Lowering Blood Pressure Without Medication:
A Practical, Evidence-Based Guide

Lifestyle changes can lower blood pressure as much as a single medicine, and they're the first step recommended for anyone with raised or high blood pressure. In a landmark US trial, a diet rich in fruit, vegetables and low-fat dairy combined with less salt lowered systolic blood pressure by 11.5 mmHg in people with high blood pressure. Losing about 5 kg lowers systolic pressure by around 4-5 mmHg. Exercise helps too, and a large analysis of 270 trials found that isometric exercises, such as wall squats and handgrips, lowered systolic pressure by about 8 mmHg. Salt matters especially in Sri Lanka, where adults eat about 8.3 g a day, well above the recommended limit of 5 g. Swapping regular salt for a potassium-enriched salt substitute cut strokes, heart attacks and deaths in a trial of nearly 21,000 people. This guide explains which changes work best, how much each can achieve and how to put them into practice.

Key numbers

How lifestyle lowers blood pressure

Blood pressure depends on how much blood the heart pumps, how much fluid is in the circulation and how relaxed or stiff the blood vessels are (see Blood Pressure Explained). Lifestyle changes act on all three: less salt and more potassium reduce fluid retention, weight loss and exercise reduce the workload on the heart and improve how blood vessels relax, and less alcohol and better sleep calm the nervous system's effect on blood vessels. The effects of different changes add up, so combining several gives the biggest reduction.

What the evidence shows

Salt and potassium: the biggest dietary lever. Most salt in the diet comes from food that's already salty or processed. In a 2020 study of 328 Sri Lankan adults using 24-hour urine collections, the most accurate method, average salt intake was 8.3 g a day, 1.6 times the World Health Organization's recommended maximum of 5 g, and 69.5% ate more than 5 g. Potassium intake was only about 1,265 mg a day, far below recommendations, giving a sodium-to-potassium ratio 7 times higher than advised.

In the Salt Substitute and Stroke Study, 20,995 older adults in rural China with a history of stroke or high blood pressure replaced their regular salt with a substitute containing less sodium and added potassium. Over 4.7 years, strokes fell from 33.65 to 29.14 per 1,000 person-years, and major cardiovascular events and deaths also fell, with no increase in serious high potassium levels. Salt substitutes aren't suitable for everyone, though: people with kidney disease, or taking medicines that raise potassium, should check with their doctor first.

The DASH eating pattern. The Dietary Approaches to Stop Hypertension (DASH) diet is rich in vegetables, fruit, pulses, nuts, whole grains and low-fat dairy, and low in red meat, sweets and sugary drinks. In the original DASH trial, the diet lowered blood pressure by 11.4/5.5 mmHg in people with high blood pressure. In the follow-up DASH-Sodium trial, combining the DASH diet with low salt lowered blood pressure by 11.5/5.7 mmHg in people with high blood pressure, a reduction the researchers noted was larger than a single medicine typically achieves.

Weight loss. A meta-analysis of 25 trials with 4,874 people found that losing an average of 5.1 kg lowered blood pressure by 4.4/3.6 mmHg, about 1 mmHg of systolic pressure per kilogram. People who lost more than 5 kg saw larger falls, of about 6.6/5.1 mmHg. Losing abdominal fat is especially helpful (see What Metabolic Health Really Means).

Exercise: all types help, and isometric exercise stands out. A 2023 analysis in the British Journal of Sports Medicine combined 270 trials with 15,827 people. All types of exercise lowered resting blood pressure:

• Isometric exercise (holding a position, such as a wall squat, plank or handgrip): 8.2/4.0 mmHg
• Combined aerobic and resistance training: 6.0/2.5 mmHg
• Dynamic resistance training (weights or bands): 4.6/3.0 mmHg
• Aerobic exercise (walking, cycling, swimming): 4.5/2.5 mmHg
• High-intensity interval training: 4.1/2.5 mmHg

The isometric wall squat was the single most effective exercise for systolic pressure. Isometric programmes usually involve short holds of about 2 minutes, repeated several times, three times a week. Aerobic exercise remains important for overall heart health and fitness (see Zone 2 Training).

Alcohol. Regular heavy drinking raises blood pressure, and cutting back lowers it, with the biggest effect in people who drink more than two drinks a day. Reducing alcohol also lowers the risk of atrial fibrillation (see Atrial Fibrillation).

Sleep, stress and smoking. Short sleep and untreated sleep apnoea raise blood pressure, so treating them helps (see Sleep and Cardiovascular Health). Stress-reduction techniques such as slow breathing and meditation produce small reductions (see Stress-Reduction Techniques That Work). Smoking doesn't cause lasting high blood pressure in the same way, but it greatly multiplies the damage high blood pressure does to arteries, so stopping is essential.

Practical tips for cutting salt in a Sri Lankan diet

• Cook with less salt and taste before adding more; the palate adjusts within a few weeks.
• Limit high-salt foods such as dried and salted fish, pickles, papadams, processed meats, instant noodles, salted snacks and bottled sauces.
• Watch hidden salt in bread, short eats and restaurant meals.
• Flavour with lime, garlic, ginger, curry leaves, pepper and spices instead of salt.
• Eat more potassium-rich foods: vegetables, leafy greens, fruit such as bananas and papaya, pulses and king coconut water.

Recommendations by scenario

Practical notes

Lifestyle changes are powerful: cutting salt and eating a DASH-style diet can lower systolic pressure by more than 10 mmHg, isometric exercise by about 8 mmHg, and losing weight by about 1 mmHg per kilogram. The effects add up, and even small reductions lower the risk of stroke and heart disease (see Hypertension and Longevity). In Sri Lanka, reducing salt and increasing potassium-rich foods is one of the most valuable changes. Monitoring your blood pressure at home shows whether your changes are working (see Home Blood Pressure Monitoring).