A study of 20 young adults found that five minutes of exposure to freshly brewed coffee aroma was associated with lower reported tension, fatigue, confusion and depressed mood, though researchers cautioned that the small study lacked a control group.
By yourNEWS Media Newsroom
The smell of freshly brewed coffee may influence mood before caffeine ever reaches the body, according to a small study that found measurable reductions in several negative mood measures after participants spent five minutes exposed to coffee aroma.
The research, published Sept. 9 in Nutrients, involved 20 healthy adults between ages 20 and 29. Participants were placed near freshly brewed coffee positioned about 20 inches away and allowed to breathe normally while researchers measured mood, brain activity and cardiovascular responses.
After five minutes, participants reported lower levels of tension-anxiety, fatigue, confusion and depression-dejection. Overall mood disturbance declined by an average of 20.5 points.
Researchers also recorded changes in electrical brain activity. An electroencephalogram-based relaxation index increased from approximately 0.74 before exposure to 0.78 afterward, providing a measurable neurological change that corresponded with participants’ reported mood improvements.
“The smell caused the students’ moods to settle, not perk up,” said Rod Mitchell, a registered psychologist with Emotions Therapy Calgary who was not involved in the research.
Brain Response May Reflect Learned Associations
Researchers and outside experts said the findings may have more to do with the psychological meaning people attach to coffee than with a direct drug-like effect from its aroma.
Smell has close connections with brain systems involved in emotion and memory, allowing odors to trigger reactions associated with previous experiences.
For people who regularly drink coffee, its scent may have become linked over time with familiar experiences such as taking a break, starting the morning, feeling warmth or pausing during a stressful day.
“A regular coffee drinker has paired the coffee aroma with a break, warmth and relief thousands of times, so the smell alone starts the settling the body has been trained to expect,” Mitchell said.
That process, sometimes described as conditioning, could allow the aroma itself to prompt an emotional response before a person drinks the coffee.
Coffee also contains numerous aromatic compounds, including pyrazines, some of which have antioxidant properties. The study, however, did not establish that those compounds were responsible for the observed changes in mood.
Heart Measurements Remained Largely Unchanged
Researchers did not find significant changes in heart rate or heart rate variability following exposure to the coffee aroma.
That distinction suggests the observed effects were more apparent in participants’ reported psychological state and brain activity than in their cardiovascular measurements.
The results therefore do not show that smelling coffee produces a broad physiological relaxation response throughout the body.
Instead, the study raises the possibility that expectations, memories and learned associations surrounding coffee may contribute substantially to the effect.
Study Has Important Limitations
The findings come with significant limitations.
Only 20 people participated, and all were young adults between ages 20 and 29, meaning the results cannot automatically be applied to older adults or the broader population.
The research also did not include a control group exposed to no scent or to a different aroma.
Without that comparison, researchers cannot determine whether the improvement resulted specifically from coffee aroma. Participants may have felt better because they spent several quiet minutes resting, because they expected coffee to improve their mood or because of other features of the study environment.
Additional research using larger and more diverse groups, control conditions and different aromas would be needed to determine how much of the effect can be attributed directly to the smell of coffee.
Coffee Ritual May Matter Alongside Caffeine
Coffee has long been studied primarily for the effects that occur after it is consumed, particularly those associated with caffeine.
Caffeine can increase alertness and temporarily reduce feelings of tiredness, although excessive intake can contribute to nervousness, sleep problems and other unwanted effects.
The newer research examines a different component of the experience: the sensory ritual that takes place before drinking.
Roasting and brewing coffee release a complex mixture of aromatic compounds that produce its familiar smell. For habitual coffee drinkers, that aroma can become strongly associated with particular times, places and routines.
The study suggests those associations themselves may have measurable effects on mood.
Researchers See Potential Role as a Brief Sensory Pause
The findings do not support using coffee aroma as a treatment for anxiety, depression or other mental health conditions.
Other scents, including lavender and orange essential oils, have been examined more extensively for possible anxiety-reducing effects.
Coffee, however, has the advantage of already being part of the daily routine for many people, potentially making its aroma an easily accessible sensory cue for taking a brief break.
“Let your coffee breaks be actual breaks. The smell already signals a pause, so let it be one. Before the first sip, give the cup a full minute, phone face down,” Mitchell said.
That approach treats the aroma less as a therapy and more as an opportunity for a short period of deliberate rest.
The study ultimately found that five minutes of smelling brewed coffee coincided with improved mood scores and a modest increase in an EEG-derived relaxation measurement, without significant changes in heart rate.
While the evidence remains preliminary, the findings suggest that part of coffee’s appeal may begin before the first sip, through the interaction of scent, memory, expectation and the familiar ritual surrounding the drink.
Source: Natural News
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