How much salt a day, and does cutting it help?
Under 5 g of salt a day — about a teaspoon, or less than 2 g of sodium[1]. The Eastern Mediterranean Region averages more than 10 g[3], and a properly measured national survey in Oman found 9.0 g[4]. Cutting salt by roughly 4.4 g a day lowered systolic pressure by 5.39 mmHg in people with hypertension and 2.42 mmHg in people without[5]. Almost none of it comes from the salt shaker.
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The ceiling, and what it looks like in a spoon
The World Health Organization's recommendation for adults is less than 2 g of sodium a day, which is less than 5 g of salt — roughly one level teaspoon[1]. Two things about that sentence trip people up. The first is that sodium and salt are different numbers for the same thing: table salt is about 40% sodium by weight, so a label reporting sodium is reporting a smaller figure than the salt it came from. The second is that the teaspoon is the total for the whole day, from every source, and most of it will never pass through your salt shaker.
WHO also sets a lower ceiling for children, scaled down from the adult figure by energy needs[1].
How much we actually eat
Global mean sodium intake was estimated at 4,278 mg a day in 2021 — about 11 g of salt, more than twice the recommendation — and excess sodium was associated with an estimated 1.7 million deaths in 2023[2]. The Eastern Mediterranean Region, which includes Egypt and the Gulf, averages more than 10 g of salt a person a day[3].
Where a country has measured it properly the picture is consistent. A national survey in Oman using 24-hour urine collection — the only method that does not depend on people remembering what they ate — found a mean of 9.0 g of salt a day, with fewer than one in four adults inside the guideline[4]. The gap is not a rounding error. It is roughly double.
What cutting it does to blood pressure
This is the part with the strongest evidence. Pooling 34 randomised trials lasting four weeks or more, a reduction of about 4.4 g of salt a day lowered systolic blood pressure by 5.39 mmHg and diastolic by 2.82 mmHg in people with hypertension, and by 2.42 mmHg and 1.00 mmHg in people without[5].
A controlled feeding trial makes the same point from the other direction: lowering sodium within a typical diet reduced blood pressure at every level tested, and doing it on top of a diet rich in vegetables, fruit and low-fat dairy lowered it further still[6]. Salt reduction is not an alternative to the rest of the diet; it stacks with it.
If you do not have hypertension, the effect on your reading today is modest. The reason to care is that blood pressure climbs with age, and the intake that drives it is a habit built over decades.
Where the salt actually is
Almost never the shaker. WHO names breads, processed meats, snack foods, condiments such as soy and fish sauce, commercial sauces and dressings, and instant products as the main contributors[2]. Translated into a local kitchen, the list that matters is bread, white and processed cheeses, olives and pickles, cured and processed meats, stock cubes and ready spice or seasoning mixes, instant noodles and soups, salted nuts and crisps, and the sauces that come with takeaway.
Bread deserves its own mention because it is rarely salty to the taste and is eaten in quantity at every meal. It is the single largest sodium source in many diets not because it is concentrated but because the portions are.
Salt, water and the scale
A salty dinner shows up on the scale the next morning. That is water, held alongside the sodium, and it leaves again within a day or two — which is why cutting salt produces a fast, satisfying drop that stops as suddenly as it started. None of that movement is body fat, in either direction. Salt is a blood pressure question, and treating it as a weight-loss lever leads to disappointment on a two-week view. For what a real rate of change looks like, see how fast you can safely lose weight.
What to change, and who should be stricter
Three changes do most of the work, and none of them involves bland food. Replace part of the salt with acid and aromatics — lemon, vinegar, garlic, onion, cumin, coriander, black pepper — because what most dishes are missing without salt is sharpness, not sodium. Read the sodium line on packaged foods and compare two brands of the same product rather than trying to hit a daily figure. And taste before salting, which sounds trivial and removes a reflex.
Some people need to be stricter and should be guided by a clinician rather than by a general ceiling: anyone with hypertension, chronic kidney disease, heart failure, or on medication whose dose interacts with sodium and potassium. Potassium-based salt substitutes lower sodium intake usefully for many people[2], but they are not safe for everyone with kidney disease, so that swap in particular is a conversation with your doctor, not a purchase decision.
Sources
- World Health Organization. Guideline: Sodium Intake for Adults and Children. Geneva: WHO, 2012. ↩
- World Health Organization. Sodium reduction — fact sheet. ↩
- WHO Regional Office for the Eastern Mediterranean. Reducing salt/sodium consumption to prevent and control noncommunicable diseases in the Eastern Mediterranean Region — questions and answers. ↩
- Al-Mawali A, D'Elia L, Jayapal SK, et al. National survey to estimate sodium and potassium intake and knowledge, attitudes and behaviours towards salt consumption of adults in the Sultanate of Oman. BMJ Open 2020;10(10):e037012. ↩
- He FJ, Li J, MacGregor GA. Effect of longer-term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials. BMJ 2013;346:f1325. ↩
- Sacks FM, Svetkey LP, Vollmer WM, et al. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. New England Journal of Medicine 2001;344(1):3–10. ↩