The association of gustatory dysfunction, olfactory dysfunction, and cognition in older adults

The association of gustatory dysfunction (GD) with quality of life (QOL) and cognition in older adults is understudied. Our objective was to study the prevalence of GD in the community and explore impacts and associated factors.A prospective, multi-institutional, pre-COVID cohort of adults aged 50 and older had smell and taste testing using "Sniffin' Sticks" (TDI) and "Taste Strips". The impact of GD on mood, QOL, and social interaction was assessed through visual analog scales. Subjects completed the Questionnaire of Olfactory Disorders, Patient Health Questionnaire 9, Mini-Mental State Examination (MMSE), Montreal Cognitive Assessment, and the DeJong scale of loneliness.48 patients, average age of 54.7 years, were enrolled. 32% experienced GD on taste strips, and 62% experienced olfactory dysfunction (OD) on TDI. 29.5% had both GD and OD. GD and OD correlated with worsened cognitive function on MMSE (r = 0.392; 0.05, p = 0.018; 0.003). Subjects with both GD and OD had worse MMSE than either alone (p = 0.003). Dry mouth and difficult chewing correlated with GD (r = -0.37 and -0.31, p = 0.10 and 0.37). Self-reported GD and OD were correlated (r = 0.46, p = 0.001), as were psychophysical GD and OD (r = 0.394, p = 0.008). GD did not correlate with other metrics.32% of subjects experienced GD on psychophysical testing, yet most are unaware without impacts on daily life. However, GD correlates with worsened cognitive function. Taste testing may play a role in screening of neurocognitive decline, and multi-sensory dysfunction may indicate of worsened cognitive states. This article is protected by copyright. All rights reserved.