Chapter 16: Lifestyle changes

Why lifestyle change matters

Adopting a heart-healthy lifestyle is fundamental for preventing or delaying the onset of hypertension, lowering elevated blood pressure and reducing cardiovascular risk. People with a healthy lifestyle have blood pressure approximately 4–5 mmHg lower, regardless of genetic risk, than people with an unfavourable lifestyle.

Healthy lifestyle measures can also increase the blood-pressure-lowering effect of medication and reduce the number of drugs needed for control. Every lifestyle intervention tends to have a larger effect when starting blood pressure is higher. Nevertheless, lifestyle change should never delay medication in people for whom antihypertensive treatment has documented benefit and in whom the required reduction cannot be achieved by lifestyle alone.

Although the evidence is limited for some interventions, lifestyle measures appear to provide cardiovascular benefits that may extend beyond their effect on blood pressure. The best-established interventions shown to reduce premature cardiovascular disease and mortality are weight loss, the DASH diet, lower salt intake, higher potassium intake, regular physical activity and structured exercise, and moderation of alcohol. Stopping smoking and other healthy behaviours are also important independently of blood pressure.

Other non-pharmacological interventions, such as polyphenols, coffee and tea, and stress-reduction treatments, have been reported to lower blood pressure. The supporting clinical trials, however, are generally less robust and less convincing.

Poor long-term adherence is the Achilles heel of non-pharmacological strategies. Maintaining a lifestyle change can be difficult when it conflicts with work or household habits and needs. Some interventions also cost money that may not be reimbursed by healthcare providers. After prescribing lifestyle change, clinicians should therefore establish follow-up that checks adherence and whether the therapeutic goal has been reached, reducing the risk that uncontrolled blood pressure persists for a long time.

Weight reduction

Overweight and obesity are directly associated with higher blood pressure, while weight-loss interventions are well-established strategies for lowering it.

One meta-analysis found that a calorie-restricted diet reduced systolic pressure by 6.5 mmHg and diastolic pressure by 4.6 mmHg in adults with hypertension.

Among lifestyle interventions in people with hypertension, calorie restriction ranked first for lowering systolic and diastolic pressure. The same analysis concluded that each kilogram of body-weight loss was associated with an approximately 1 mmHg reduction in both systolic and diastolic pressure. Stress-related factors such as sympathetic activation also improved, and all-cause mortality was reported to fall by 15% after weight-loss interventions, regardless of age.

Moderate weight loss is therefore a key recommendation and is ideally achieved through a combination of a calorie-restricted diet and exercise.

Achieving and maintaining weight loss through behavioural change is often difficult over long follow-up, although it is possible. Weight cycling, with repeated loss and regain, is common enough to deserve attention because it may adversely affect blood pressure, cardiovascular risk and metabolism. For people who do not reach their weight goal through non-pharmacological measures, drug treatment can be considered. Evidence for the blood-pressure effect of weight-loss drugs remains limited, based on a small number of studies, and these drugs may cause unwanted adverse effects.

GLP-1 receptor agonists reduce body weight and lower blood pressure by a few mmHg at the same time, which can be useful for people with diabetes and obesity. Bariatric surgery is an effective long-term strategy for treating arterial and vascular risk factors in people with severe obesity and may be considered when the measures above have failed.

Greater initial weight loss and stronger adherence to lifestyle advice predict more successful weight loss than many other factors. A weight-management programme should always be individualised, with realistic goals, tailored diet and exercise plans, and close follow-up to support motivation and address behavioural challenges.

Reducing sodium intake

There is strong evidence linking higher sodium intake with higher blood pressure in people with hypertension and in the general population. The relationship between lower-sodium diets and better blood-pressure control has also been widely demonstrated in randomised trials and confirmed by meta-analysis.

The reduction is often greater in people with hypertension and in other groups, including older adults, people with diabetes, metabolic syndrome or chronic kidney disease, and some non-White populations. Sodium restriction is also recommended in resistant hypertension to reduce the number of drugs needed for control.

A recent meta-analysis found that lifestyle interventions reducing sodium intake below 100 mmol, approximately 5.8 g of salt per day, produced an average reduction of about 5/2 mmHg in systolic/diastolic pressure in people with hypertension.

Five grams of table salt contains approximately 2 g of sodium, or 87 mmol of sodium.

Another meta-analysis found a linear reduction in blood pressure when sodium intake was reduced to as little as 800 mg per day. Reducing dietary sodium from approximately 3.6 g per day to about 2.7 g per day was also associated with an 18–26% reduction in cardiovascular disease. Whether unlimited sodium restriction is the best strategy remains uncertain and debated: some studies have associated an intake below approximately 3.5 g of sodium per day with a further blood-pressure reduction but higher mortality, both in people with hypertension and in the general population.

Although some intervention studies are available, the lack of appropriate long-term randomised trials comparing different degrees of sodium restriction on clinical outcomes is the most important limitation in this field. Larger, longer and more precise intervention studies are still needed.

