Doctors talk for years about cutting salt, yet a simple tweak in what we sprinkle on food still barely catches on.
New research presented at a major cardiology meeting suggests that a low-cost, supermarket-level change in the kitchen could help millions manage high blood pressure, but very few people actually use it.
Hypertension, a quiet giant of chronic disease
High blood pressure is one of the most common long-term conditions worldwide. It affects younger adults, but rates soar with age. In France, for instance, less than 10% of 18–34-year-olds live with hypertension, compared with more than 65% of people over 65, according to public health data.
Hypertension means the pressure of blood pushing against artery walls stays too high over time. That strain damages vessels and forces the heart to work harder. Over years, it raises the risk of heart attack, stroke, kidney disease and heart failure.
Triggers combine. Diets rich in processed foods, chronic stress, frequent alcohol, lack of movement and other medical problems such as kidney or hormonal disorders all add up. Faced with this mix, doctors usually give a familiar set of recommendations: eat more plants, move more, sleep better, stop smoking, limit alcohol.
Buried in the lifestyle advice is a very specific suggestion: cut back on sodium by swapping regular table salt for a potassium-based alternative. A new US study shows that this particular tip barely reaches people’s plates.
Less than 6% of adults with hypertension use salt substitutes
At the American Heart Association’s Hypertension Scientific Sessions 2025, researchers from UT Southwestern Medical Center in Dallas presented data on salt habits among more than 37,000 US adults aged 18 and older.
The team sorted participants into four groups, based on whether they had high blood pressure and whether they were being treated for it. They then looked at the type of salt people reported using at home:
- regular salt (table, sea or kosher)
- salt substitutes (often enriched with potassium or other alternatives)
- no added salt
Across all adults in the study, fewer than 6% reported using salt substitutes, even among people diagnosed with hypertension.
Lead author Yinying Wei, a doctoral researcher in clinical research and hypertension, stressed that these products are relatively inexpensive and could help adults whose blood pressure remains stubbornly high despite pills and lifestyle advice.
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How salt drives blood pressure up
Regular table salt is mostly sodium chloride. Sodium is the problem element in the context of high blood pressure. When sodium intake stays high, the body holds on to more water. Blood volume increases, so pressure within arteries rises.
That extra pressure gradually damages the inner lining of blood vessels. Arteries stiffen and narrow, making it even harder for blood to pass through. The heart must pump with greater force, which strains the muscle over time.
The American Heart Association sets a maximum of 2,300 milligrams of sodium per day for adults, with a target of 1,500 milligrams for those with hypertension. Many people blow past those numbers without realising it, because sodium hides in bread, cheese, sauces, soups, deli meats and ready-made meals.
Cutting just 1,000 milligrams of sodium per day can lead to a measurable drop in blood pressure and a lower risk of heart and vascular events.
Even modest improvements in blood pressure ripple through long-term health: fewer heart attacks, less heart failure, slower progression of atherosclerosis, and relief from daily symptoms like fatigue, headaches and shortness of breath.
What exactly are salt substitutes?
Salt substitutes look and shake like standard salt, but their chemistry is different. Instead of being made entirely from sodium chloride, they often swap part or all of the sodium for potassium salts, such as potassium chloride.
Potassium has a taste profile that feels close to salt, especially in savoury dishes. It also tends to counter some effects of sodium in the body. Higher potassium intake helps blood vessels relax and supports healthier blood pressure.
Typical features of salt substitutes
| Type | Main component | Typical use |
|---|---|---|
| Regular table salt | Mostly sodium chloride | General cooking and seasoning |
| Mixed salt substitute | Blend of sodium and potassium salts | Step-down option for people reducing sodium |
| Low-sodium / no-sodium salt | Mostly potassium salts or other minerals | For people with hypertension or very low sodium targets |
In trials from several countries, these products often show modest, but real, reductions in blood pressure across populations, especially where traditional diets rely heavily on salt.
