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Leg day feels impossible? Sniffing dark chocolate before your workout could help you do 18 extra reps without extra effort, study suggests
Leg day feels impossible? Sniffing dark chocolate before your workout could help you do 18 extra reps without extra effort, study suggests
By Trending Desk
, ET OnlineLast Updated: Jul 19, 2026, 01:26:00 PM IST
Synopsis
A new study suggests smelling dark chocolate boosts gym repetitions significantly. Participants completed more exercises without feeling increased exertion after sniffing the aroma. Dark chocolate’s scent also reduced hunger and increased feelings of fullness. Milk chocolate aroma made workouts feel more enjoyable for the participants. These findings highlight smell’s powerful influence on appetite and physical performance
Agencies
Do you also struggle with your leg day at your gym? What if you were told that improving your workout didn’t require a new supplement or pre-workout drink, but simply the smell of chocolate? Yes, you read that right. A new study has found that sniffing dark chocolate before and during strength training may help people perform more repetitions without feeling like they’re working any harder. Researchers also discovered that the aroma reduced hunger and increased feelings of fullness, while the scent of milk chocolate made workouts feel more enjoyable.ALSO READ: After selling his tech company for an eight-figure fortune, this Canadian entrepreneur spent $1.5 million building 99 tiny homes to help homeless people rebuild their lives
Chocolate smell may boost gym performance
Published in Frontiers in Physiology, the study explored whether the smell of chocolate could influence appetite, mood and exercise performance during strength training.ALSO READ: How Argentina won the 2022 FIFA World CupAccording to researchers, it was found that participants who smelled 90% dark chocolate completed significantly more repetitions during leg extension exercises compared to those exposed to water.Participants performed around 18 extra repetitions after sniffing dark chocolate, while those exposed to 60% milk chocolate completed about nine additional repetitions compared to the control group, the study showed.Interestingly, participants did not report feeling that the workout was any more difficult, despite performing more work.”Exposing moderately trained men to chocolate odors right before and between sets of resistance exercise significantly increased their overall training volume without increasing their perceived exertion,” said senior author Dr Mohamed Nashrudin bin Naharudin, assistant professor at the Faculty of Sports and Exercise Science at the University of Malaya.”Seeing a substantial increase in repetitions without the athletes feeling like they were exerting themselves any harder is a fascinating psychobiological outcome.”
How was the study conducted?
Researchers recruited 23 healthy, moderately trained men in their early to mid-20s. Participants were divided into three groups and exposed to one of the following scents:
- Liquified 90% dark chocolate
- Liquified 60% milk chocolate
- Water, which served as the control
Before taking part in the workout, participants had fasted for at least 10 hours.They then performed leg extension exercises, a common lower-body strength exercise carried out using a leg extension machine.Before and during the workout, researchers measured:
- Hunger
- Fullness
- Desire to eat
- Intention to eat
- Exercise performance
Between sets, participants smelled their assigned sample for 30 seconds before continuing.
Dark chocolate reduced hunger before exercise
One of the study’s biggest findings was that dark chocolate affected appetite even though participants never actually ate any chocolate.Compared to the milk chocolate and water groups, those exposed to 90% dark chocolate reported:Feeling less hungryReduced desire to eatLower intention to eatGreater feelings of fullnessResearchers believe the smell of dark chocolate may act as a psychological signal that tricks the brain into expecting a rich, satisfying meal.”We know olfaction is powerfully wired into the brain’s appetite and emotion networks, but surprisingly, no study has systematically looked at the three-way interaction between smell, appetite, and actual resistance exercise capacity,” said Nashrudin Naharudin.
Can simply smelling food affect your body?
According to the researchers, familiar food aromas may activate memories and expectations formed over many years.Without taking a single bite, the brain may begin preparing for food by triggering psychological and physiological responses normally associated with eating.This could explain why participants felt fuller despite remaining in a fasted state.Researchers say these findings highlight how powerful smell can be in influencing both appetite and physical performance.
The researchers say more studies are needed
Although the results are promising, the researchers caution that this was a small experimental study involving only 23 young men. They also noted several limitations.The study did not measure hormones or brain activity, meaning scientists cannot yet explain the exact biological mechanisms behind the results.In addition, participants may have recognised that water was odorless, making it easier to guess they were in the control group.Future studies involving women, older adults and larger groups of participants will be needed to confirm whether the findings apply more broadly.
Is chocolate the only smell that could work?
Probably not. Researchers believe chocolate may simply be one example of a familiar food aroma capable of influencing appetite and performance.”We don’t think chocolate is entirely unique, though it is a food cue with incredibly strong, universally recognized reward associations,” Nashrudin Naharudin concluded.Although more research is needed, scientists say other foods strongly associated with fullness could potentially produce similar effects.However, there’s one important condition.”A person likely needs to find the odor familiar and appealing – or at least not repulsive – to trigger the psychological shift in appetite that’s needed to see a performance boost.”
What the findings could mean
The study suggests that the smell of dark chocolate may become an unexpected tool for people who regularly perform strength training.While it’s far too early to recommend chocolate aromas as a workout strategy, the findings open the door to new ways of improving exercise performance without changing nutrition or training programmes.For now, researchers say the results are encouraging—but larger studies are needed before anyone starts treating the scent of chocolate as a gym essential.Add 
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