Salt Questions · Health & nutrition
How does salt affect blood pressure?
Short answer
Eating more sodium makes the body hold more water, increasing the volume of blood the heart has to pump, and it can stiffen blood vessels over time. Both raise blood pressure. People differ in how sensitive they are, but trials show that cutting sodium lowers blood pressure, especially in people who already have high blood pressure.
How sodium raises blood pressure
- 1More sodium in the blood
- 2Body holds water to dilute it
- 3Blood volume increases
- 4Higher pressure on artery walls
How it works
- Extra sodium draws water into the bloodstream to keep sodium levels balanced.
- More blood volume means more pressure on artery walls.
- Over time, high sodium can also affect blood vessel lining and stiffness, keeping pressure up.
Salt sensitivity
Some people's blood pressure rises much more with salt than others'. Salt sensitivity is more common with age, in people with high blood pressure, kidney disease or diabetes, and in some populations.
What the evidence shows
Controlled feeding studies such as DASH-Sodium found that each step down in sodium lowered blood pressure, and the effect was larger when combined with a diet rich in fruit, vegetables and low-fat dairy. WHO and the AHA both list cutting sodium among the most effective ways to lower blood pressure across a population.
Related on The Salt Almanac
More health & nutrition questions
- Is pink Himalayan salt actually healthier than white salt?
- What are the best low-sodium salt substitutes?
- Why do athletes need to consume more salt?
- Does sea salt have less sodium than table salt?
- What is the difference between sodium and salt?
- Can eating too little salt be dangerous for your heart?
Cite this page
For school projects and reports. Teachers often prefer the original sources too: see the list below.
The Salt Almanac. (2026, November 8). How does salt affect blood pressure. https://saltalmanac.com/answers/how-does-salt-affect-blood-pressure
“How does salt affect blood pressure.” The Salt Almanac, 8 Nov. 2026, saltalmanac.com/answers/how-does-salt-affect-blood-pressure. Accessed [today's date].
“How does salt affect blood pressure.” The Salt Almanac. Last modified November 8, 2026. https://saltalmanac.com/answers/how-does-salt-affect-blood-pressure.
Original sources
- American Heart Association. How much sodium should I eat per day? https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/sodium/how-much-sodium-should-i-eat-per-day
- World Health Organization. Sodium reduction (fact sheet). https://www.who.int/news-room/fact-sheets/detail/sodium-reduction
- Amer M, et al. Effects of dietary sodium and the DASH diet on the occurrence of headaches. BMJ Open, 2014. https://pubmed.ncbi.nlm.nih.gov/25500372/