Sodium vs. Salt: The Essential Distinction
The two words get used interchangeably, but they're not the same thing. Sodium (Na⁺) is the essential mineral your body actually needs. Table salt (NaCl) is a compound of sodium and chloride — about 40% sodium and 60% chloride by weight.
Example: a product listing 800mg of sodium contains roughly 2.0g of salt (0.8 × 2.5). Nutriofia tracks sodium directly — check any food's profile page for its exact figure — because that's what every clinical guideline and the WHO target are actually expressed in.
Daily Targets Across the Lifespan (UK SACN / NHS)
The body's baseline requirement for cellular function is modest — around 500mg of sodium (about 1.25g of salt) a day under normal conditions. Public health targets sit well above that, because they're upper limits set against typical dietary exposure, not minimums.
| Age group | Max salt / day | Sodium equivalent |
|---|---|---|
| 0–12 months | No salt added to food | Met via breast milk / formula |
| 1–3 years | 2.0g | 800mg |
| 4–6 years | 3.0g | 1,200mg |
| 7–10 years | 5.0g | 2,000mg |
| 11+ years & adults | 6.0g (~1 level tsp) | 2,400mg |
The WHO target for adults is stricter still: under 5g salt/day (under 2,000mg sodium). The American Heart Association recommends an even tighter 1,500mg sodium/day for adults with existing hypertension, cardiovascular risk, or chronic kidney disease.
Infant kidneys genuinely cannot handle it. A baby's kidneys aren't developed enough to filter concentrated sodium loads safely — this is why "no added salt" for food cooked for a baby isn't overcaution, it's a hard physiological limit. Nutriofia's own weaning guidance in Grow Well follows the same principle.
Types of Salt: Marketing vs. Chemistry
Every gourmet salt on a supermarket shelf is still overwhelmingly sodium chloride — 94% to 99% of it, regardless of colour, price or origin story.
| Type | Composition | Reality |
|---|---|---|
| Table salt | ~99% NaCl + anti-caking agent | Often iodised — a genuinely useful, not cosmetic, addition. |
| Sea salt | 98–99% NaCl + trace Mg, Ca, K | Trace mineral content is nutritionally negligible. |
| Himalayan pink salt | ~98% NaCl + trace iron oxide | The ~80 trace minerals are present in parts-per-million — far too little to matter nutritionally. |
| Celtic grey salt | ~94–97% NaCl, higher moisture | Lower sodium density per spoon is a water-content effect, not a health one. |
| Kosher salt | ~99% NaCl, rarely iodised | Coarse flakes give better manual dosage control when cooking. |
| Potassium-enriched (e.g. LoSalt) | ~66% KCl / ~33% NaCl | The only type with real trial evidence for lowering blood pressure. Contraindicated in kidney disease or on ACE inhibitors/ARBs — risk of hyperkalaemia. |
The only salt with genuine clinical backing beyond flavour is the potassium-enriched type — randomised trials consistently show it lowers systolic blood pressure and reduces stroke incidence at a population level, because it directly improves the sodium:potassium balance discussed in our Understanding Nutrient Ratios guide. To get even 10% of your daily magnesium from Himalayan salt, by contrast, you'd need over 100g of salt a day — nowhere near a realistic amount, and a serious excess of sodium long before it got you there.
What Too Much Salt Does to the Body
- Vascular stress. Excess sodium blunts nitric oxide production in blood vessel walls, impairing their ability to relax — over time this drives arterial stiffening and sustained high blood pressure.
- Cardiovascular strain. Chronic hypertension forces the heart's left ventricle to thicken (left ventricular hypertrophy), raising long-term risk of heart attack, heart failure and stroke.
- Kidney strain. The kidneys work harder to excrete the surplus, raising pressure inside the filtering units and accelerating chronic kidney disease over time.
- Bone mineral loss. Sodium and calcium share a reabsorption pathway in the kidney — excreting more sodium forces more calcium out in the urine too, a slow contributor to bone density loss over decades.
- Gastric cancer risk. High salt intake damages the stomach's protective mucosal lining and measurably worsens the effect of H. pylori infection — animal studies found gastric cancer in all high-salt-diet/infected subjects versus a majority-lower rate on a normal-salt diet with the same infection, and human studies consistently show higher salt intake among gastric cancer patients than matched healthy controls.
What Too Little Salt Does to the Body
Population-level excess is the dominant public health problem, but genuine deficiency or aggressive restriction isn't harmless either:
- Hyponatremia (blood sodium below 135 mmol/L) — usually from excessive fluid intake (endurance athletes drinking too much plain water) or diuretic misuse, rather than diet alone. Causes confusion, seizures, and in severe cases, life-threatening brain swelling.
- Hormonal compensation. Very low intake triggers the renin-angiotensin-aldosterone system to aggressively conserve every remaining sodium ion — and prolonged restriction can activate the sympathetic nervous system to maintain blood pressure another way.
- Metabolic side effects. Some controlled studies found very-low-sodium diets modestly raised triglycerides and reduced insulin sensitivity in certain individuals — a real but debated finding, not a reason to abandon a moderate target.
Where Sodium Actually Comes From
The table salt shaker is not where most dietary sodium comes from. Widely cited breakdowns (originally US-derived, but the pattern holds across industrialised food systems) put processed and packaged food at roughly 70–75% of total intake, restaurant and takeaway food at 10–15%, naturally occurring sodium in whole foods at around 10%, and salt added at the table or in home cooking at just 5–10%.
Whole foods naturally higher in sodium
Sea vegetables (kelp, nori, dulse), celery, Swiss chard, beetroot, shellfish and fresh dairy all carry meaningful natural sodium without a grain of salt added.
Whole foods naturally free of sodium
Fresh fruit, uncooked whole grains, dried legumes, raw nuts and seeds, and most garden vegetables all sit under 10mg per 100g — check any specific food's exact figure on its Nutriofia profile page.
Practical Takeaways
- Target the invisible salt. Bread, cured meats, canned goods in brine, soups, stock cubes and condiments (soy sauce, miso) do far more damage than the shaker.
- Prioritise the ratio, not just the restriction. Increasing potassium-rich whole foods — leafy greens, root vegetables, legumes — does as much for blood pressure as cutting sodium alone. See our Sodium:Potassium ratio tool to check your own 7-day balance.
- Use flavour synergy instead of more salt. Acidity (citrus, vinegar), alliums and spices activate other flavour receptors, delivering satisfaction with a fraction of the sodium load.
Sources: SACN salt and health guidance; NHS "Salt: the facts"; WHO sodium intake guideline for adults and children (2012); American Heart Association sodium recommendations. Zhu C, et al. High-Salt Diet Exacerbates H. pylori Infection and Increases Gastric Cancer Risks. J Pathol. 2023 (gastric cancer mechanism). LoSalt composition per manufacturer product listing.
This article is educational and does not constitute medical advice. If you manage hypertension, kidney disease, or take blood pressure medication, discuss significant dietary sodium changes with your healthcare team.