A study published in Frontiers in Physiology on September 15, 2026, suggests that the smell of chocolate can help men perform more leg extension repetitions without feeling more tired. The study involved 23 healthy, moderately trained men in their early to mid-20s. They were exposed to either the scent of dark chocolate (which contains 90% cocoa), milk chocolate (60% cocoa), or water as a control. They were then tested on their ability to perform leg extensions, an exercise where a person sits and straightens their lower legs against resistance to lift a weight. Participants who inhaled the scent of dark chocolate completed approximately 18 more repetitions than those in the water control group. Those exposed to milk chocolate completed about nine more repetitions. Interestingly, these improvements occurred without a noticeable increase in how hard the participants felt they were working. The study also found that dark chocolate was linked to lower hunger and a greater sense of fullness before the exercise, while milk chocolate was seen as more pleasant but had little effect on appetite. Researchers, including Dr. Mohamed Nashrudin bin Naharudin from the University of Malaya, suggested that familiar food aromas might influence both appetite and motivation. They proposed that the scent of dark chocolate could act as a learned cue, signaling to the brain that a rich, bitter, and filling food is coming. This might trick the body into feeling full, even before eating. In contrast, the sweeter scent of milk chocolate may improve training by creating a more enjoyable environment, without directly affecting hunger signals. The study’s authors caution that the biological explanation for these effects is still speculative. They did not measure blood hormones or brain activity, which are important for understanding how the body responds. Other limitations include the possibility that the intensity of the chocolate aromas varied, and that participants might have guessed which group they were in. The study also involved only a small number of healthy, young men, which limits the generalizability of the findings. The research highlights the idea that simply anticipating food might trigger responses similar to those caused by eating. This was observed while participants were fasting, suggesting that food aromas could prepare the digestive system or cause psychological and physical changes as the body expects a meal. However, it remains unclear whether chocolate is uniquely effective or if other familiar and appealing food smells could have similar effects. The researchers suggest that the key may be finding an odor that is both familiar and appealing to the individual, to achieve a performance boost.