The DASH diet for blood pressure, explained simply

The DASH diet is an eating pattern built to lower blood pressure: plenty of vegetables, fruit, wholegrains and low-fat dairy, moderate fish, poultry, beans and nuts, and much less sodium, red meat and sugar. Mayo Clinic reports that eating this way can lower readings by up to 11 mmHg.

DASH stands for Dietary Approaches to Stop Hypertension, and DASH diet blood pressure research goes back roughly three decades of studies funded by the National Heart, Lung, and Blood Institute (NHLBI). It is not a fad, a cleanse or a brand. It is a set of daily serving targets, and once you see the numbers it is much less intimidating than it sounds.

What the DASH diet blood pressure trials actually found

Three NHLBI-funded studies do most of the heavy lifting here.

The original DASH trial enrolled 459 adults, some with confirmed high blood pressure and some without, and compared three diets that all contained 3,000 mg of sodium a day: a typical American diet, that same diet plus extra fruit and vegetables, and the DASH pattern. Every meal was provided. After eight weeks, both of the improved diets beat the typical American diet, but the DASH group had the largest drop. Follow-up reports found DASH also lowered LDL cholesterol.

That first result is the one worth holding onto. Simply adding fruit and vegetables helped. The full pattern helped more.

The DASH-Sodium trial put 412 adults on either a typical American diet or DASH, at three sodium levels: 3,300 mg (close to the current US average of about 3,600 mg), 2,300 mg, and 1,500 mg. Blood pressure fell with each reduction in sodium, on both diets. DASH combined with the lowest sodium level did best of all, and the benefits showed up in people with and without hypertension, in women and men, and regardless of race or ethnicity. A follow-up found that the people who started with the highest readings gained the most.

The PREMIER trial tested whether it works outside a research kitchen, with 810 participants and no food provided. Blood pressure fell in all three groups, but the group that combined counselling, more physical activity and the DASH diet had the biggest reductions.

Beyond blood pressure, the NHLBI reports that this body of research shows DASH improves the lipid panel, supports weight loss, and reduces the risk of type 2 diabetes and heart disease.

The DASH plate: daily servings at 2,000 calories

Here is the plan in one table’s worth of numbers. These are the NHLBI targets for a 2,000 calorie day, which suits many moderately active adults. If you eat more or less than that, the targets scale.

• Wholegrains: 6 to 8 servings a day
• Vegetables: 4 to 5 servings a day
• Fruit: 4 to 5 servings a day
• Fat-free or low-fat dairy: 2 to 3 servings a day
• Lean meat, poultry and fish: 6 ounces or less a day
• Nuts, seeds and legumes: 4 to 5 servings a week
• Fats and oils: 2 to 3 servings a day
• Sweets and added sugars: 5 servings or less a week
• Sodium: 2,300 mg a day, or 1,500 mg for a bigger effect

The NHLBI is specific that most of your grain servings should be wholegrain, and that the original DASH study ran at 27 per cent of calories from fat.

What a serving actually is

This is where most people go wrong, because DASH servings are smaller than restaurant portions. Using the NHLBI’s definitions:

• Grains: one slice of bread, one ounce of dry cereal, or half a cup of cooked rice, pasta or porridge
• Vegetables: one cup of raw leafy greens, or half a cup cut up, raw or cooked
• Fruit: one medium fruit, half a cup fresh, frozen or tinned, or a quarter cup dried
• Dairy: one cup of milk or yoghurt, or an ounce and a half of cheese
• Meat, poultry and fish: one ounce cooked, or one egg
• Nuts, seeds and legumes: a third of a cup of nuts, two tablespoons of seeds or nut butter, or half a cup of cooked beans
• Fats and oils: one teaspoon of oil or soft spread, or two tablespoons of salad dressing

Six to eight grain servings sounds enormous until you realise a sandwich is two and a bowl of porridge is one.

How to start without overhauling your kitchen

You do not need a DASH week one. Pick the gap that is widest for you and close it first.

If your vegetables are low, add one serving to a meal you already cook. Frozen counts.

If your sodium is high, the win is not the salt pot. Most sodium in a typical diet comes from packaged and restaurant food, which is why the American Heart Association and the US Centers for Disease Control and Prevention both point people at labels first. Swap one packaged item a week for a home-cooked version.

If your grains are refined, switch bread, rice or pasta to the wholegrain version. Same meal, different packet.

If snacks are the problem, move unsalted nuts and fruit to eye level and the crisps out of sight.

Our guide to how to lower blood pressure covers the wider habit set, 12 daily habits that lower blood pressure naturally breaks it into small steps, and foods that lower blood pressure turns the DASH pattern into a grocery list.

How long before it shows up in your readings?

Give it weeks, not days. The trials ran for eight weeks to six months, and blood pressure fluctuates naturally through the day, so a single reading after a good week tells you nothing. Take readings at the same time of day, average two or three measurements taken a minute apart, and compare your weekly average over a month or two. That is the only honest way to see whether the change is working.

When to see a doctor

• Seek emergency care for a reading higher than 180 systolic or higher than 120 diastolic alongside chest pain, shortness of breath, weakness or numbness, vision changes, difficulty speaking or a severe headache.
• Book an appointment if your home average sits at 130/80 mmHg or above, if it is climbing over weeks, or if you have diabetes, kidney disease or heart problems.
• Check before making big changes if you have kidney disease or take medicines affecting potassium, since a high-potassium diet is not right for everyone.

This page is general information and does not replace advice from a healthcare professional who knows your history.

Frequently asked questions

How much does the DASH diet lower blood pressure? Mayo Clinic reports up to 11 mmHg for people with high blood pressure. The NHLBI’s DASH-Sodium trial found the effect was larger when the pattern was combined with a lower sodium intake, and that people starting from the highest readings benefited most.

Is the DASH diet the same as a low-salt diet? No. Sodium reduction is part of it, but the DASH pattern also raises potassium, magnesium, calcium and fibre through food. The DASH-Sodium trial showed that combining both beat doing either one alone.

Can I follow DASH if I am vegetarian? Yes. The plan is already plant-heavy, and the meat allowance is a ceiling rather than a target. Legumes, nuts, seeds and dairy cover the protein groups, and the NHLBI notes the original study diets were not vegetarian but did not rely on specialty foods either.

Do I have to count servings forever? No. Counting is a calibration exercise for a few weeks so you learn what a serving looks like. After that most people run on habit and check in occasionally.

---

Last reviewed: August 2026

Sources: National Heart, Lung, and Blood Institute (DASH Eating Plan; Following DASH; Health Benefits of DASH, covering the DASH, DASH-Sodium and PREMIER trials); Mayo Clinic (10 ways to manage high blood pressure without medicine; DASH diet); American Heart Association (sodium and potassium guidance); US Centers for Disease Control and Prevention (sodium).

---

Start this habit in CardioVibe

Pick one DASH swap this week, then log your readings in CardioVibe and watch your weekly average rather than any single number. It works alongside your medical care, never instead of it.