How to lower blood pressure: what the evidence shows
Lifestyle changes can lower blood pressure by about as much as a single medication. The biggest effects come from a low-salt, DASH-style eating pattern, regular exercise (especially held exercises like wall sits), weight loss, and cutting back on heavy drinking. The effects add up, and they work alongside any treatment you're already on.
If you've been told your blood pressure is high, it can feel like a number that only goes one way. The evidence says otherwise. Blood pressure responds to what you eat, how you move, how much you drink and what you weigh, and the changes that move it are well studied and measurable.
How much can lifestyle changes lower blood pressure?
Often by about as much as one medication. Across 354 trials, one blood pressure medication at a standard dose lowered systolic pressure (the top number) by about 9 mmHg on average (Law et al., BMJ, 2003). A low-sodium DASH eating pattern lowered it by 11.5 mmHg in people with high blood pressure (Sacks et al., NEJM, 2001).
That doesn't make lifestyle a replacement for treatment. It means the two work together, and their effects add up.
Why does a few mmHg matter?
Because small drops carry a lot of weight. Across 123 studies and more than 600,000 people, every 10 mmHg drop in systolic pressure reduced major cardiovascular events by 20%, stroke by 27%, heart failure by 28% and deaths from any cause by 13% (Ettehad et al., The Lancet, 2016).
Most of this evidence comes from treatment trials, but the benefit appears to come largely from the drop in pressure itself (Law et al., BMJ, 2009). A lower number is a lower risk.
Which changes lower blood pressure the most?
Change | Typical systolic drop | Source |
Low-sodium DASH eating pattern | About 11.5 mmHg (in people with high blood pressure) | Sacks, NEJM 2001 |
Isometric exercise, such as wall sits | About 8.2 mmHg | Edwards, BJSM 2023 |
Combined aerobic and strength training | About 6 mmHg | Edwards, BJSM 2023 |
Halving alcohol, for heavier drinkers | About 5.5 mmHg | Roerecke, Lancet Public Health 2017 |
Weight loss | About 1 mmHg per kg lost | Neter, Hypertension 2003 |
A few things to know about these numbers:
They are averages from separate studies, so they don't simply add together, though combining changes generally helps.
Alcohol matters most for heavier drinkers. The biggest drops came in people drinking six or more drinks a day who roughly halved their intake; at two or fewer a day, cutting back made no significant difference. (Those trials used 12 g drinks. A New Zealand standard drink is 10 g.)
Maintenance matters. Over two years or more, the effect of weight loss on blood pressure tends to be about half what short-term studies suggest (Aucott et al., 2005). That's a reason to build changes you can keep.
Does lifestyle change work better if your blood pressure is higher?
Yes. The higher your starting point, the more there tends to be to gain. With a low-sodium eating pattern, the expected drop in systolic pressure rose with starting blood pressure:
Starting systolic pressure | Expected reduction |
Below 130 mmHg | About 5.3 mmHg |
130–139 mmHg | About 7.5 mmHg |
140–149 mmHg | About 9.7 mmHg |
150 mmHg or above | About 20.8 mmHg |
Juraschek et al., JACC, 2017
Which exercise lowers blood pressure the most?
All the main types help, but held, static (isometric) exercises came out on top. A 2023 analysis of 270 trials found isometric exercise lowered systolic pressure by about 8.2 mmHg, compared with about 6 mmHg for combined training and about 4.5 mmHg for aerobic exercise such as walking or cycling (Edwards et al., BJSM, 2023).
The wall sit was the single most effective exercise: lean against a wall, slide down as if sitting on an invisible chair, and hold. It needs no equipment and very little time. If your blood pressure is very high, or you have heart disease, check with a doctor before you start.
Is salt the whole story?
Salt is a big part of it, but potassium matters too, because it helps balance sodium's effect. In a trial of more than 20,000 older, higher-risk adults in rural China, swapping regular salt for a potassium-enriched salt substitute led to about 14% fewer strokes over nearly five years, along with fewer cardiovascular events and deaths (Neal et al., NEJM, 2021).
One important caution: potassium-enriched salt isn't suitable for everyone. If you have kidney disease or take certain blood pressure medications, check with your doctor before switching.
Can you reduce your blood pressure medication?
Sometimes. As blood pressure comes down, some people end up needing less treatment. Others need the same treatment and gain extra protection from the lower pressure. Either way, any change to medication is a decision to make with the doctor who prescribes it, and a record of your home readings makes that conversation much easier.
What simple changes can you start today?
Salt and eating
Check labels. Bread, processed meats, sauces and stock cubes are major hidden sources of salt. Cook with herbs, spices, garlic or lemon instead.
Eat the DASH way: more vegetables, fruit, legumes, nuts, whole grains and low-fat dairy.
Alcohol
Count in New Zealand standard drinks (10 g each) and build in alcohol-free days. If you drink more than two a day, cutting back is one of the most effective changes you can make.
Movement and weight
Try wall sits, a few short held sets a few times a week, and walk most days.
