A whiff of dark chocolate before hitting the weights could significantly enhance exercise performance, according to new research from Malaysian scientists.
The small-scale investigation, conducted at the University of Malaya and published in Frontiers in Physiology, discovered men who inhaled the aroma of high-cocoa chocolate managed substantially more repetitions during resistance training.
Remarkably, participants also experienced diminished appetite sensations without perceiving any increase in physical effort.
The findings suggest familiar, appealing food aromas may trigger psychological changes that benefit athletic output, offering gym-goers a rather unconventional tool for improving their workout results.
The scent of chocolate appears to diminish appetite sensations without perceiving an increase in physical effort
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The study recruited 23 healthy male volunteers, all aged in their early to mid-twenties, who were split into three separate groups.
Each cohort was exposed to a different odour sample: liquefied dark chocolate with 90 per cent cocoa content, liquefied milk chocolate containing 60 per cent cocoa, or plain water serving as the control.
Crucially, none of the participants had consumed any food for ten hours prior to the experiment.
The men then undertook leg extension exercises, a movement requiring them to sit and raise weights by straightening their lower limbs.
Researchers measured both physical performance and subjective hunger levels throughout the training sessions. The results proved striking, with dark chocolate delivering the most pronounced benefits.
Dr Mohamed Nashrudin bin Naharudin, the study’s senior author, stated: “Sniffing a 90 per cent dark chocolate odour added about 18 more repetitions to participants’ leg extensions while a 60 per cent milk chocolate odour added about nine repetitions compared to the water control.”
He added: “Exposing moderately trained men to chocolate odours right before and between sets of resistance exercise significantly increased their overall training volume without increasing their perceived exertion.”
Dr Nashrudin bin Naharudin described the outcome as “a fascinating psychobiological outcome”, noting athletes completed considerably more work without feeling additional strain.
The researchers proposed these effects stem from associations people develop with certain scents during childhood.
Dr Nashrudin bin Naharudin explained: “The dark chocolate scent serves as a learned cue for a rich, bitter and highly satiating food, which essentially tricks the system into an anticipatory state of fullness.”
Milk chocolate, by contrast, appears to function differently, creating a pleasurable sensory atmosphere rather than altering fundamental hunger signals.
Other appetising food aromas might produce comparable results to chocolate
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The team believes other appetising food aromas might produce comparable results, although this remains untested.
They acknowledged further investigation involving larger participant groups is necessary before drawing definitive conclusions.