Increasing dietary potassium

Dietary potassium is related to blood pressure, and recent data suggest a U-shaped relationship. Sufficient potassium appears desirable for achieving a lower pressure, but excessive intake should be avoided.

Potassium supplementation, particularly at 75–125 mmol per day, can lower blood pressure, especially in adults with hypertension, people consuming excess sodium and Black adults. A typical dose of 60 mmol, equivalent to 1,380 mg of potassium chloride, lowers pressure by approximately 2 mmHg in normotensive adults and 4–5 mmHg in adults with hypertension. The effect may be twice as large in people consuming a high-sodium diet.

The large SSaSS randomised trial reported that increasing potassium intake by replacing sodium—substituting 25% of sodium chloride with potassium chloride in salt—reduced stroke, cardiovascular disease and mortality in people at increased cardiovascular risk who had low potassium and high sodium intake at baseline.

A recent meta-analysis further supported the international population target of 90 mmol of potassium per day, equivalent to approximately 3,500 mg per day.

Most trials provided potassium as potassium-chloride tablets, but dietary modification produced a similar blood-pressure response. Because potassium-rich diets tend to be heart-healthy, they are preferred to potassium pills when safe.

Good dietary sources include fruit and vegetables, low-fat dairy products, fish, selected meats, nuts and soy products. Four to five servings of fruit and vegetables usually provide 1,500–3,000 mg of potassium. This can be achieved through a dietary pattern such as DASH, which is naturally rich in potassium.

Potassium advice must be individualised in chronic kidney disease, hyperkalaemia, dialysis and when medicines that raise potassium are used. A higher potassium intake should not be started without clinical review in these settings.

Increasing daily activity and regular exercise

The acute pressor response to dynamic and isometric exercise does not conflict with the benefits of regular long-term exercise. In fact, habitual physical activity is inversely associated with the development of hypertension. The minimum recommended level of 150 minutes per week is associated with approximately a 6% lower risk of developing hypertension.

The blood-pressure-lowering effect of structured exercise has repeatedly been demonstrated in randomised controlled trials, particularly for dynamic aerobic exercise and, to a lesser extent, dynamic resistance and static isometric exercise. The effect has been documented across age, sex and racial groups.

Average systolic pressure falls by approximately 2–4 mmHg with exercise in normotensive adults and by 5–8 mmHg in adults with hypertension.

For intensity, moderate aerobic exercise, corresponding to 40–60% of heart-rate reserve, is recommended for prevention and treatment. Many people with hypertension, however, are older, have comorbidities or have limited exercise capacity. In this context, a Cochrane meta-analysis of 73 trials provided moderate-certainty evidence that walking produces meaningful blood-pressure reductions. In people with hypertension, daily exercise is preferable when possible to reduce the problem of post-exercise hypotension.

An active lifestyle and regular exercise also benefit many other health and cardiovascular-risk domains across age, sex and blood-pressure categories. Blood-pressure and cardiometabolic benefits have been reported even with low-intensity activity, such as six minutes of movement per hour, in people who sit for long periods. Observational studies also suggest that an active lifestyle prevents cardiovascular disease regardless of blood-pressure level. Risk reduction continues across the full range of activity, with the steepest improvement among the least active people.

Moderating alcohol intake

Large observational studies show a strong positive linear association between alcohol consumption and blood pressure.

Epidemiological data rely largely on self-reported alcohol intake, often expressed as drinks per day. Sex differences in alcohol metabolism, including lower first-pass metabolism in women, and differences in distribution related to body composition may explain why recommended upper limits for pure alcohol have often been higher for men than for women. This contrasts with the observation that the worldwide effect of alcohol on mortality is more than four times greater in men than in women.

Earlier studies suggested lower cardiovascular disease, particularly coronary disease, with light drinking compared with abstinence. The apparent protective effect of low-to-moderate intake seems largely attributable to a healthier lifestyle in those individuals and becomes smaller after full adjustment for confounding and coexisting factors. Many studies indicate a continuous, non-linear positive relationship between alcohol intake and blood pressure.

The risk of hypertension increases in both men and women when daily consumption reaches at least one or two drinks, approximately 10–20 g of alcohol per day. An important meta-analysis of 36 randomised controlled trials including 2,865 participants, 14% of whom were women, found that reducing alcohol intake close to abstinence was associated with a 3.3/2.0 mmHg reduction in systolic/diastolic pressure.

A dose-dependent effect was particularly clear in heavier drinkers. In people consuming about six drinks per day at baseline, reducing intake by approximately 50% lowered systolic/diastolic pressure by about 5.5/4.0 mmHg. Trial and observational evidence also supports a hypertensive effect of excessive alcohol use.

In addition to hypertension, excessive alcohol intake is an important risk factor for intracranial haemorrhage. Binge drinking should therefore be avoided, and people at high risk of intracranial bleeding should be counselled accordingly.

Guidelines differ in their upper limits and definitions of a standard drink, and sex-specific limits remain debatable. In general, moderation and alcohol-free days during the week are advised for people who drink, both to improve blood-pressure control and to support overall health.

