Jon Snow's wife recalls the broadcaster's early Alzheimer's warning signs and says he was 'written off' by people after his diagnosis

Early warning signs of Alzheimer’s disease may soon be detectable in one of the most personal spaces—your bathroom. Researchers at the University of Chicago have uncovered a promising new insight into the early detection of Alzheimer’s, suggesting that a diminished sense of smell could serve as a critical early indicator of the condition. This discovery marks a significant shift in how the disease is understood and potentially managed, offering hope for earlier intervention and improved patient outcomes.

The study, published in June 2026, focused on the connection between olfactory function and memory impairment. Scientists analyzed the sense of smell in 515 older adults, aiming to create standardized screening tools akin to those used for vision and hearing assessments. Their findings revealed that individuals experiencing a rapid decline in their ability to recognize familiar scents—such as those encountered during daily routines like showering—may be showing early signs of Alzheimer’s. This revelation adds a new dimension to the diagnostic process, emphasizing the importance of recognizing subtle changes in sensory perception alongside more commonly known symptoms like memory loss.

Professor Jayant M Pinto, a leading researcher in the field of olfactory and sinus diseases at the University of Chicago, emphasized the significance of these findings. He explained that a sudden reduction in the ability to detect smells correlates with structural changes in the brain, particularly in regions linked to memory and olfaction. His team observed that individuals with a pronounced decline in their sense of smell exhibited smaller volumes and altered shapes of grey matter in these crucial brain areas. These insights underscore the potential for using olfactory testing as a non-invasive method to screen for early-stage Alzheimer’s, thereby enabling timely medical attention.

The implications of this research extend beyond clinical settings. For individuals and families concerned about cognitive health, the identification of a loss of smell as a potential early warning signal offers a tangible step toward proactive health management. If someone notices a persistent inability to recognize familiar scents, especially during routine activities, it may be an indication that further evaluation is necessary. Encouragingly, early diagnosis can lead to interventions that may slow the progression of the disease and enhance the quality of life for those affected.

In parallel, the personal experience of Jon Snow, a well-known broadcaster, highlights the emotional and social challenges faced by those diagnosed with Alzheimer’s. His wife, Dr. Precious Lunga, a Zimbabwean epidemiologist and neuroscientist, shared how she recognized early signs of the condition in her husband after his retirement. She noted that his depression following the end of his career increased his vulnerability to dementia. Despite passing standard cognitive tests, Dr. Lunga’s detailed records of his behavioral changes led to a definitive diagnosis. Her account illustrates the complex journey of identifying and addressing early symptoms, often requiring persistence and a multidisciplinary approach involving both medical professionals and personal observation.

As the prevalence of dementia continues to grow, with over 944,000 people in the UK currently living with the condition, the need for innovative diagnostic methods becomes increasingly urgent. The integration of olfactory assessment into routine health screenings represents a valuable addition to existing diagnostic protocols. By focusing on early indicators such as a loss of smell, healthcare providers can offer more effective support and resources to patients and their caregivers, ultimately contributing to a more compassionate and informed response to Alzheimer’s disease.