Key points
- Losing weight brings blood pressure down by roughly 1 mmHg for every kilo lost, in both the top and the bottom number, according to a review of 25 trials.
- Larger losses give larger drops: groups who lost more than 5 kg saw their top number fall by about 6 to 7 mmHg on average.
- Less salt and regular walking lower blood pressure too, so they are worth doing alongside weight loss.
- Your cuff must fit your arm. A cuff that is too small for a larger arm can read up to about 20 mmHg too high.
- Keeping the weight off keeps the benefit. When the kilos came back in a long trial, most of the protection faded too.
- Never stop or change blood pressure tablets on your own. As your weight falls, your doctor may need to review them.
- Talk to your doctor first before you change your food or start a walking plan.
High blood pressure and weight loss: the short answer
Yes, losing weight lowers blood pressure, and the effect is measurable from the first few kilos. On average, each kilo lost takes about 1 mmHg off both the top number and the bottom number.
That figure comes from Neter and colleagues, who pooled 25 randomised trials with 4,874 people. An average loss of about 5 kg lowered the top (systolic) number by 4.4 mmHg and the bottom (diastolic) number by 3.6 mmHg.
Groups that lost more than 5 kg on average saw bigger drops: about 6.6 mmHg off the top number and 5.1 off the bottom. In groups that lost less, the drop was roughly 2.7 and 2.0 mmHg.
A Cochrane review looked only at people already diagnosed with high blood pressure. Weight-loss diets lasting 6 to 36 months led to about 4 kg less body weight and readings about 4.5/3.2 mmHg lower, although the reviewers rated the blood pressure result as low-certainty evidence.
A few mmHg may not sound like much. Yet it is in the same range as cutting salt or walking most days, and those steps can be stacked. Talk to your doctor first, keep taking any tablets you have been given, and use the plan further down.
Why extra weight raises blood pressure
Extra body fat, above all deep fat around the organs, changes how the kidneys, hormones and nerves control pressure. A review by Hall and colleagues estimates that excess weight explains 65 to 75 % of the risk of the most common type of high blood pressure.
In plain words, three things happen at once:
- The kidneys hold on to more salt and water. To get rid of the surplus, the body needs a higher pressure in the blood vessels.
- Fat in and around the kidneys presses on them, and this pressure switches on hormones that tighten blood vessels.
- The body’s alarm system stays turned up. Nerve signals that raise heart rate and squeeze blood vessels become more active, partly through hormones released by fat tissue and through breathing pauses at night.
The same review notes that weight loss lowers pressure in heavier people whose readings are still normal as well as in those with high readings. It also warns that high blood pressure tends to become harder to control the longer extra weight is carried, which is a good reason to start now.
The wider picture of heart and stroke risk is summed up on our page about the health risks of obesity. Loud snoring and breathing pauses can push pressure up at night; read how sleep apnoea affects blood pressure and the heart.
The kidneys and the blood vessels affect each other in both directions. If your doctor has mentioned kidney problems as well, read how salt affects the kidneys and blood pressure.
Your numbers: what the readings mean
A blood pressure reading has two numbers. The top number is the pressure when your heart beats; the bottom number is the pressure when it rests between beats. Both are measured in millimetres of mercury (mmHg).
The table below uses the categories from the American guideline, as set out in the American Heart Association statement on measuring blood pressure; the last row uses the emergency threshold explained further down. One high reading is never a diagnosis: the categories are based on the average of at least two careful readings taken on at least two occasions.
| Category | Top number (mmHg) | Bottom number (mmHg) | What it usually means for you |
|---|---|---|---|
| Normal | Below 120 | and below 80 | Keep up good food, walking and sleep |
| Elevated | 120 to 129 | and below 80 | Lifestyle steps first; ask your doctor when to check again |
| High, stage 1 | 130 to 139 | or 80 to 89 | Weight, salt and walking matter; your doctor decides whether you also need tablets |
| High, stage 2 | 140 or more | or 90 or more | See your doctor soon; lifestyle steps help alongside treatment |
| Very high | Above 180 | and/or above 120 | Get medical advice the same day; call your emergency number if you have symptoms (see below) |
If your top and bottom numbers fall into different rows, the higher row counts. Guidelines in Europe and other regions use different cut-offs, often 140/90 for a diagnosis, so your own doctor decides what your numbers mean and which target suits you.