Stopping tobacco

Tobacco smoking is the largest preventable cause of death and substantially increases cardiovascular risk. Compared with non-smokers, smokers more often have masked hypertension, documented by the difference between routine office measurements and daytime ambulatory blood pressure.

Each cigarette activates the sympathetic nervous system and can raise blood pressure for approximately 30 minutes. Repeated rises and falls therefore increase daytime blood-pressure variability. Smoking may also weaken the pressure-lowering effect of some drugs, such as beta-blockers.

Tobacco history should be asked about and confirmed carefully. Smokers should be encouraged and offered cessation counselling. Second-hand smoke also matters and is associated with cardiovascular risk and higher 24-hour pressure. Brief clinician advice can help when time is limited, although combining behavioural support with medication increases the chance of success compared with brief advice alone. Greater intensity of behavioural support, measured by contact time, number of contacts and programme duration, is associated with a modestly greater likelihood of quitting.

In recent decades, waterpipe smoking has become a major and rapidly growing alternative to conventional tobacco in the global tobacco epidemic. E-cigarettes, initially marketed as possible cessation aids, have attracted both smokers and non-smokers. A meta-analysis reported that these supposedly safer alternatives can acutely increase blood pressure and heart rate and may also be associated with higher cardiovascular risk. The few available studies found no clear difference in cardiovascular disease occurrence between waterpipe and conventional tobacco smokers. Although the evidence about cardiovascular effects of e-cigarettes and waterpipes is indirect and based largely on small, non-randomised studies of moderate quality and short follow-up, it does not support considering them safe products. Health professionals should therefore be cautious about recommending e-cigarettes to patients or the public.

Other dietary interventions

Diet is an important modifier of vascular health and blood pressure. Targeting the overall dietary pattern has synergistic and cumulative effects that go beyond individual foods or nutrients.

The most established dietary approaches for lowering blood pressure are DASH and the Mediterranean diet. DASH has the strongest evidence for blood-pressure reduction and encourages whole grains, fruit, vegetables and low-fat dairy products. It also increases potassium, calcium, magnesium and fibre intake.

High-quality evidence shows that DASH substantially lowers systolic and diastolic pressure regardless of hypertension status. Even modest adherence is associated with lower all-cause and cause-specific mortality. Greater adherence to a Mediterranean diet has also been associated with a 10% reduction in cardiovascular events or mortality.

Stronger adherence to DASH further improves risk reduction. Vegetarian, paleo, low-carbohydrate, low-glycaemic-index, high-protein and low-fat diets have also been reported to lower blood pressure, but the findings are less consistent and the evidence is lower quality.

Coffee can cause a small, short-term pressor response, but recent data suggest that regular moderate consumption does not adversely affect blood pressure or cardiovascular health. Acute coffee intake also appears not to increase atrial ectopy. Depending on the CYP1A2 genetic profile, some studies suggest that high caffeine intake may even protect non-smokers—but not smokers—from hypertension.

Improving stress management

Stress and anxiety are associated with a higher risk of hypertension and cardiovascular events. People experiencing severe mental distress may develop a sudden rise in blood pressure that returns toward normal when the distress improves. Increasing evidence also links severe psychological trauma with a higher risk of hypertension.

Recent studies suggest promising effects from interventions that reduce mental and physical stress, not only on stress and mood variability but also on systolic and diastolic pressure, although the quality of evidence is low.

Meditation and breathing control, for example through yoga, are among the better-supported stress-reduction interventions for lowering blood pressure, although their effect is smaller than that of the major lifestyle interventions.

Noise and air-pollution exposure

Environmental noise and air pollution are major cardiovascular hazards, particularly in urban areas. Both are environmental stressors associated with higher blood pressure, incident hypertension and HMOD, including vascular stiffening.

Air pollution is a complex mixture of gaseous and particulate components, while noise exposure is largely related to traffic. Clinical and experimental studies suggest that the two exposures may share biological pathways that ultimately cause vascular inflammation and endothelial dysfunction, mediating higher blood pressure. Additional studies have shown that reducing pollution or noise reduces blood pressure and related intermediate pathways, supporting a causal relationship.

Reducing traffic noise and air pollution is therefore important public-health policy at global and national levels and may contribute to better blood-pressure control and cardiovascular health. At an individual level, escaping harmful exposure is often difficult. People with hypertension may nevertheless reduce exposure by changing the location, timing and type of outdoor activity, and by trying to reduce indoor noise and air pollution.

Studies mentioned

• Meta-analyses support lower sodium intake and show dose-related blood-pressure reduction.
• Walking trials, including a Cochrane review of 73 trials, support regular activity, although certainty varies by intervention.
• A meta-analysis of 36 randomised trials found that reducing alcohol intake lowered blood pressure, particularly in heavier drinkers.
• DASH and Mediterranean dietary patterns have the strongest practical evidence among dietary approaches, but diet must be adapted to kidney disease and individual needs.