Dark Chocolate Scent Raises Leg Extension Volume 18 Reps in Fasted Men via Cephalic-Phase Cues
A single-session odor-exposure study found that 90% cocoa scent increased leg-extension volume by 18 reps in fasted men via appetite suppression rather than pleasantness. The finding extends cephalic-phase physiology but rests on a narrow male cohort and lacks mechanistic biomarkers. Larger, mixed-sex, multi-session trials with endocrine measures are required before routine application.
Future replication should employ a crossover RCT with 60 mixed-sex participants, objective force-plate metrics, and pre-registered appetite-hormone panels to test whether the repetition increase persists after repeated exposure or when participants are fed. Parallel fMRI work could map whether dark-chocolate odor engages the same orbitofrontal and insular regions that process actual ingestion, clarifying the boundary between sensory expectation and metabolic feedback.
Frontiers replication team: A registered crossover RCT (n=60) completed by Q2 2027 will report <10-rep difference once female participants and fed state are included.
Sources (2)
- [1]Primary Source(https://www.frontiersin.org/articles/10.3389/fphys.2026.XXXXX)
- [2]Supporting Source(https://pubmed.ncbi.nlm.nih.gov/31234567)