Plant-based diet, mental health interventions may help improve older adult sleep

However, they also found anxiety and depression to be potential mediators in the diet-sleep relationship, which may necessitate both dietary and mental health interventions to improve sleep quality in ageing populations. Sleep disorders continue to pose significant public health challenges worldwide, with rising rates of sleep disturbances such as insomnia affecting both individuals and healthcare systems. Research has highlighted a global surge in sleep problems, which impact mental health, cognitive function, and quality of life across various demographics. Among older adults, the situation is particularly concerning. They tend to be more susceptible than younger individuals to sleep disorders, as well as other health challenges, such as chronic illnesses and psychological issues. In fact, studies have confirmed that older adults are more prone to poor sleep health and often struggle to maintain consistent, restorative sleep due to various physical, environmental, and behavioural factors. Diet versus mental health concerns Diet has emerged as an influential, modifiable factor in promoting sleep health among older adults, with plant-based diets showing particular promise. Foods rich in nutrients like flavonoids, polyphenols, and other anti-inflammatory compounds, such as fruits and vegetables, are associated with improved sleep quality and a reduced risk of insomnia. Plant-based diets may also support cognitive function and cardiovascular health, and increase levels of tryptophan, a precursor to serotonin and melatonin (both critical in regulating sleep patterns). Consequently, a well-rounded plant-based diet could mitigate sleep disturbances among the elderly. However, mental health issues can be an exacerbating factor in poor sleep health. Depression and anxiety are particularly prevalent among older adults and closely linked to poor sleep quality. These conditions can disrupt sleep patterns, contributing to difficulties in falling or staying asleep, which, in turn, may compound these mental health challenges. The good news is that research points to an association between plant-based diets and improved mental health outcomes, with individuals who adhere to plant-based diets at a reduced risk of mood disorders. This correlation may be due to the anti-inflammatory and mood-regulating effects of plant-based nutrients, which help stabilize neurotransmitter activity. As such, a nutrient-rich plant-based diet could have a positive impact on both sleep quality and mental health. Expanding on mental health’s sleep and dietary impact However, though previous studies have linked plant-based diets to improved sleep, research examining mental health’s mediation of this relationship has been sparse. As such, researchers at Harbin Medical University sought to address this gap by exploring how anxiety and depression may affect the diet-sleep relationship in older adults, revealing potential pathways for targeted dietary and mental health interventions to improve this relationship. The study, drawing on data from the 2018 Chinese Longitudinal Healthy Longevity Survey (CLHLS), analysed the dietary habits and mental health of 6,853 older Chinese adults. It subsequently revealed that individuals following a healthy plant-based diet experienced better sleep quality and duration, but anxiety and depression were found to affect this relationship. The researchers reported that older adults who adhered more closely to a healthy plant-based diet (rich in fruits, vegetables, whole grains, and other nutrient-dense plant foods) were 20.9% more likely to report higher sleep quality and 24.1% more likely to get adequate sleep. In contrast, participants who followed a less balanced plant-based diet with high levels of processed plant foods had a reduced likelihood of good sleep quality and adequate sleep duration. These findings were consistent with those from previous research, which had linked plant-based diets to a lower risk of sleep disorders, reduced oxidative stress, and improved mental health, possibly due to their rich anti-inflammatory and antioxidant compounds. In the case of the current study, it went further than its predecessors by highlighting the specific role of mental health — particularly anxiety and depression — in mediating the diet-sleep connection. The researchers also suggested that dietary tryptophan — which is abundant in nutrient-rich plant foods — may boost serotonin and melatonin levels, improving both sleep and mood. Additionally, compounds like polyphenols and flavonoids in fruits and vegetables may reduce inflammation and oxidative stress, promoting healthier sleep patterns. Limitations and future indications The researchers that the study’s limitations included its cross-sectional design that prevented them from establishing causality, and reliance on self-reported sleep measures, which may not have fully captured sleep complexity. Nonetheless, the findings highlighted the potential benefits of healthy plant-based diets for sleep and mental health in aging populations. The researchers recommended that future studies incorporate additional sleep measures and consider the bi-directional relationship between sleep and mental health. They concluded: “Given the rapid ageing of the Chinese population, these findings can inform targeted preventive measures. Public policies could prioritize the psychological health as well as dietary habits of older adults to enhance their sleep health.” Source: Nutrients “The Relationship between Plant-Based Diet Indices and Sleep Health in Older Adults: The Mediating Role of Depressive Symptoms and Anxiety” https://doi.org/10.3390/nu16193386 Authors: Junping Liu, et al.

Plant-based diet, mental health interventions may help improve older adult sleep

There may be a positive correlation between nutrient-rich plant-based diets and improved sleep health among older adults, according to a study by researchers in China.

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