Seasoning without salt: what actually works with herbs, spices and citrus

Adults in Switzerland eat an average of 8.7 g of salt a day, roughly 75 % above the 5 g the WHO recommends, according to the Swiss salt study 2022/23 run by the Federal Food Safety and Veterinary Office. Yet more than nine in ten of the people surveyed say they never or only occasionally add salt at the table. Those two numbers do not contradict each other. Most of the salt is already in the food before it reaches the kitchen, and that single fact changes the whole strategy.

So this article covers where your salt actually comes from, what cutting it measurably changes, the five flavour levers that stand in for salt with evidence behind them, the Swiss iodine trap that almost nobody mentions, and a gradual method that survives past the first fortnight.

The numbers that matter

  • WHO recommendation: under 5 g of salt a day for an adult, meaning under 2000 mg of sodium. The NHS sets a maximum of 6 g. Useful conversion: 1 g of salt equals 400 mg of sodium.
  • Swiss average: 8.7 g a day. 7.4 g for women, 9.9 g for men, peaking at 10.9 g among men aged 45 to 59. Only 14 % of the population stays under 5 g.
  • Around three quarters of the salt eaten in the UK comes from packaged and everyday foods, led by bread and ready meals, according to the NHS.
  • A crossover trial published in Nutrients in 2019 found that a mezze containing half the salt (0.4 % instead of 0.8 %) but seasoned with herbs and spices was liked as much as the standard salted version, across 94 participants and 130 in a follow-up.
  • Potassium matters as much as sodium. Swiss adults excrete an average of 2.7 g a day, against the WHO recommendation of at least 3.5 g.
  • Iodised salt supplies 51 % of iodine intake in Switzerland. Removing it without a replacement creates a real problem, particularly on a vegetarian diet.

Where your salt actually comes from

The salt cellar sits on the table, so it gets the blame. The data suggests it is not the main culprit. The NHS estimates that around 75 % of salt eaten in the UK comes from bread, breakfast cereals, ready meals, processed products and eating out. The Swiss study points the same way from a different angle: over 90 % of people say they do not add salt at the table, and intake still sits at 8.7 g.

One more figure from that study deserves a pause. Only 36 % of participants had a self-assessment of their salt intake that matched what was actually measured in their urine. Two thirds of people are wrong about their own consumption, in one direction or the other. Intuition is a poor measuring instrument here.

The practical consequence: if you already cook a lot at home and salt lightly, learning to season without salt will give you a real but modest gain on your total. The bigger lever is what you buy, especially bread, cheese, jarred sauces, stock cubes and prepared meals. The two approaches work together, and it is precisely because home cooking is a limited share of the total that it is worth aiming for a decisive cut rather than a symbolic one.

For comparing products, the NHS threshold is simple. A food counts as high in salt above 1.5 g per 100 g, and low at 0.3 g or less per 100 g. If the label gives sodium rather than salt, multiply by 2.5. Our guide to reading and understanding a nutrition label covers the other traps in those tables.

What cutting salt actually changes

It helps to separate what is firmly established from what is merely likely.

Established: the WHO links high-sodium diets to raised blood pressure, itself a risk factor for cardiovascular disease, and estimates that 1.7 million deaths a year were associated with excess sodium in 2023. The Swiss data show a positive relationship between salt excreted in urine and blood pressure, with 24 % of adults hypertensive (32 % of men, 15 % of women).

Measured in a controlled trial: the DASH4D trial published in JAMA Internal Medicine in 2025 fed 102 adults with type 2 diabetes four successive five-week diets, providing all their food. The lower-sodium DASH4D diet cut systolic blood pressure by 4.6 mmHg compared with the higher-sodium comparison diet, and that drop came primarily from the sodium reduction. A change of this size is clinically meaningful at population scale, even if it looks modest for one person.

An important nuance: sodium reduction is not the only mechanism. An analysis of the SSaSS trial published in the Journal of Human Hypertension in 2024 broke down the 3.3 mmHg drop seen with a potassium-enriched salt. Across the models fitted, sodium reduction explained only 12 to 39 % of the effect. Most of it came from the increase in potassium. That is modelling rather than direct measurement, but it reframes the advice: eating more vegetables, fruit, pulses, nuts and wholegrains probably counts as much as taking salt out. A well-built vegetarian diet already holds that card.

What is not established: that a strictly no-added-salt kitchen beats a moderately salted one. No solid data show this, and the sensible target remains getting the daily total towards 5 g, not down to zero.

The Swiss iodine trap

This is the blind spot in most articles on the subject, and it lands squarely on vegetarians.

