How much salt is hidden in your food?
Most salt does not come from your salt shaker but from bread, cheese and ready-made food. Take the source check and see where your gains are.
🩺 Written by K.Y.J.A.M. Ho, MD PhD, medical specialist · reviewed by C. Pleiter, medical specialist · updated 27 August 2026 · sources & method · how we make this
Take the source check (1 min) ↓
Where your salt probably comes from
Educational indication based on averages, not a personal measurement or medical advice. Percentages and effects are population averages.
This check gives an indication only. It is not a medical test and makes no diagnosis. Discuss any doubt or symptoms with your doctor.
Want to tackle your biggest sources? We will send you the salt swap list: per product group the saltiest choices and their better swap, plus the label rule that lets you compare in two seconds.
Strong Direct, consistent randomised trials or meta-analyses matching the population and intervention Moderate Randomised evidence with heterogeneity, indirectness or limited applicability Limited Small, short or observational studies; insufficient independent confirmation
Why your salt shaker is not the culprit
When people think of too much salt, they think of sprinkling. But self-added salt (cooking plus table) is only some 10 to 15 percent of intake; the vast majority is already inside manufactured products. The treacherous part: the biggest sources do not even taste distinctly salty. One slice of bread seems harmless, but six slices a day make bread a main source. If you want to help your blood pressure, you gain more from more vegetables and potassium and fewer processed products than from banishing the salt shaker.
| Product group | Why it adds up | Smart swap |
|---|---|---|
| Bread | Low per slice, but high through the number of slices per day | Lower-salt bread; fewer slices; watch the toppings |
| Cheese and cold cuts | Salt acts as preservative and flavouring there | Younger cheese, egg, hummus, unsalted nut butter |
| Ready meals, pizza, delivery | One meal can approach the daily maximum | Cook yourself, even simply; frozen vegetables are fine |
| Soup, sauce, stock | Liquid salt: one cup of soup counts substantially | Fresh or low-salt version; herbs, lemon, vinegar |
| Savoury snacks | Salt plus volume: easy to eat a lot of | Unsalted nuts; vegetables with a dip |
What does it deliver?
With elevated blood pressure, sustained moderate salt reduction gives an average of just over 5 mmHg less systolic pressure (indicatively 4 to 6); without elevated blood pressure it is 2 to 3. The effect grows with the size of the reduction and with your salt sensitivity, which increases with age and weight. And it does not simply stack with other measures: those who eat better automatically take in less salt.
The science, in full
For each claim, the strength of the evidence and the source. Note the population and what was measured behind every number.
Salt reduction lowers blood pressure Strong
The Cochrane analysis by He and MacGregor found that sustained moderate salt reduction gives an average systolic reduction of just over 5 mmHg in hypertension and 2 to 3 mmHg without hypertension [1]. A dose-response analysis across experimental studies shows the reduction grows with the size of the sodium reduction, including within common intakes [2]. Dutch guidance uses a maximum of 6 grams of salt per day, the WHO less than 5 grams [3,4].
Most salt is hidden Moderate
Classic source research attributed only some 10 to 15 percent of intake to self-added salt (cooking plus table); the vast majority, on the order of three quarters, was already in processed products [5]. That research is American and dated, but national food consumption surveys point the same way: bread, (processed) meat, cheese, sauces and soups together supply the majority [6].
Potassium-based salt substitutes: fewer strokes and deaths Strong
In the SSaSS trial (nearly 21,000 participants with a history of stroke or poorly controlled blood pressure), salt in which a quarter of the sodium was replaced by potassium gave 14 percent fewer strokes and also lower mortality [7]. Caveat: the population was selected and mostly ate home-prepared food; with kidney disease or potassium-sparing medication, consult your doctor first [10].
Less salt, fewer cardiovascular events over time Moderate
Observational follow-up of the TOHP trials showed fewer cardiovascular events after earlier salt reduction [8], and the systematic review by Aburto supports the chain from lower intake to lower blood pressure to lower risk [9]. Direct randomised endpoint evidence beyond SSaSS remains limited.
The scientific debate, stated honestly Limited
Cochrane analyses by Graudal show that very strict short-term sodium restriction can also raise renin, aldosterone and lipids; the clinical meaning of that is contested [11]. Observational cohorts (PURE) suggested a J-shaped association in which very low intake also correlated with risk, but the measurement method (a single urine sample) and reverse causality are widely criticised [12,13]. The guidelines stand: moderate your intake towards 5 to 6 grams; extreme restriction is not the goal [3,4].
What the Dutch GP guideline says Moderate
The NHG Standard on cardiovascular risk management, the guideline Dutch general practitioners work by, does not name a number of grams itself; for diet it refers to the Wheel of Five of the Netherlands Nutrition Centre, which carries the Health Council advice of no more than 6 grams of salt a day for adults [3,14]. We do not depart from that. What we add is where the salt comes from, because the guideline does not work that out and the difference between the salt shaker and the shopping trolley decides whether someone gets there. On the points the guideline does make hard we follow it without exception: a blood pressure that stays high on repeated measurement belongs with the doctor, and nobody changes their medication on their own. With repeatedly measured values at or above 180 mmHg systolic or 120 mmHg diastolic: get assessed medically without delay; contact a doctor immediately in case of chest pain, breathlessness, sudden neurological loss, confusion, severe headache, loss of vision or other serious symptoms. Discuss this with your own doctor.
Frequently asked questions
How much salt can I have per day?
Most guidelines advise at most 5 to 6 grams of salt per day (about one level teaspoon); the World Health Organization says less than 5 grams. Most people are well above that, mainly through processed products.
Is sea salt or Himalayan salt healthier than regular salt?
No. The active part is sodium, and the amount is virtually the same. Prettier colours and crystals change nothing; only less sodium helps your blood pressure.
Are potassium-based salt substitutes a good idea?
Often, yes: in a large randomised trial, salt in which part of the sodium was replaced by potassium led to fewer strokes and deaths. But talk to your doctor first if you have kidney disease or use medication that retains potassium.
How soon will I notice anything from eating less salt?
With elevated blood pressure, often within two to four weeks; measure at home following a protocol during that period. Your taste adapts too: after a few weeks, salty food tastes sharper again.
Does drinking lots of water flush out salt?
No. Your kidneys regulate the salt balance; extra water does not change your sodium intake. The only route is taking in less salt, mainly from processed products.
Read next
Want to work on this with a doctor at your side?
The DrHealthy programme is 12 weeks of personal lifestyle coaching for people who want to improve their blood pressure, weight or blood sugar. Concretely: an extensive intake questionnaire and your personal plan in week 1, then weekly adjustments to your lifestyle guided by a physician and daily structure via WhatsApp; you track your lifestyle measurements, such as weight, waist circumference, sleep and energy, and we use those to choose your next step. Blood pressure and blood test results belong with your own doctor and fall outside the programme. Introductory price 499 euros including VAT; the programme does not treat acute or serious conditions and does not replace your own doctor. Coaching is currently offered in Dutch and English.
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