Emerging research suggests that our sense of smell might serve as an early indicator of declining health and even impending death.
A study conducted by the University of Chicago found that older adults with a diminished sense of smell were significantly more likely to die within five years compared to those with normal olfactory function. Specifically, 39% of participants who failed a smell test died within five years, compared to 19% with moderate smell loss and 10% with a healthy sense of smell.
Further research from Johns Hopkins Medicine supports these findings, indicating that loss of smell is associated with increased frailty in older adults. This suggests that olfactory decline could be a measurable biomarker and potential risk factor for unhealthy aging.
Additionally, studies have shown that the body releases specific compounds during the dying process, notably putrescine—a byproduct of tissue decomposition. While humans may not consciously recognize this scent, even subconscious exposure to putrescine can trigger heightened alertness and defensive behaviors.
These findings highlight the importance of the olfactory system not only in detecting environmental cues but also as a potential indicator of internal health status. Regular screening for smell loss in older adults could serve as a valuable tool in assessing the risk of frailty and mortality.
As our understanding of the connection between smell and health deepens, it underscores the need for further research into how olfactory function can inform medical assessments and interventions.