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It can, by a few points for most people, and mainly through the weight that comes off. In 2025 the BMJ pooled 99 trials of fasting diets. Fasting improved blood pressure, sugar and cholesterol about as much as eating a little less every day. A few small trials found bigger falls when people stopped eating by mid-afternoon. Those were short studies, though, and nobody has yet shown the same in a large group over a year. In practice, a 10-hour eating window that ends by 7 or 8 pm is a fair place to begin.
Before you start, take a week of home readings to know where you stand. Sit quietly first and take two readings each morning before tea. Repeat after four weeks of fasting and compare the averages. If you are already treated for high blood pressure, talk to your doctor first, since readings can drop faster than expected.
Does intermittent fasting lower blood pressure?
On average it does, by a small amount, and mostly because people lose weight. Semnani-Azad and colleagues pooled 99 randomised trials with 6,582 adults for the BMJ in 2025. Every kind of intermittent fasting they looked at, from alternate-day fasting to time-restricted eating, took weight off compared with eating freely. Against plain daily calorie cutting, fasting came out about even on blood pressure, sugar and cholesterol.
An umbrella review led by Sun in 2024 found something similar, with one twist. In adults with overweight or obesity, fasting lowered systolic pressure a little less than steady calorie restriction did. The difference was small, but it is a useful corrective to the idea that skipping meals has a special effect on the arteries.
So think of fasting as one way of eating less. For people who find it easier than counting portions at every meal, it works well. For people who end the fast by eating twice as much, it does very little for weight or for pressure.
How much does blood pressure fall with fasting?
In most trials, a few points. In a handful of small ones, quite a lot more. The numbers depend on who was studied, how long the eating window was and how much weight came off.
The largest fall came from a tiny study. Sutton and colleagues at the Pennington centre in Louisiana gave eight men with prediabetes all their food within six hours, with dinner finished before 3 pm. They were fed enough to keep their weight steady. After five weeks, morning blood pressure was 11 points lower systolic and 10 points lower diastolic than on a normal 12-hour schedule.
Larger trials found smaller changes. Jamshed's team in Alabama gave 90 adults with obesity an eating window of 7 am to 3 pm, along with a calorie target. After 14 weeks, diastolic pressure was about 4 points lower than in a group eating over 12 hours or more.
Wilkinson and colleagues in San Diego asked 19 adults with metabolic syndrome to eat within a 10-hour window for 12 weeks. A large share of them were already on treatment for blood pressure or cholesterol. Systolic pressure fell by about 5 points and diastolic by about 6.5, although the study had no comparison group.
Is it the fasting or the weight loss that lowers blood pressure?
Mostly the weight loss. Neter and colleagues pooled 25 trials of weight reduction back in 2003, long before fasting apps. Blood pressure fell by about a point, systolic and diastolic, for each kilo people lost. Those who lost more than 5 kg saw falls of roughly 6.6 and 5.1.
Liu's trial in Guangzhou is the cleanest test of fasting on its own. All 139 adults with obesity got the same calorie target for a year, and half of them also ate only between 8 am and 4 pm. At twelve months both groups had lost similar weight, and their blood pressure had moved by similar amounts. The clock added nothing measurable once the calories were matched.
The one hint that timing matters comes from Sutton's eight men, whose pressure fell while their weight stayed put. Our body clocks do seem to handle food better earlier in the day. Nobody has yet shown that this adds up to much in a large group over many months.
What this means at home is reassuring. You do not need a perfect fasting schedule. If skipping the late-night snack and closing the kitchen at 8 pm helps you eat less, your readings will very likely follow the scale down.
Which intermittent fasting is best for blood pressure?
An early eating window has the best record so far. The two trials with the clearest falls in pressure, Sutton's and Jamshed's, both stopped food in the mid-afternoon. A 10-hour window, as in Wilkinson's study, also helped and is easier to live with.
Few Indian households eat dinner at 3 pm, and you do not need to. A realistic start is a 12-hour window, say 8 am to 8 pm, with nothing after dinner except water. After two weeks, try pulling dinner to 7 pm and breakfast to 9 am, which gives a 10-hour window. If your day allows a big lunch and a light early dinner, so much the better.
Alternate-day fasting led the BMJ network analysis for weight loss, by a little over a kilo, but it is hard to keep up and most people drop it. The 5:2 pattern, with two low-calorie days a week, sits in between.
