Longitudinal association between oral function and underweight onset among community-dwelling older adults: Role of regular self-weighing.

Abstract

Regular self-weighing is effective in weight management and may help to mitigate the risk of underweight among older adults. We examined which factors of oral function are associated with a risk for underweight among community-dwelling older adults and whether regular self-weighing can mitigate that risk. This was a cohort study. Self-administered questionnaires were mailed to 7665 older adults in March 2019 (response rate 74.3%) and 7591 in March 2020 (response rate 74.7%). Among those who responded to both surveys, 3594 older adults who were not underweight in March 2019 were included (follow-up rate: 59.2%). We examined the association between dysphagia, poor masticatory function, and dry mouth and the development of underweight, and whether regular self-weighing reduced the risk for underweight. The average age±standard deviation of participants was 71.1±3.4 years. There was a significant association between swallowing difficulty and the occurrence of underweight (odds ratio=1.65, p=.012). However, this relationship did not differ significantly with regular self-weighing (p=.477). These study findings suggest that to prevent underweight among community-dwelling older adults, it is important to focus on those with poor swallowing function.