturbance scores fell. Reported tension-anxiety, fatigue-inertia, confusion-bewilderment and depression-dejection also decreased. Anger-hostility scores declined before statistical adjustment, although that finding was no longer considered statistically significant once the researchers accounted for multiple comparisons.
The pattern matters. The scent appeared to be associated more with settling and soothing than with a burst of energy. Participants did not report a significant increase in vigour-activity, despite coffee’s strong cultural link with wakefulness and productivity.
That distinction is important because the study focused only on aroma. Nobody drank coffee. No caffeine entered the bloodstream. The results therefore cannot be attributed to caffeine’s known stimulant effects on the central nervous system.
The EEG findings broadly reflected the mood results. The researchers reported that an EEG-derived relaxation index rose from approximately 0.74 before exposure to around 0.78 afterwards. This was a small change. Still, it occurred consistently across the group. Heart rate, by contrast, did not change significantly.
A stable heart rate alongside improved mood may suggest that the effect was psychological rather than a strong bodily response. It could reflect a moment of calm, anticipation or positive memory rather than an immediate cardiovascular shift. Researchers remain cautious about drawing firm conclusions from such a small experiment.
One major limitation is the absence of a control group. Participants did not complete a comparable session beside hot water, a neutral smell, an unpleasant smell or no scent at all. Without that comparison, it is impossible to isolate coffee aroma as the cause of the changes.
Five quiet minutes in a ventilated laboratory could improve mood for several reasons. Participants may simply have benefited from pausing. They may have become more comfortable during a second questionnaire. They may have expected coffee to feel pleasant or energising. The act of taking part in a study can itself alter responses, particularly when participants are aware of the stimulus being tested.
These possibilities do not invalidate the findings. They place them in context. The study provides an early signal rather than definitive evidence.
Experts in psychology and sensory science have long noted that smell has an unusually close relationship with emotion and memory. Odours are processed through neural pathways connected with regions involved in emotional learning and memory. A scent can rapidly evoke a person, place, season or routine. The response may be vivid and largely automatic.
For regular coffee drinkers, the smell of brewing coffee may be especially meaningful. It can become connected over years with waking up, taking a break, speaking with colleagues, sitting in a café or beginning a familiar task. That learned association may help explain why the aroma produces a sense of comfort or readiness, even when no coffee is consumed.
Conditioning may be a key part of the effect. If a person repeatedly experiences a coffee break as a short period of relief, the smell may eventually become a cue for relaxation. The body and mind may begin to anticipate the pause. This does not mean the experience is imaginary. Learned responses can have genuine effects on mood and behaviour.
It also means that coffee aroma may not affect everyone in the same way.
A person who associates coffee with rushed commutes, deadlines or insomnia could experience the scent differently. Someone who dislikes coffee may find it neutral or unpleasant. Cultural background, daily habits, caffeine use and previous experiences are all likely to influence the response.
The study’s participants were healthy adults in a narrow age range. The research cannot establish whether the same results would occur in older people, adolescents, people with anxiety disorders, individuals with sleep difficulties or those who rarely drink coffee. It also cannot show whether any benefit would persist beyond a few minutes.
More robust research is needed. Future studies could compare coffee aroma with neutral odours, other familiar scents and non-scented rest periods. Larger groups would improve confidence in the results. Researchers could also examine whether expectations matter by testing people who are told different things about the aroma, or by comparing regular coffee drinkers with non-drinkers.
It would also be useful to distinguish the effects of coffee itself from the wider ritual surrounding it. Freshly brewed coffee involves more than scent. There is heat, sound, visual anticipation, taste, social context and the deliberate act of stopping what one is doing. Those elements may work together.
A scented candle or room diffuser might reproduce part of the experience, yet it may not have the same effect as brewing coffee and stepping away from work. The ritual may carry much of the value. A brief pause with a warm cup, without a phone or computer competing for attention, creates a small pocket of recovery during the day.
For people wishing to use coffee aroma as part of a wellbeing routine, the practical approach is simple. Take a moment before the first sip. Notice the smell. Breathe slowly. Put distractions aside. Treat the coffee break as a genuine break rather than something consumed while scrolling through messages or answering emails.
Fresh beans in a shared workspace may also provide a pleasant sensory cue, although workplaces should be mindful of colleagues who are sensitive to smells. Brewing coffee during an intensive study session could become a deliberate marker that it is time to focus. At stressful moments, the aroma might offer a brief grounding exercise: notice the scent, take several unhurried breaths, then return to the task at hand.
Such practices should be viewed as supportive habits, not medical interventions.
Coffee aroma cannot replace evidence-based care for anxiety, depression or chronic stress. Anyone experiencing persistent worry, low mood, panic symptoms, sleep disruption or difficulty managing everyday life should speak with a qualified health professional. Psychological therapies, lifestyle support and, where appropriate, medical treatment have a much stronger evidence base than a five-minute scent exposure.
The study is nevertheless an intriguing piece of research because it shifts attention away from caffeine. Coffee’s appeal may not lie solely in its chemistry. Part of its power may be sensory, emotional and deeply learned.
For millions of people, brewing coffee is already a familiar daily ritual. This small study suggests that its aroma may contribute to the sense of comfort many people recognise. The evidence remains preliminary. The effect was modest. The mechanism is uncertain. Still, the research offers a relatable possibility, sometimes the first benefit of coffee may arrive before the first sip.
The post Can Just Smelling Coffee, Even Without Drinking, Improve Your Mood? first appeared on PP Health Malaysia (PPHM) | 10POINTS Evidence-Based Health News.