Whatever you choose, keep the meals inside the window sensible. A late fast broken with pakoras, sweet chai and a heavy biryani undoes much of the benefit. Dal, sabzi, curd, fruit and a source of protein at each meal keep salt and calories in check.
What do studies of Ramadan fasting show about blood pressure?
Ramadan is the biggest fasting study nobody has to organise. Every year a whole community fasts from dawn to sunset for a month, which lets researchers measure the same people at the start of the month and again at the end. Al-Jafar and colleagues did exactly that with 85 volunteers in London. Then they pooled 33 earlier studies covering 3,213 participants.
By the end of the month, systolic pressure was about 3 points lower and diastolic about 2 points lower. That held in healthy volunteers and in those with high blood pressure or diabetes. It did not hold in chronic kidney disease. The team checked whether the fall simply reflected lost weight or lost water, and it did not.
The pattern is different from a fasting diet. There is no water in daylight, meals shift to before dawn and after sunset, and iftar often means fried and sweet food. The finding is still useful. A month of strict daily fasting did not raise blood pressure on average, even in people who started with high readings. If you fast for religious reasons and are treated for blood pressure, ask your doctor before Ramadan how to time treatment around sehri and iftar.
Sources: [8]
How should you measure blood pressure while fasting?
Get an automatic cuff that goes on the upper arm. Wrist cuffs are easy to wear but give more erratic numbers. Before each reading, sit for five minutes with your back against the chair, feet on the floor and your arm resting on a table at heart height. Do not talk. Take two readings a minute apart and write both down.
Measure at the same time every day, ideally soon after waking, after the toilet and before tea or coffee. Do this for a week before you change how you eat, so you know your starting point. After that, compare one week's average with the next. A single reading taken after rushing up the stairs, or in the middle of an argument, can run 15 points higher than a calm one.
Plenty of people skip this, and plenty have no idea their pressure is high. The WHO estimates that 1.4 billion adults aged 30–79 live with hypertension and that about 44% of them do not know. In India the ICMR-INDIAB survey found it in 35.5% of adults.
The WHO counts 140/90 or above as high blood pressure. If your weekly average sits there, book a doctor's visit whether you start fasting or not.
Is intermittent fasting safe if you are treated for high blood pressure?
Usually, with your doctor's agreement and some care in the first weeks. Wilkinson's study showed people already on treatment for blood pressure and cholesterol could fast within a 10-hour window and improve their readings.
The risk is going too low. Fasting, weight loss and less salt can all bring pressure down, and treatment chosen for your old readings may then be too strong. Watch for light-headedness when you stand up, unusual tiredness or readings below about 100 systolic. If any of these happen, tell your doctor rather than stopping treatment on your own.
Ask your doctor whether your treatment should be taken with food, and fit it inside your eating window if so. Keep drinking water through the fasting hours, especially in summer, since dehydration can make dizziness worse.
People with kidney disease, heart failure, type 1 diabetes or a history of eating disorders, and anyone pregnant, should not start fasting without specific medical advice.
Sources: [5]
What else should go with fasting to bring blood pressure down?
Start with salt, because Indian kitchens hide a lot of it. Pickle, papad, namkeen, packet masalas and restaurant gravies add up long before anyone reaches for the salt shaker. Filippou's meta-analysis of 30 trials found that the DASH diet, built on vegetables, fruit, pulses and low-fat dairy, lowered pressure by about 3 points systolic and 2.5 diastolic. It worked best in people who ate the most salt to begin with.
At home that looks like a smaller spoon of pickle, or none on weekdays. Roasted chana instead of namkeen with evening tea. Asking for less salt in the dal, and tasting before adding more at the table. Buttermilk without the extra kala namak.
Then add movement. A brisk 30–40 minute walk on most days, after dinner if that suits you, helps blood sugar and, over a few months, blood pressure. Sleep counts too, since late nights tend to bring late snacks.
Keep an eye on muscle as well. In the TREAT trial, Lowe's team asked people to eat only between noon and 8 pm for 12 weeks. They lost a little weight, but they also lost lean tissue from their arms and legs. Two or three sessions a week of squats, push-ups against a wall and resistance bands, with dal, paneer, eggs or curd at each meal, help hold on to it.
A doctor can help you fit these pieces together. At Metaboliq that starts with a home blood test and your cuff record, read with you, and a plan that aims to lose up to 20% of body weight while you keep your muscle.