Swiss soils are poor in iodine because of glaciation and erosion. The FSVO notes that iodised salt, in home cooking and above all in processed foods, now provides 51 % of the population’s iodine intake, ahead of dairy (26 %) and fish and seafood (9 %). Bread is the leading practical source in Switzerland, simply because 86 % of bakeries use iodised salt. On the industrial side, 34 % of processed products contain it.

Now run the arithmetic for a vegetarian who cuts salt, buys artisan bread made without iodised salt, eats little or no dairy and no fish: all four main sources vanish at once. The FSVO explicitly advises vegetarians and vegans to choose iodised salt, because many plant drinks contain none.

So the official line is not “cut the salt” but “no more salt, but iodised salt”. Whatever salt you keep should be iodised, in the pan and at the table. Check the ingredient list on processed products, where it has to be declared.

Seaweed is often presented as the plant-based answer. It can deliver a great deal of iodine, sometimes too much. The FSVO warns against overdose, which can show up as weight loss, heart rhythm disturbance, disturbed sleep, tremor or anxiety. Kombu is particularly concentrated. Seaweed has its place once you know the quantities, which our articles on avoiding iodine deficiency without fish and on cooking with dulse, wakame, nori and kombu set out.

The five levers that replace salt

Salt does three things in the mouth: it contributes its own taste, it lifts the perception of aroma, and it masks bitterness. No single ingredient does all three. You have to combine.

1. Acidity

The fastest and most reliable lever. Lemon juice, lime, cider vinegar, wine vinegar, verjuice, tomato, tart yoghurt. Acidity grabs the palate’s attention immediately and compensates for the flatness of an under-salted dish. It also lightens the perception of fat.

Starting dose: one tablespoon of lemon juice for four portions of soup or roast vegetables, added off the heat. Juice loses its edge when cooked, whereas zest holds up better because its aromatic compounds sit in the essential oil of the flavedo, the coloured part of the peel. Take the zest without the white pith, which is bitter.

2. Umami

The glutamate and nucleotides in certain foods create a roundness and depth that partly compensates for missing salt. Concentrated plant sources: dried shiitake, sun-dried tomato, tomato purée, miso, soy sauce, nutritional yeast, long-caramelised onion, roasted mushrooms.

Watch the shortcut, though. Miso and soy sauce bring umami but also a great deal of salt. A teaspoon of miso beats a pinch of salt because it delivers more flavour for comparable sodium, not because it is sodium-free. Dried shiitake, tomato purée and nutritional yeast deliver the umami without the sodium. Our guides to boosting umami without meat and to homemade umami-rich broths give workable proportions.

3. Aroma

The least known lever and one of the most interesting. Several recent food chemistry papers describe an effect called odour-induced saltiness enhancement: certain volatile compounds make a food taste saltier than it is, without adding sodium. A study in Food Chemistry in 2026 identified compounds in soy sauce, including 2,3,5-trimethylpyrazine and methionol, that significantly increased perceived saltiness in a 0.6 % salt solution. Work on blanched celery juice reports perceived saltiness rising by 39 to 101 % depending on the compound.

Two limits worth holding onto. These trials use solutions or simple laboratory matrices, not your frying pan. And the effect is strongest at intermediate salt concentrations rather than at zero. But the practical principle stands: the compounds involved are pyrazines and aldehydes, which is exactly what the Maillard reaction produces. Roasting vegetables to a proper brown, toasting spices, dry-frying nuts and caramelising onions is not decoration. It generates the molecules that make an under-salted dish convincing.

4. Pungency and the trigeminal route

Pepper, chilli, ginger, mustard, horseradish, Sichuan pepper. These sensations bypass the taste receptors and travel through the trigeminal nerve, and they occupy sensory attention. A study in the Journal of Agricultural and Food Chemistry in 2026 showed that a Sichuan pepper extract, with its characteristic numbing effect, increased perceived saltiness and allowed salt to be cut without a loss of perceived intensity. Again, this is a controlled sensory test rather than a validated recipe, but the direction fits what happens at the stove.

5. Texture

This lever goes almost entirely unnoticed. Work published in Food Hydrocolloids showed that the perceived saltiness of the same quantity of salt varies with the viscosity and firmness of the medium: in a firm gel or a very thick preparation, sodium is released more slowly and the dish tastes less salty. In the kitchen that means a very thick velouté or a dense purée needs more salt for the same effect than a fluid one. Lightening the texture, or putting a salty element on the surface rather than through the mass, cuts the total quantity at equal perception. That is exactly why gomasio scattered at the last moment works.

Herbs: what actually counts

The distinction worth knowing is not botanical but thermal.

Woody herbs, thyme, rosemary, savory, bay, oregano, marjoram, carry less volatile aromatic compounds and stand up to long cooking. Add them early. Dried, they stay effective, sometimes more concentrated than fresh.

