Association of Urinary Equol Concentration with Frailty in Community-Dwelling Older Adults: The Itabashi Longitudinal Study on Aging.

Equol producers had significantly lower odds of frailty or prefrailty compared to non-producers.

• Odds ratio for frailty or prefrailty among equol producers versus non-producers: OR=0.71 (95% CI, 0.51–0.97)
• Analysis used binomial logistic regression adjusting for age and sex
• 651 community-dwelling older adults aged 70–85 were included in the cross-sectional analysis
• Data were from the Itabashi Longitudinal Study on Aging, collected in February 2023

Equol production was significantly associated with lower odds of low physical activity as a frailty component.

• OR for low physical activity among equol producers: OR=0.60 (95% CI, 0.41–0.88)
• Low physical activity was the specific frailty component most strongly associated with equol production status
• Frailty was assessed based on the revised Japanese Cardiovascular Health Study criteria

The majority of participants were classified as equol producers, and more than half were frail or prefrail.

• 57.1% of participants were equol producers, defined as urinary equol concentration ≥1,000 nmol/L
• Non-producers were defined as urinary equol concentration <1,000 nmol/L
• 55.8% of participants were categorized as frail or prefrail
• Urinary equol concentration was measured using Enzyme-Linked Immunosorbent Assay (ELISA)

Equol is a metabolite of the soy isoflavone daidzein with potential health benefits relevant to aging.

• Equol has gained attention for its potential health benefits particularly in bone, muscle, and cardiovascular health
• Frailty is described as a common geriatric syndrome associated with adverse health outcomes
• The study design was cross-sectional, limiting causal inference, and the authors call for longitudinal studies to further explore the association