Why such a simple tool remains underused
If swapping the salt shaker is so straightforward, why do so few people with hypertension do it?
Researchers and clinicians point to several likely reasons. Many people simply do not know these alternatives exist or do not understand how sodium affects blood pressure. Food marketing tends to highlight “sea salt” or “artisanal” salt as healthier, even though sodium content remains similar.
There is also habit. Salt is woven deeply into cooking traditions. A change in flavour, even a subtle one, can meet resistance at the family table. Some people find that high-potassium salts taste slightly bitter or metallic, especially in baking or very simple dishes like fried eggs.
Cost and availability might play a smaller role. While described as low-cost, substitutes can still be pricier than the large tubs of standard salt found in discount shops, and not every small supermarket stocks several kinds.
Who should be careful with potassium-based products?
Salt substitutes are not a free pass for everyone. For most healthy adults, extra potassium from food is safe, and often beneficial. But some groups need medical advice before switching.
- People with chronic kidney disease may struggle to clear potassium from the blood.
- Those taking certain blood pressure medicines, such as ACE inhibitors or ARBs, may already retain more potassium.
- Patients on potassium-sparing diuretics or some heart failure drugs face similar issues.
For anyone with kidney problems or multiple heart medications, a GP or specialist should check whether a potassium-based salt is appropriate.
When the kidneys do not work well, potassium can accumulate, leading to abnormal heart rhythms. That risk does not cancel the potential public health gains of salt substitution, but it means personal medical context matters.
How a household could actually make the switch
A theoretical benefit only matters if it fits into real life. A common scenario goes like this: someone in their 50s is told they have high blood pressure. They leave the clinic with a prescription and a short conversation about reducing salt and processed food.
At home, there are a few realistic ways to use salt substitutes without dramatically changing taste:
- Replace the table salt used at the table with a mixed sodium–potassium product first, not a zero-sodium version.
- Use the substitute for boiling vegetables, potatoes, rice or pasta, where other flavours dominate.
- Keep regular salt for baking where texture matters, but reduce the amount by a quarter and add herbs or spices.
- Read labels on stock cubes, sauces and ready meals, which often contain most of the day’s sodium in a single portion.
Over a few weeks, taste buds tend to adapt. Many people start to notice natural flavours more and rely less on heavy salting. The hope among researchers is that if even a fraction of people with hypertension made this type of change, population-level blood pressure could shift downwards.
Beyond the shaker: combining strategies for lower blood pressure
Salt substitutes are only one tool, and they work best when paired with other changes. A pattern of eating rich in fruits, vegetables, legumes, nuts and whole grains naturally brings more potassium and less sodium. The DASH diet, often recommended by cardiology societies, follows this logic.
Cutting back on processed meat, instant noodles, packet soups and salty snacks can have a similar or even larger effect than changing table salt. A 30-minute brisk walk most days, lighter alcohol intake and consistent sleep add pressure-lowering effects that stack up over time.
For someone already on medication, these steps do not usually replace pills, but they can make each tablet more effective. Doctors sometimes find that patients who cut sodium and increase physical activity need fewer drugs or lower doses to stay controlled.
Key terms and what they really mean
Hypertension can feel like a vague label, so a few terms are worth clarifying:
- Systolic pressure: the top number in a blood pressure reading, showing the pressure when the heart contracts.
- Diastolic pressure: the bottom number, measured when the heart relaxes between beats.
- Resistant hypertension: blood pressure that stays high despite using at least three medications, usually including a diuretic.
- Low-sodium diet: usually means aiming for 1,500–2,000 milligrams of sodium per day, not removing all salt from food.
Against this backdrop, the message from the new US data is fairly direct: a cheap, fairly simple method to cut sodium and nudge blood pressure down exists, yet almost nobody uses it. For health systems under strain from heart disease and stroke, that gap between evidence and daily life remains a major missed opportunity.
Originally posted 2026-02-10 02:54:23.