Many people living with obesity first hear about their blood pressure at a check-up. Write the numbers down each time; a personal record makes it much easier to see whether your food and walking steps are working.
The cuff must fit your arm
A cuff that is too small for your upper arm makes your blood pressure look higher than it really is. For many heavier readers, this is the most useful single check on this page.
In a randomised crossover trial, Ishigami and colleagues measured 195 adults with cuffs of different sizes. In people who needed a large cuff, a regular cuff read the top number about 4.8 mmHg too high. In people who needed an extra-large cuff, the error was about 19.5 mmHg.
That gap can be the difference between “normal” and “stage 2”. The results held across different body sizes and blood pressure levels, so the fix is simple: choose the cuff by arm size, not by body weight.
| Arm circumference | Cuff size to look for |
|---|---|
| 22 to 26 cm | Small adult |
| 27 to 34 cm | Adult (standard) |
| 35 to 44 cm | Large adult |
| 45 to 52 cm | Extra-large adult (sometimes called a thigh cuff) |
To measure your arm, stand with the arm relaxed and wrap a soft tape measure around it halfway between the shoulder and the elbow. Sizes differ slightly between makers, so compare your number with the range printed on the cuff.
If even an extra-large cuff does not fit, the American Heart Association statement says a wrist device can be used instead. It must be a validated device, and your wrist must be held at heart level, because a wrist that is too low or too high gives a wrong reading.
You are also allowed to ask for a larger cuff at the surgery or pharmacy. Our doctor visit checklist helps you mention it when you book.
Measuring at home: a simple routine
Home readings often give a truer picture than a single reading at the doctor’s, because they are taken on many days in your own calm surroundings. They also show you whether your new habits are making a difference.
| Step | Why it matters |
|---|---|
| No coffee, smoking or exercise for 30 minutes before | All three raise blood pressure for a short time |
| Empty your bladder first | A full bladder pushes the reading up |
| Sit quietly for 5 minutes, back supported, feet flat, legs uncrossed | Rest and posture change the numbers; do not talk or text |
| Cuff on a bare upper arm, arm resting on a table at heart level | Sleeves and a hanging arm give false readings |
| Two readings 1 to 2 minutes apart, at the same times each day | Write down the time of your last blood pressure tablet |
| Repeat for about a week, for example before a doctor’s visit | Your doctor looks at the average, not one number |
Some people have high readings only at the clinic (“white-coat” pressure), while others have normal clinic readings but high readings at home (“masked” high blood pressure). Home readings help your doctor tell these apart.
How much each step lowers blood pressure
Weight loss, less salt and walking each lower blood pressure by a few mmHg, and together they can make a real difference. The table shows the average effect in the best studies we found.
| Step | About how much (top/bottom number) | Who was studied | Type of evidence |
|---|---|---|---|
| Losing weight | About 1/1 mmHg per kilo; 4.4/3.6 mmHg for about 5 kg | 25 trials, 4,874 people | Meta-analysis of randomised trials (Neter) |
| Weight-loss diet if you already have high blood pressure | About 4.5/3.2 mmHg with about 4 kg lost | 8 trials, 2,100 people | Cochrane review, low certainty (Semlitsch) |
| Eating about 4.4 g less salt a day | 5.4/2.8 mmHg with high blood pressure; 2.4/1.0 without | 34 trials, 3,230 people | Cochrane review (He) |
| Walking, about 150 minutes a week | 4.1 mmHg off the top number | 73 trials, 5,763 people | Cochrane review, moderate certainty (Lee) |
| Endurance exercise such as brisk walking or cycling | 8.3/5.2 mmHg in groups with high blood pressure | 26 study groups | Meta-analysis (Cornelissen) |
| Drinking less, for people who drank more than 2 drinks a day | Up to 5.5/4.0 mmHg when heavy drinkers halved their intake | 36 trials, 2,865 people | Meta-analysis (Roerecke) |
These effects do not simply add up. Each trial tested one step in different people, and the steps overlap: walking, for example, also helps weight loss. Your own result will be different, so let your home readings and your doctor guide you.
