This Link Between "Cinderella Sense" and Over 130 Disorders

A crucial human sense, often overlooked, may provide important clues about a wide range of medical conditions. While vision and hearing checks are routine in healthcare, assessment of the sense of smell is far less common. Yet, research shows that olfactory health is potentially connected to over 139 disorders, spanning conditions such as Alzheimer's, Parkinson's, and congestive heart failure, according to a review in Clinical Otolaryngology.

The COVID-19 pandemic has brought increased awareness to smell disorders, which include complete or partial loss of smell, or changes in how odors are perceived. Despite this, experts suggest that many cases remain undiagnosed. The review refers to the sense of smell as the Cinderella sense, highlighting how it has been historically undervalued compared to sight and hearing.

Olfactory dysfunction currently affects around 22% of the global population, with higher prevalence among men and adults over 60. While it often arises with aging, it can also result from upper respiratory infections like COVID-19, head injuries, chronic sinus inflammation, or as a side effect of certain medications, including some cholesterol-lowering drugs.

Early detection of smell disorders is critical because it can signal the onset of serious illnesses. For instance, loss of smell can appear more than four years before the motor symptoms of Parkinsons disease. This occurs because neurodegenerative changes may begin in brain regions associated with smell before affecting other bodily systems. Additionally, olfactory dysfunction in older adults has been linked to a higher 10-year risk of stroke and long-term risk of heart failure, even among individuals otherwise considered healthy.

Beyond disease detection, olfactory health is vital for nutrition and overall well-being. Impaired smell and taste often lead to diets high in calories, fats, and added sugars, contributing to nutritional deficiencies and obesity. Furthermore, those with smell disorders experience higher rates of depression, social isolation, and eating disorders, as scent plays a key role in food enjoyment, social interaction, and hazard detection, such as avoiding spoiled food or smoke.

The review emphasizes that the sense of smell should be recognized as an essential component of health. Recommendations include educating healthcare professionals worldwide, expanding research into treatment options, and increasing accessibility to smell testing. Ultimately, our noses may provide critical insights into our overall health.

Author's Commentary: Rethinking the Overlooked Sense of Smell

As the author reflecting on this emerging research, it is striking how much the sense of smell has been undervalued in routine healthcare. While vision and hearing screenings are standard, olfactory assessments remain rare, despite clear evidence linking smell disorders to over 139 medical conditions.

The COVID-19 pandemic has heightened awareness of smell loss, yet many cases still go undiagnosed. This “Cinderella sense” not only signals potential neurodegenerative diseases like Parkinson’s and Alzheimer’s years before other symptoms appear, but also correlates with cardiovascular risks and nutritional health in older adults.

From a practical standpoint, recognizing and testing olfactory function can provide early warning signs of serious illnesses. Healthcare systems should prioritize smell testing, educate professionals, and invest in research to better understand interventions. In doing so, we may unlock a simple yet powerful tool for preventive medicine and overall well-being.

Sources:

• This “Cinderella Sense” May Be Tied to More Than 130 Disorders