How Sensory Loss Relates to Alzheimer’s Disease—and the Role of Mindfulness in Boosting Our Senses
Growing evidence highlights a strong link between sensory loss and neurodegenerative conditions like Alzheimer’s disease, Parkinson’s disease, and Dementia with Lewy Bodies. Research has found that sensory impairments—especially loss of smell and hearing—are early indicators of cognitive decline, often appearing years before memory loss or other hallmark symptoms.
The Link Between Sensory Loss and Alzheimer’s Disease
A scientific review published in 2022 revealed that 90% of Parkinson’s patients experience a loss of smell, which can precede diagnosis up to 10 years. Similarly, studies in Japan suggest that olfactory impairment is one of the earliest symptoms of Alzheimer’s disease, caused by amyloid-β protein accumulating in the olfactory nerve. This damage can spread to the hippocampus, disrupting memory and accelerating cognitive decline.
Aromatherapy and Sensory Stimulation: Promising Therapeutic Avenues
Research has uncovered that aromatherapy can support cognitive health, particularly in early stages of cognitive impairment. Studies show that inhaling certain essential oils, such as rosemary and lemon during the day or lavender and orange at night, can improve cognitive function. A recent study also found that menthol inhalation in mice with Alzheimer’s disease pathology reduced levels of inflammation-related cytokines and slowed cognitive decline.
Mindfulness and Sensory Health
Mindfulness practices like mindful walking offer another way to enhance sensory inputs and promote brain health. By fully engaging our senses—listening to distinct sounds, observing colours and textures, and noticing the tactile sensations of wind or warmth—we can strengthen the neural pathways tied to sensory processing. Regular sensory exercises may also reduce the risk of sensory loss, which is increasingly recognised as a trigger for cognitive decline.
Why Do Our Senses Decline First?
The question of why sensory loss often precedes memory impairment remains under investigation. Some researchers suggest that the brain’s sensory pathways may be more vulnerable to early damage from protein accumulation or inflammation. Others propose a “chicken-and-egg” relationship, where reduced sensory input accelerates brain decline, further impairing the senses.
Engage Your Senses
When the timeless presence experienced through the practice of mindfulness is extended out into the world of daily activity you will begin to find your senses awakened to the sights, sounds and smells that surround you, instead of the usual whirlpool of half-thoughts, plans, ideas, memories and wishes that flood our mind pulling us in all directions at the same time.
Preventing Alzheimer’s disease involves addressing risk factors early, and sensory health plays a crucial role. Simple actions like aromatherapy, engaging in mindful practices, and undergoing regular sensory screenings can help maintain brain health and quality of life as we age.