The DASH eating plan is not really a “diet” per se. Because it does not require special (often expensive) foods or supplements or preparation. The plan incorporates—in a healthful way—normal, every-day groceries from your store-of-choice. Originally developed to reduce hypertension (high blood pressure), the DASH eating plan has been shown to be beneficial in reducing blood sugar levels and other lifestyle ailments. Follow this link for more details.
https://www.nhlbi.nih.gov/health-topics/dash-eating-plan