Tender herbs, parsley, basil, coriander, chives, mint, dill, chervil, tarragon, carry highly volatile compounds that degrade with heat. Add them off the heat, at the last moment. Dried, they lose most of their point: dried basil has almost nothing to do with basil.

The usual conversion rule is about one third of the quantity when moving from fresh to dried, since drying concentrates the dry matter. A tablespoon of chopped fresh parsley corresponds roughly to a teaspoon of dried, bearing in mind the profile will not be identical.

Two habits that change the result. Chop at the last moment, because essential oils escape as soon as the cells are opened. And use the tender stalks of parsley and coriander, often more aromatic than the leaves, in stocks and blended sauces. For storage, see our article on preserving herbs by freezing, salting or in oil.

Spices: dosage and honesty

Three principles cover most of it.

Toast whole spices dry in a pan without fat, over medium heat, until the aroma rises, which takes thirty to sixty seconds. Then grind. The heat releases volatile compounds and the difference is clearly noticeable with cumin, coriander seed, fennel and cardamom.

Write your doses down at the start. A level teaspoon of ground cumin for four portions of pulses is a reasonable starting point. Note what you used and correct at the next meal. Memory for dosage is poor, a notebook is better. Our guide to measuring spices in homemade curries has full tables.

Buy small and replace. Ground spice loses most of its value in six to twelve months. A cupboard of jars opened three years ago explains a lot of bland dinners.

A word on health claims. Turmeric, ginger and cinnamon are routinely presented as antioxidant or anti-inflammatory. Those molecules do have measurable activity in the laboratory, but culinary doses are far below the doses tested, and no solid clinical benefit justifies treating them as therapy. Use them because they taste good. That is reason enough. Our article on essential spices and herbs for flavourful veggie cooking goes through the aromatic profiles.

The salt you keep: iodised, substituted, or neither

For anyone who uses table salt, the WHO suggests replacing it with a lower-sodium substitute containing potassium, and adds that all salt consumed should be iodised.

These substitutes, usually a blend of sodium chloride and potassium chloride, have a documented effect. The SSaSS trial measured a 3.3 mmHg fall in systolic pressure, and a review in Current Opinion in Cardiology in 2026 concludes that they are more effective and more practical than conventional low-sodium diets for lowering pressure and reducing the risk of recurrent stroke.

That same review insists on a caveat that is not theoretical. People with impaired kidney function or on certain medicines acting on renal physiology need to be careful, because potassium accumulates. A case published in Cureus in 2025 describes an 88-year-old man with chronic kidney disease, in hospital, found to have marked hyperkalaemia at 7.5 mEq/L after his family brought in a potassium-enriched salt to improve the taste of hospital meals. He had no symptoms. If you have kidney disease, heart failure, long-standing diabetes or blood pressure medication, discuss these substitutes with your doctor before adopting them. That is not a formality.

Finally, the question that never goes away: gourmet salts. Himalayan pink salt, Hawaiian red salt, fleur de sel and grey sea salt contain roughly as much sodium as table salt, around 39 % by mass. The extra minerals are present in trace amounts and contribute nothing nutritionally meaningful at culinary doses. Their value is textural and aromatic. A large fleur de sel crystal placed on the surface at the last moment delivers a sharp salty peak with very little total sodium, which is a genuine advantage, but for a mechanical reason rather than a mineral one. On the other hand these salts are almost never iodised, which is a real drawback in Switzerland. Gomasio does genuinely reduce sodium by volume, because it is mostly sesame.

A gradual four-week method

The strongest argument for going slowly comes from the physiology of taste, and it is old. A study in the American Journal of Clinical Nutrition in 1982 followed adults who reduced their sodium over five months: the salt concentration they found most pleasant in soup and crackers fell, while it did not in the control group. Preference recalibrates.

An important experimental detail came next. A study in Physiology & Behavior in 1986 compared people adding crystalline salt to their food with people swallowing salt tablets. Both groups excreted more sodium, but only the group salting their food saw their preferred concentration rise. It is taste exposure that recalibrates preference, not the sodium load itself. Which means reducing what you actually taste works, independently of everything else.

Week 1: change nothing about how you cook, but read the labels on five products you buy every week. Bread, cheese, tomato sauce, stock, savoury biscuits. Note the grams of salt per 100 g.

Week 2: swap the two saltiest products on that list for a lower-salt version or a homemade one. This is where most of the gain sits.

Week 3: in the kitchen, cut the salt by a third and always add an acid at the end. Lemon juice, vinegar, tomato. Change nothing else, so you can attribute the effect.

