Overview
- A peer‑reviewed exploratory trial published Thursday, July 9, 2026, found that brief inhalation of a 90% dark chocolate scent before and between leg‑extension sets increased repetitions by about 18 versus an odorless water control.
- A 60% milk chocolate scent produced a smaller benefit of roughly nine extra repetitions and was rated as more pleasant but did not suppress hunger the way dark chocolate did.
- Researchers tested 23 healthy, resistance‑trained men in their early to mid‑20s after at least a 10‑hour fast, using repeated leg extensions and repeated 30‑second odor exposures to measure performance and self‑reported appetite.
- The authors propose a learned anticipatory (cephalic) olfactory effect—a smell‑triggered shift toward fullness—as a possible mechanism, but they measured no hormones or neural markers to confirm it.
- Experts and the paper itself highlight key limits: a small, homogeneous sample, a possibly unblinded odorless control, no biomarker data, and testing only one exercise and one fasting state, so wider, mechanistic replication is needed before practical recommendations.