The trials also show that the starting point matters. People who already had high blood pressure usually saw larger drops than people with normal readings, so every step on this page counts most for those who need it most.
Keeping it down: what happens when the weight comes back
The fall in blood pressure lasts as long as the weight stays off. When the kilos return, most of the benefit fades.
The Trials of Hypertension Prevention followed 595 adults on a weight-loss programme and 596 on usual care for three years. They were heavier than average and had readings just below the high range, without tablets.
The programme group lost 4.4 kg in the first 6 months. By 18 months, they were 2.0 kg below their start, and by 36 months only 0.2 kg. Their risk of developing high blood pressure was 42 % lower than the control group’s at 6 months, but only 19 % lower at 3 years.
In a smaller analysis within the same trial, people who lost at least 4.5 kg and kept it off for the next 30 months had a 65 % lower risk. Subgroup results like this need care, but the message is clear: weight you keep off matters more than a big early drop.
Keeping weight off is a skill of its own. Our page on how to keep lost weight off explains the habits that help, such as regular weighing, daily movement and planning for difficult weeks.
Blood pressure tablets while you lose weight
Keep taking your blood pressure tablets exactly as prescribed while you lose weight. As your weight falls, your blood pressure may fall too, and your doctor may then decide to lower or change a dose; that decision belongs with your doctor.
Never stop or change blood pressure tablets on your own. Stopping suddenly can make blood pressure rise again quickly. In some countries blood pressure tablets can be bought without a prescription: ask your doctor before starting or stopping any tablets, and bring your home readings to every review.
Trials show why it is worth telling your doctor about your weight loss plans. In Neter’s review, the bottom number fell more in people who were already taking blood pressure medicine (about 5.3 mmHg) than in people who were not (about 2.9 mmHg).
The TONE trial studied 975 adults aged 60 to 80 whose blood pressure was well controlled on one medicine; 585 of them had obesity. After 3 months of lifestyle changes, their doctors stopped the tablets under close follow-up and watched who needed them again.
Among the people with obesity, the weight-loss programme lowered the chance of high readings returning, tablets being restarted or a heart problem by about 30 %. Weight loss combined with less salt roughly halved it compared with usual care. Heart problems were about as common in every group.
This was a supervised trial, not a self-help method. It shows what good food and walking can do with your doctor’s help, not that you can try it alone.
Feeling dizzy or light-headed
Feeling dizzy when you stand up can mean your tablets now lower your blood pressure more than you need. This can happen as you lose weight, after a long walk, in hot weather or when you have eaten and drunk less than usual.
Sit or lie down until it passes, drink some water and stand up slowly. Write down when it happens and tell your doctor soon, because a dose review may be needed. Do not skip a tablet to solve it yourself.
Some medicine groups can also affect weight or how fast your heart beats during exercise. Our overview of medicines linked to weight gain explains this without telling you to stop anything; ask your doctor or pharmacist about your own tablets.
Salt: the quiet partner of weight loss
Eating less salt lowers blood pressure on its own, and it often goes hand in hand with eating fewer calories. Many salty foods, such as processed meat, salty cheese and takeaway meals, are also rich in fat.
The Cochrane review by He and colleagues combined 34 trials that lasted at least four weeks. People who cut their salt by about 4.4 g a day, a little under a teaspoon, saw their top number fall by about 4 mmHg on average and by 5.4 mmHg if they already had high blood pressure.
The reviewers also found a clear link with the amount: the bigger the cut, the bigger the drop. They suggested that 5 to 6 g of salt a day is a useful target and that 3 g a day would be even better in the long run.
Most salt is already in food when you buy it. You do not need to learn a full list of salty foods; our page on the cardiac diet shows where salt hides in everyday food. Here are the steps that matter most for weight loss:
- Read the label. Compare two breads, sauces or soups and choose the lower-salt one. Some labels give sodium instead of salt: multiply sodium by 2.5 to get salt.
