Loss of Smell: Could It Signal a Higher Five-Year Mortality Risk?

Health
By Newsroom,  published 8 September 2025 at 22h12, updated on 8 September 2025 at 22h12.
Health

Recent research suggests that losing one’s sense of smell may be linked to a higher risk of death within five years, raising concerns among health experts about the importance of monitoring olfactory function as a potential early warning sign.

TL;DR

  • Loss of smell linked to higher mortality risk.
  • Olfactory test may predict hidden health issues.
  • Sense of smell vital for nutrition and safety.

A Silent Messenger: What Our Sense of Smell Reveals

When it comes to subtle indicators of our well-being, few would immediately think of the nose. Yet emerging research suggests that our sense of smell is far more than a simple pleasure or a culinary enhancer; it could be an early warning system for significant health challenges. Recent findings published in the journal PLOS One have thrust the sense of smell into the spotlight, suggesting that a decreased ability to recognize everyday odors might serve as an unexpected harbinger of increased mortality risk.

The Study: Simple Test, Profound Implications

Scientists observed over 3,000 adults between ages 57 and 85, asking participants to identify five familiar scents—rose, peppermint, leather, orange, and fish. The results are sobering: within five years, nearly 39% of those who entirely failed the initial test had died. For individuals with only moderate olfactory loss, this figure dropped to 19%, and plummeted further to just 10% among those whose sense of smell remained intact. In essence, severe olfactory decline almost quadrupled the risk of death during the study period—a relationship that researchers did not consider coincidental.

Why Smell Matters: More Than Scent and Flavor

The critical role played by our sense of smell reaches back through human history. It helped our ancestors avoid spoiled food or fire hazards and even guided mate selection via pheromones. Today, its importance persists: people who lose their sense of smell often experience reduced appetite, putting them at risk for malnutrition and frailty.

In fact, experts associate marked olfactory decline with several concerning symptoms:

  • Increased vulnerability to neurodegenerative diseases like Alzheimer’s or Parkinson’s
  • Weakened immune defenses leading to greater infection risk
  • Poor dietary habits stemming from loss of interest in food

    • The Future: Smell as a Diagnostic Tool?

    Given these revelations, some in the medical community are contemplating routine olfactory testing for older adults. Such tests are non-invasive and affordable—qualities that could make them valuable additions to geriatric care. While loss of smell isn’t a sentence on its own, experts emphasize that it may point to underlying problems deserving attention before more overt symptoms emerge.

    Ultimately, our noses may be whispering vital truths about our overall vitality—truths worth listening to long before illness becomes visible elsewhere.