Higher dietary phytochemical index associated with better sleep quality in adults with type 2 diabetes

This cross-sectional study examined 675 adults with type 2 diabetes (aged 35–75 years) to assess associations between dietary phytochemical index (DPI) and sleep parameters, inflammation, and oxidative stress markers. Participants in the highest DPI quartile (Q4) had longer sleep duration (422.69 ± 20.01 minutes) compared to lower quartiles (367.47 ± 43.36 minutes), with a statistically significant difference (p < 0.05). Higher DPI was also associated with better sleep quality and lower systemic inflammation, though specific effect sizes for these outcomes were not reported.

Safety and tolerability data were not reported in this observational study. The primary limitation is the cross-sectional design, which prevents determination of causality or directionality in the observed associations. The authors explicitly note that prospective randomized controlled trials are required to confirm these associations and establish causality.

For clinical practice, these findings suggest a potential role for phytochemical-rich diets in supporting sleep quality and metabolic health among adults with type 2 diabetes. However, clinicians should interpret these results cautiously as associations only, not evidence of therapeutic benefit. The study provides preliminary data that could inform future interventional research on dietary approaches for sleep and inflammation management in this population.