- Cook simple meals at home more often, so you decide how much salt goes in. Herbs, garlic, lemon, chilli and black pepper add flavour without it.
- Watch the extras: stock cubes, soy and fish sauce, pickles, olives, salted white cheese and dried or salted fish add up quickly.
- Plan takeaways and meals out. Choose grilled or steamed dishes and ask for sauces on the side.
“Pink” or “sea” salt is still salt, with almost the same sodium. Salt substitutes that use potassium are not safe for everyone, for example with kidney disease or certain blood pressure tablets, so ask your doctor first.
When you cut salt, the scale often drops a little in the first week. That is mostly fluid, not fat; our page on salt and water weight explains the difference. Your taste buds adjust within a few weeks, and food with less salt soon tastes normal.
Food that lowers blood pressure and helps you lose weight
The best eating pattern for lower blood pressure is also a good pattern for weight loss: lots of vegetables, fruit, beans and whole grains, some low-fat milk and yoghurt, and less processed meat, salty snacks and sugar. This is the idea behind DASH-style eating.
Vegetables, fruit and beans hold a lot of water and fibre, so a full plate has fewer calories. They also bring potassium, which helps the body get rid of salt. If you have kidney disease, your team may limit potassium, so follow their advice.
We do not repeat the DASH diet itself here; our comparison of diets explains what DASH is and how it compares for weight loss. The practical plate looks like this:
- Half the plate vegetables or salad, fresh or frozen, without salty sauces.
- A quarter lean protein: beans, lentils, fish, chicken, eggs or tofu, which keep you full for longer.
- A quarter whole grains or potatoes, in a portion that fits your plan.
- Fruit or plain yoghurt as a dessert or snack instead of salty or sweet packaged snacks.
Salty swaps with fewer calories
Many salty foods are also high in calories, so one swap can help your blood pressure and your weight at once. The calories below are approximate values per 100 g from the USDA food database.
| Salty food | About kcal | Lower-salt swap | About kcal | Why it helps weight loss |
|---|---|---|---|---|
| Bacon (raw) | 393 | Roast chicken breast | 165 | Less than half the calories and more protein to keep you full |
| Dry salami | 378 | Home-cooked lentils | 116 | About a third of the calories, with fibre and protein |
| Feta cheese | 265 | Plain low-fat yoghurt as a dip or sauce | 63 | About a quarter of the calories |
| Dill pickles | 12 | Fresh cucumber | 15 | Same low calories, but far less salt |
| Salted roasted peanuts | 587 | Unsalted roasted peanuts | 587 | Less salt, not fewer calories: keep to a small handful |
The last two rows show something useful. Taking the salt away does not change the calories, and a low-calorie food can still be very salty. For both goals you need both checks: the salt on the label and the size of the portion.
To find a daily calorie target that suits your weight loss, use our calorie deficit calculator, and talk to your doctor first if you take medicines.
Alcohol, sleep and blood pressure
Drinking less alcohol lowers blood pressure in people who drink more than two drinks a day. In people who drink less than that, cutting down made little difference to blood pressure in the trials.
Roerecke and colleagues pooled 36 trials. The largest drop, about 5.5/4.0 mmHg, was seen when people who usually had six or more drinks a day halved their intake. Not drinking at all is a completely normal choice, and alcohol also adds calories that slow weight loss.
If you drink, it helps to know what guidelines count as lower risk; see how much alcohol is lower risk. Never use alcohol as a way to relax before a reading, and ask your doctor whether alcohol mixes with your tablets.
Sleep matters as well. In a review of cohort studies with millions of people, short sleepers were about 17 % more likely to develop high blood pressure. This shows a link, not proof of cause, but a regular bedtime is a cheap habit that also makes hunger easier to manage.
Loud snoring with breathing pauses, waking up gasping or heavy daytime sleepiness can point to sleep apnoea, which pushes blood pressure up. Mention these signs to your doctor; treatment and weight loss can both help.
