Because keto improves so many heart-related markers, people often assume it must lower blood pressure too. It is a reasonable expectation, and it is worth answering honestly rather than just agreeing, because the research here is more sobering than the rest of keto’s cardiovascular story. The short version: keto does not reliably lower blood pressure by itself, but the weight loss it brings often does the job indirectly.
What the meta-analysis found
A GRADE-assessed systematic review and meta-analysis pooled 23 randomised controlled trials covering 1,664 people and looked specifically at what ketogenic diets do to blood pressure. The result was essentially neutral: no statistically significant change in either systolic or diastolic blood pressure compared with control diets. The numbers hovered around zero. So on the direct question, does eating keto lower your blood pressure, the best available evidence says not meaningfully, at least not as a direct effect of the diet itself.
Why the weight loss still matters
That is not the whole story, though, and this is where it becomes useful rather than disappointing. Carrying excess weight is one of the biggest drivers of high blood pressure, and losing weight is one of the most effective non-drug ways to bring it down. Keto reliably produces weight loss, so a person who is overweight and goes keto may well see their blood pressure improve, not because of the ketosis but because of the pounds lost. The route is indirect, but the destination can still be lower blood pressure for many people.
The salt wrinkle
There is a detail worth knowing, because it confuses people. Keto changes how the body handles sodium, and in the early weeks it makes you excrete more salt and water, which is why electrolyte advice on keto often tells you to add salt rather than cut it. For most people that is fine and helps avoid the keto flu. But if you have high blood pressure and have been advised to watch your salt intake, this is a point to raise with your doctor rather than just piling salt on, because the right balance depends on your situation. It is not a reason to avoid keto, just a reason to coordinate.
What it means in practice
If you have high blood pressure, do not adopt keto expecting the diet itself to fix it; expect that any improvement will come mainly through weight loss, if you have weight to lose. Keep monitoring your blood pressure, ideally at home, so you can see what is actually happening for you rather than relying on an average. And here is the important safety point: if you take blood-pressure medication and you lose a significant amount of weight, your blood pressure can fall enough that the medication needs reducing, which is a conversation to have with your doctor, not a change to make alone. Falling blood pressure is good news, but the medication has to keep pace with it.
Keeping it in proportion
None of this makes keto bad for your heart. As the piece on keto and heart risk factors covers, it tends to improve triglycerides, HDL and weight, which are all good for cardiovascular health. Blood pressure is simply the one cardiovascular marker it does not move directly, and pretending otherwise would be the kind of overclaiming that this whole subject suffers from. Honest is more useful: keto helps your blood pressure mainly by helping you lose weight.
The bottom line
The best meta-analysis found that a ketogenic diet has little direct effect on blood pressure, so it is not a blood-pressure treatment in its own right. What it can do is drive weight loss, and that often lowers blood pressure for people who are overweight. Watch your salt sensibly, monitor your readings, and if you are on medication, keep your doctor in the loop as the weight, and possibly the blood pressure, comes down.
This is general information about the ketogenic diet, not medical advice. High blood pressure is a serious condition; do not stop or change blood-pressure medication without your doctor. If you are pregnant, on medication, or managing a health condition, speak to a professional before changing your diet.
Source: Effect of ketogenic diet on blood pressure: A GRADE-assessed systematic review and meta-analysis of randomized controlled trials. Nutrition, Metabolism and Cardiovascular Diseases. 2024. Read it here.