A secondary analysis of the DASH4D randomized clinical trial, published in Diabetes Care, examined whether a diabetes-adapted version of the Dietary Approaches to Stop Hypertension (DASH) diet could improve markers of blood glucose control. The controlled feeding study included 101 adults with type 2 diabetes, with a mean age of 67 years. Participants followed the DASH4D diet and a comparison diet representative of a typical American diet, with each diet tested under higher- and lower-sodium conditions for 5 weeks. Compared with the comparison diet, DASH4D significantly reduced fructosamine by 5.6 μmol/L and fasting glucose by 4.5 mg/dL, indicating improvements in both short-term glycemic exposure and fasting glucose levels.

The diet was also associated with a modest but statistically significant reduction in HbA1c of 0.09 percentage points compared with the comparison diet. The findings suggest that dietary composition can contribute to glycemic management in people with type 2 diabetes, alongside other components of diabetes care. Because this was a 5-week controlled feeding study and a secondary analysis, the results primarily demonstrate short-term changes in glycemic biomarkers rather than long-term clinical outcomes. Nevertheless, the study adds evidence supporting a DASH-style eating pattern adapted for diabetes as a potential nutritional strategy for improving glycemic control.

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