Walking and strength with high blood pressure
Walking is one of the safest and most effective ways to lower blood pressure while you lose weight. In the Cochrane review by Lee and colleagues, walking programmes lasted 15 weeks on average, with about 153 minutes a week at a moderate pace, and lowered the top number by about 4 mmHg.
Moderate means you breathe faster but can still talk in full sentences. You do not need to walk fast or far to start; a few brief walks spread over the day count too. Our 12-week walking plan for beginners builds up step by step from 5 to 10 minutes.
Exercise that keeps your heart working for longer, such as brisk walking, cycling or swimming, gave the largest drops in people who already had high blood pressure in the review by Cornelissen and colleagues. Light strength exercises can be added once walking feels easy.
The same review found that holding a grip or a position without moving (isometric exercise) also lowered pressure, but only five small groups were studied. Try isometric holds only after your doctor agrees.
- Breathe out on the effort and never hold your breath while lifting or pushing.
- Warm up and cool down slowly, and stand up slowly after exercises on the floor or on a chair.
- Avoid very hot rooms and drink water during longer walks.
- Stop and rest if you feel chest pain, a severe headache, dizziness or unusual breathlessness.
Our strength training guide has a section on blood pressure and safe strength training, and you can start the Start-level exercise videos at your own pace.
A 12-week plan: weight, salt, walking and home readings
Talk to your doctor first, then use this plan as a guide, not a rule. It combines the four steps that lower blood pressure, one small change at a time.
| Week | Food | Salt | Walking | Readings and check |
|---|---|---|---|---|
| 1 to 2 | Half your plate vegetables at dinner | Swap one salty food you eat often | Two walks of 10 to 15 minutes a day, easy pace | Measure your arm, check your cuff, one week of home readings at the same times each day |
| 3 to 4 | Protein at every meal; water instead of sugary drinks | Compare labels on bread and sauces | Add a few minutes to each walk | Weigh yourself once a week, same day and time |
| 5 to 6 | Fruit or plain yoghurt as your snack | Cook three dinners from scratch | Some brisk minutes in the middle of each walk | Note any dizziness and tell your doctor |
| 7 to 8 | Beans or lentils twice a week | Half the stock cube, sauce on the side | About 20 to 25 minutes most days | Second week of home readings; compare the averages |
| 9 to 10 | Plan takeaways and meals out | Taste before adding salt at the table | Add light strength exercises twice a week | Check sleep: regular bedtime most nights |
| 11 to 12 | Keep what worked; adjust portions | Keep the swaps that you enjoy | About 150 minutes a week in total | Third week of readings; bring your log and weight to your doctor |
A steady loss of around half a kilo a week is enough. After 12 weeks, the important question is not how fast you lost weight, but which habits you can keep for the next year.
If your readings fall during the plan, that is good news to share with your doctor, not a reason to change your tablets yourself.
When to get help now
Very high blood pressure with symptoms is an emergency. A review by Balahura and colleagues describes a hypertensive emergency as usually a top number above 180 and/or a bottom number above 120, together with signs that organs such as the brain, heart or kidneys are being harmed.
Emergency: if a very high reading comes with chest pain, severe breathlessness, a sudden severe headache, confusion, a fit, weakness or numbness on one side of the body, trouble speaking or sudden problems with your vision, call your emergency number straight away. Do not wait to see if it settles, and do not drive yourself.
A very high reading without symptoms is not usually an emergency, but it does need medical advice the same day. Rest for 5 minutes and measure again with the right cuff; if it is still very high, contact your doctor or an out-of-hours service.
High readings in pregnancy always need prompt advice from your midwife or doctor. Our page on obesity and pregnancy explains what extra checks may be offered.
For a regular review, bring your home log, your current weight and a list of all the tablets you take. Ask your doctor what target suits you and when your treatment should next be checked.
Free help to lose weight with good food and walking
At Obesity Foundation we help people lose weight and get healthier with good food, suitable exercise and walking. Lower blood pressure is one of the clearest rewards, and all our help is free.
- Your own eating plan with filling, lower-salt meals and protein with each meal. Ask for your free eating plan.
