DASH Diet Tailored for Diabetes Improves Glycemic Control in Type 2 Diabetes: Study
A DASH-style diet adapted for people with diabetes may help improve blood sugar control in adults with type 2 diabetes, according to a secondary analysis of the DASH4D trial.
The study, published in Diabetes Care, examined 101 adults with type 2 diabetes. Participants had an average age of 67 years, and 65% were women. Researchers compared a diabetes-focused DASH diet with a diet designed to represent typical eating patterns.
The DASH4D diet emphasised fruits, vegetables, whole grains and low-fat dairy, while the comparison diet contained fewer fruits and vegetables and more red meat and sugar-sweetened foods.
Participants followed four diets in random order. Both the DASH4D and comparison diets were tested with higher and lower sodium levels. Each diet period lasted five weeks, with at least a one-week gap between periods. Meals and snacks were prepared by researchers, while calorie intake was adjusted to keep body weight stable.
Compared with the typical US diet, the DASH4D diet reduced fructosamine levels by 5.6 µmol/L. Fructosamine reflects average blood sugar over roughly two to four weeks. Fasting glucose also fell by 4.5 mg/dL, while HbA1c decreased by 0.09 percentage points.
The benefits appeared greater among people who started with higher HbA1c levels. Fructosamine fell by an average of 8.8 µmol/L in participants with HbA1c of 8%-9%, compared with 5.5 µmol/L among those with levels of 7%-7.9% and 3.7 µmol/L among those below 7%. A similar pattern was seen for fasting glucose. About 84% of participants completed all four diet periods, and reported adherence was about 96% of study days.
However, the study had limitations. It excluded people with HbA1c above 9%, subgroup numbers were small, and adherence was partly self-reported.
The findings suggest that a structured DASH-style eating pattern may provide a practical way to support glucose control. Larger and longer studies are needed to determine whether these improvements translate into meaningful long-term diabetes benefits.
REFERENCE: Michael Fang, et al.; Effects of the DASH4D Diet on Biomarkers of Glycemia in Adults With Type 2 Diabetes: A Secondary Analysis of the DASH4D Randomized Clinical Trial. Diabetes Care 2026; dc261062. https://doi.org/10.2337/dc26-1062
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