The DASH diet, long recognized as a heart-protective eating pattern, may offer benefits for a group at higher cardiovascular risk, according to a new study.
Originally developed to lower blood pressure, DASH stands for Dietary Approaches to Stop Hypertension. It is a flexible eating framework built around whole, minimally processed foods, with an emphasis on nutrients like potassium, calcium, magnesium, and fiber. Most previous research on the diet has focused on the general population or people with type 2 diabetes.
The new longitudinal study changes that picture. It examined people with type 1 diabetes, who already face a two to four times higher risk of developing cardiovascular disease compared to those without the condition. Relatively little is known about how dietary patterns affect the specific blood markers used to monitor that risk in this group.
About the study
Researchers used data from the Coronary Artery Calcification in Type 1 Diabetes (CACTI) study, which followed participants over three years. The study included 563 adults with type 1 diabetes and 692 adults without diabetes.
Researchers scored adherence to three well-known healthy eating patterns: the DASH diet, the Alternate Healthy Eating Index (AHEI-2010), and the Mediterranean-Style Dietary Pattern Score (MSDPS). They then examined how those scores related to four blood markers: homocysteine, high-sensitivity C-reactive protein (hs-CRP), fibrinogen, and PAI-1. The analysis accounted for age, sex, BMI, blood pressure, cholesterol, smoking, and physical activity.
DASH was the only pattern linked to lower homocysteine and PAI-1 across both groups
Of the three eating patterns studied, only the DASH diet consistently lowered both homocysteine and PAI-1 in people with type 1 diabetes and those without. The other two patterns showed some association with homocysteine, but neither held up for PAI-1 across both groups.
The effect was modest but consistent. For every one-point increase in DASH diet score, homocysteine dropped by roughly 0.5% and PAI-1 dropped by around 1% in both groups.
Why these two markers matter
Homocysteine is an amino acid in the blood. At high levels, it can damage blood vessel walls and raise the risk of clotting, stroke, and heart disease. Elevated levels are often tied to B-vitamin deficiency or certain genetic factors.
PAI-1 is a protein that controls how well the body breaks down blood clots. When it is too high, clots are harder to clear, which is linked to inflammation and plaque buildup in the arteries. Both are among the heart health markers routinely tracked in people with type 1 diabetes because of their elevated heart disease risk.
What eating the DASH way actually looks like
As described in the study, all three dietary patterns focus mainly on eating lots of plants, healthy fats, and fiber, and limiting red meat, added sugar, and sodium. For the DASH diet specifically, that translates to vegetables and fruits as the foundation of most meals, whole grains such as brown rice, oats, and whole wheat bread, low-fat dairy, legumes and nuts, lean proteins like fish and poultry over red and processed meats, low sodium by limiting added salt and high-sodium packaged foods, and limited added sugar by cutting back on sweetened drinks and processed sweets.
The study’s conclusion noted that future research, including randomized controlled trials, into specific DASH food groups such as low-fat dairy, whole grains, and low intake of sodium and added sugar would help clarify which components most directly affect homocysteine and PAI-1 in people with type 1 diabetes.
The takeaway
This study adds evidence that the DASH diet’s heart benefits extend beyond the general population. For people with type 1 diabetes, who face a significantly elevated risk of heart disease and are routinely monitored for inflammatory and clotting markers, higher DASH diet adherence may be one of the most practical, evidence-backed dietary tools available.