- Exercise videos at the Start, Build and Strong levels, with calm sessions for beginners. Get the free workout videos.
- A free video meeting (in English) to talk through your first steps and questions for your doctor. Book a free video meeting.
- A Club account to log your walks, weight and progress at no cost. Join the Obesity Foundation Club.
Once your doctor agrees, your first step can be today: measure your upper arm, check that your cuff fits, and plan two short walks for tomorrow.
Frequently asked questions
How much does losing weight lower blood pressure?
On average about 1 mmHg off both the top and the bottom number for every kilo lost. In a review of 25 trials, losing about 5 kg lowered readings by about 4.4/3.6 mmHg, and groups that lost more than 5 kg saw larger drops. Your own result can be bigger or smaller.
Can I stop my blood pressure tablets once I lose weight?
Not on your own. Weight loss can lower blood pressure enough for a doctor to reduce or sometimes stop a medicine, but that decision needs your doctor, your home readings and regular checks. Stopping suddenly can make blood pressure rise again quickly.
Can a cuff that is too small give a wrong reading?
Yes. In a randomised trial, a regular cuff read the top number about 5 mmHg too high in people who needed a large cuff and almost 20 mmHg too high in people who needed an extra-large one. Measure around the middle of your upper arm and choose the cuff by that size.
Which exercise helps blood pressure most when I am heavy?
Walking and other steady exercise such as cycling or swimming are the safest place to start. Walking about 150 minutes a week lowered the top number by about 4 mmHg in a large review. Add light strength exercises later, breathe out on the effort and never hold your breath.
How much salt can I have when I have high blood pressure?
Many experts suggest no more than 5 to 6 g of salt a day, about a teaspoon in total, and less is better in the long run. Most of it is already in bread, sauces, processed meat and takeaways, so reading labels and cooking at home help most. Ask your doctor for your personal limit.
Why do I feel dizzy when I stand up now that I am losing weight?
As your weight falls, your blood pressure may fall too, so a dose that used to be right can become too strong. Sit down, drink some water and stand up slowly. Tell your doctor soon, because they may need to review your tablets; do not skip or change them yourself.
Sources
- 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)
- Semlitsch T, Krenn C, Jeitler K et al. – Long-term effects of weight-reducing diets in people with hypertension, Cochrane Database Syst Rev (2021)
- Stevens VJ, Obarzanek E, Cook NR et al. – Long-term weight loss and changes in blood pressure: results of the Trials of Hypertension Prevention, phase II, Ann Intern Med (2001)
- Whelton PK, Appel LJ, Espeland MA et al. – Sodium reduction and weight loss in the treatment of hypertension in older persons (TONE), JAMA (1998)
- He FJ, Li J, MacGregor GA – Effect of longer-term modest salt reduction on blood pressure, Cochrane Database Syst Rev (2013)
- Lee LL, Mulvaney CA, Wong YKY et al. – Walking for hypertension, Cochrane Database Syst Rev (2021)
- Cornelissen VA, Smart NA – Exercise training for blood pressure: a systematic review and meta-analysis, J Am Heart Assoc (2013)
- Ishigami J, Charleston J, Miller ER et al. – Effects of cuff size on the accuracy of blood pressure readings: the Cuff(SZ) randomized crossover trial, JAMA Intern Med (2023)
- Muntner P, Shimbo D, Carey RM et al. – Measurement of blood pressure in humans: a scientific statement from the American Heart Association, Hypertension (2019)
- Hall JE, do Carmo JM, da Silva AA et al. – Obesity-induced hypertension: interaction of neurohumoral and renal mechanisms, Circ Res (2015)
- 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)
- Itani O, Jike M, Watanabe N, Kaneita Y – Short sleep duration and health outcomes: a systematic review, meta-analysis, and meta-regression, Sleep Med (2017)
- Balahura AM, Moroi ȘI, Scafa-Udrişte A et al. – The management of hypertensive emergencies: is there a “magical” prescription for all?, J Clin Med (2022)
- U.S. Department of Agriculture, Agricultural Research Service – USDA National Nutrient Database for Standard Reference, Legacy Release (2018)