The DASH diet, long known for its heart-protective qualities, may offer benefits for people with type 1 diabetes, a group at higher risk for cardiovascular disease, according to a new study.
Originally designed to lower blood pressure, the DASH diet focuses on whole, minimally processed foods rich in potassium, calcium, magnesium, and fiber. Most prior research on the diet has focused on the general population or people with type 2 diabetes.
People with type 1 diabetes face two to four times the risk of developing cardiovascular disease compared to those without the condition. However, little is known about how diet affects specific blood markers used to monitor that risk.
The study used data from the Coronary Artery Calcification in Type 1 Diabetes study, which followed 563 adults with type 1 diabetes and 692 adults without diabetes over three years. Researchers measured how closely participants followed three eating patterns: the DASH diet, the Alternate Healthy Eating Index, and the Mediterranean-Style Dietary Pattern Score.
They then looked at how those scores related to four blood markers: homocysteine, high-sensitivity C-reactive protein, fibrinogen, and PAI-1. The analysis accounted for age, sex, BMI, blood pressure, cholesterol, smoking, and physical activity.
Of the three patterns, only the DASH diet was linked to lower levels of homocysteine and PAI-1 in both groups. The other two patterns showed some connection to homocysteine, but not to PAI-1 across both groups.
The effect was small but steady. For every one-point increase in DASH diet score, homocysteine dropped by about 0.5 percent and PAI-1 dropped by about 1 percent in both groups.
Why These Markers Matter
Homocysteine is an amino acid that, at high levels, can damage blood vessel walls and raise the risk of clotting, stroke, and heart disease. High levels are often linked to B-vitamin deficiency or genetic factors.
PAI-1 is a protein that controls how the body breaks down blood clots. When levels are too high, clots are harder to clear, which is tied to inflammation and plaque buildup in the arteries. Both markers are routinely tracked in people with type 1 diabetes because of their higher heart disease risk.
What the DASH Diet Involves
The three dietary patterns studied all focus on eating plenty of plants, healthy fats, and fiber, while limiting red meat, added sugar, and sodium. For the DASH diet specifically, that means:
Vegetables and fruits as the base of most meals. Whole grains such as brown rice, oats, and whole wheat bread. Low-fat dairy, which sets DASH apart from the Mediterranean pattern. Legumes and nuts for plant protein and fiber. Lean proteins like fish and poultry over red and processed meats. Low sodium by limiting added salt and high-sodium packaged foods. Limited added sugar by cutting back on sweetened drinks and processed sweets.
The study noted that future research, including randomized trials, should look at which parts of the DASH diet, such as low-fat dairy, whole grains, and low sodium and sugar intake, most directly affect homocysteine and PAI-1 in people with type 1 diabetes.
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 higher risk of heart disease and are monitored for inflammatory and clotting markers, following the DASH diet may be a practical, evidence-backed tool.