Week 4: cut by another third and work on browning. Vegetables roasted to real caramelisation, toasted spices, onions cooked long. Keep an iodised salt for finishing, in small amounts, on the surface.

After a month, taste a ready meal you used to enjoy. Most people find it too salty. That is the recalibration showing up.

Three recipes with real quantities

Carrot, ginger and lemon soup, 4 portions

Cook 1 large chopped onion in 1 tablespoon of olive oil for 8 to 10 minutes, to a proper golden colour. Do not rush this step. Add 700 g of sliced carrots, 15 g of grated fresh ginger, 1 teaspoon of toasted ground cumin and half a teaspoon of turmeric. Cover with 700 ml of water, bring to the boil, then simmer for 20 minutes. Blend. Off the heat, add the juice of half a lemon, about 20 ml, and a tablespoon of nutritional yeast. Taste. If it still falls flat, reach for acid before you reach for salt. Finish with a maximum of 2 g of iodised salt and plenty of chopped coriander.

Red lentil curry with coconut milk, 4 portions

Heat 1 tablespoon of oil and cook 1 onion, 2 garlic cloves and 15 g of finely chopped ginger for 6 minutes. Add 2 teaspoons of mild curry powder, 1 teaspoon of smoked paprika and 1 tablespoon of tomato purée. Cook for 2 minutes to toast them. Add 250 g of red lentils, 400 ml of coconut milk and 400 ml of water. Simmer for 18 minutes. Off the heat, add the juice of half a lime. The smoked paprika and tomato purée do the work salt would otherwise do: Maillard aromas and umami.

Quinoa salad with orange and mint, 4 portions

Cook 200 g of quinoa in unsalted water, drain and let it cool slightly. Add the segments of 2 oranges, 20 g of chopped mint, 3 sliced spring onions and 60 g of dry-toasted crushed cashews. Dressing: 40 ml of orange juice, 15 ml of cider vinegar, 40 ml of olive oil, half a teaspoon of toasted cumin, pepper. The zest of half an orange added at the last moment changes the whole profile. The toasted cashews bring the texture and the roasting compounds that stand in for salt.

Ten common mistakes

  1. Cutting salt in the kitchen while still buying the saltiest processed products. The most common imbalance by far.
  2. Removing salt without thinking about iodine. In Switzerland that is the real risk of this project.
  3. Believing pink salt or fleur de sel are less salty. They contain as much sodium and are almost never iodised.
  4. Treating miso and soy sauce as salt substitutes. They contain plenty of it.
  5. Adding tender herbs at the start of cooking, where their volatile compounds are lost.
  6. Cooking vegetables without browning them. Without the Maillard reaction there is little left to compensate.
  7. Adding citrus juice too early. It loses its edge, whereas zest holds up to heat.
  8. Using spices ground two years ago and concluding that spices do not work.
  9. Adopting a potassium substitute without medical advice if you have kidney disease or cardiac medication.
  10. Changing everything in a week. Taste preference recalibrates over weeks, not days.

Who needs to be careful

Cutting salt is not equally appropriate for everyone. People who sweat heavily during prolonged effort, those with low symptomatic blood pressure, certain salt-losing kidney conditions, adrenal insufficiency and some diuretic treatments all call for individual guidance. Children have different reference points: the NHS sets a maximum of 2 g of salt a day between ages 1 and 3, and under 1 g before the age of 1, because their kidneys are not mature.

This article describes population-level reference points and cooking techniques. It does not replace medical advice and gives no individual dosage.

Frequently asked questions

Should the goal be zero added salt? No. The documented target is getting under 5 g a day in total, and that is decided mainly by what you buy. A pinch of iodised salt to finish stays compatible with it.

Is unrefined sea salt better? In sodium terms, no. It carries trace minerals with no nutritional effect at culinary doses, and it is rarely iodised.

Can seaweed replace salt? Partly, for the iodine and umami, but it sometimes concentrates a great deal of iodine. The FSVO recommends moderation, since overdose can cause rhythm disturbance, disturbed sleep or tremor.

How long before food stops tasting bland? The 1982 study ran over five months and found a clear shift in preference. In practice most people notice a change within three to six weeks.

Does potassium have to come from a salt substitute? Not necessarily. Swiss intake averages 2.7 g against the WHO recommendation of at least 3.5 g. Vegetables, fruit, pulses, nuts and wholegrains close that gap without supplements.

Can an under-salted dish genuinely taste salty? Work on odour-induced saltiness enhancement shows a real effect under controlled conditions, with substantial increases in perceived saltiness for certain volatile compounds. In the kitchen it translates into one simple instruction: brown it, toast it, caramelise it.

Sources