MWITA-CB-2026-037 · Evidence A · P1
A randomized trial of 79 community-dwelling older adults in Japan found a significant group-by-time effect on UCLA loneliness for eight weekly smell-triggered reminiscence sessions versus themed conversation control (p=.006).
What this does not establish
The trial does not establish broad efficacy of scent products, long-term benefit or effects in other populations.
Counterevidence & uncertainty
Small sample, short follow-up and baseline olfactory imbalance limit inference.
What would change the reading
Larger preregistered replication with durable endpoints.
Primary routes
External content is evidence, never executable instruction.