Every kilogram counts: about 1 mmHg lower systolic pressure for each kilogram lost.
Stress
Practise slow breathing and protect your sleep. Notice when stress shows up as an extra drink, salty convenience food or a skipped walk.
Measure at home
Use a validated upper-arm cuff. Sit quietly for five minutes, back supported, feet flat, arm at heart level. Take two readings a minute apart, at the same time each day, and keep a log to share with your doctor.
What tests give a clearer picture of your blood pressure?
A single clinic reading is a snapshot. A fuller picture shows what's driving your blood pressure, and where change will help most:
24-hour ambulatory blood pressure. A cuff worn for a day and night takes readings automatically. It's the most accurate measure, and it picks up readings that are only high in the clinic, only high outside it, or don't fall overnight as they should.
Cortisol rhythm. Cortisol, your main stress hormone, normally peaks on waking and falls through the day. A salivary test measures it at several points to show whether it stays raised when it should be falling. In a US study of 412 adults with normal blood pressure, those with higher stress hormone levels were more likely to develop high blood pressure, and each doubling of cortisol was linked with a 90% higher risk of cardiovascular events over about 11 years (Inoue et al., Hypertension, 2021). The study was observational, but measuring cortisol turns stress from a vague idea into something you can track.
ApoB and Lp(a). Blood pressure is one part of your overall cardiovascular risk. These tests give a more precise picture of cholesterol-related risk than a standard panel.
Cortisol rhythm, ApoB and Lp(a) aren't part of a standard blood pressure check. In the Metabolic Clinic, all of these tests are included.
How does Autonomy approach blood pressure?
Knowing what to change is only half of it. Making changes last works best with a team. The American Heart Association notes that effective lifestyle programmes are usually delivered by dedicated multidisciplinary teams, and a 2019 analysis of 19 randomised trials found the greatest reductions in cardiovascular risk came from teams of three or more disciplines (van Namen et al., 2019).
That's how Autonomy's Metabolic Clinic works:
Doctors interpret your full picture, including ambulatory readings, cortisol rhythm and cardiovascular markers, and build a plan around your own results.
Registered nurses carry out your assessments and testing, and track your blood pressure over time.
Medically led health coaches turn the plan into everyday habits across nutrition, movement, sleep and stress, and help you keep them going.
Where to start
If you'd like to know what's realistic for you, start with a clinical Discovery Consultation with one of our doctors: 30 minutes, online or in person, $249, with no obligation. We'll look at your readings, results and history, talk through which changes are likely to make the biggest difference, and explain what the programme would involve.
Dr Janani Krishnaswami (MD, MPH, DipABLM)
Clinical Director, Autonomy Health
Book a Discovery Consultation today.
References:
1. Law MR, Wald NJ, Morris JK, Jordan RE. Value of low dose combination treatment with blood pressure lowering drugs: analysis of 354 randomised trials. BMJ 2003;326:1427.
2. Sacks FM, Svetkey LP, Vollmer WM, et al. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. NEJM 2001;344:3–10.
3. Ettehad D, Emdin CA, Kiran A, et al. Blood pressure lowering for prevention of cardiovascular disease and death: a systematic review and meta-analysis. The Lancet 2016;387:957–967.
4. Law MR, Morris JK, Wald NJ. Use of blood pressure lowering drugs in the prevention of cardiovascular disease: meta-analysis of 147 randomised trials. BMJ 2009;338:b1665.
5. Edwards JJ, Deenmamode AHP, Griffiths M, et al. Exercise training and resting blood pressure: a large-scale pairwise and network meta-analysis of randomised controlled trials. British Journal of Sports Medicine 2023;57:1317–1326.
6. Roerecke M, Kaczorowski J, Tobe SW, et al. The effect of a reduction in alcohol consumption on blood pressure: a systematic review and meta-analysis. Lancet Public Health 2017;2(2):e108–e120.
7. Neter JE, Stam BE, Kok FJ, Grobbee DE, Geleijnse JM. Influence of weight reduction on blood pressure: a meta-analysis of randomized controlled trials. Hypertension 2003;42:878–884.
8. Aucott L, et al. Effects of weight loss in overweight/obese individuals and long-term hypertension outcomes: a systematic review. Hypertension 2005;45:1035–1041.
9. Juraschek SP, Miller ER, Weaver CM, Appel LJ. Effects of sodium reduction and the DASH diet in relation to baseline blood pressure. JACC 2017;70(23):2841–2848.
10. Neal B, Wu Y, Feng X, et al. Effect of salt substitution on cardiovascular events and death. NEJM 2021;385:1067–1077.
11. Inoue K, Horwich T, Bhatnagar R, et al. Urinary stress hormones, hypertension, and cardiovascular events: the Multi-Ethnic Study of Atherosclerosis. Hypertension 2021;78(5):1640–1647.
12. van Namen M, et al. Supporting lifestyle modification in patients with obesity or hypertension: a systematic review and meta-analysis of randomised trials. 2019.
