Salt is essential for your body to function, but most people eat far more than they need. The sweet spot is roughly a teaspoon of salt per day (less than 2,000 mg of sodium), according to the World Health Organization. Below that floor, your body struggles. Above it, the risks to your heart, blood vessels, and stomach start climbing.
Why Your Body Needs Sodium
Sodium is one of the key electrolytes that keeps your body running. It regulates how much fluid you retain, which directly controls your blood volume and blood pressure. Every time a nerve fires or a muscle contracts, sodium ions are part of the signaling chain that makes it happen. Without enough sodium, those basic systems falter.
Your body can’t manufacture sodium on its own, so you have to get it from food. But the amount you actually need is small. A healthy blood sodium level sits between 135 and 145 millimoles per liter, and your kidneys work constantly to keep it there by adjusting how much sodium you excrete in urine.
What Happens When You Get Too Little
When blood sodium drops below 135 mmol/L, a condition called hyponatremia, the effects can range from mild to dangerous. Early symptoms include nausea, headache, fatigue, and irritability. As levels fall further, you can experience muscle cramps, confusion, seizures, and in severe cases, coma. This is relatively uncommon in people eating a normal diet. It’s more likely in endurance athletes who drink excessive water without replacing electrolytes, older adults on certain medications, or people with kidney or hormonal conditions.
How Too Much Salt Affects Your Heart and Arteries
The bigger concern for most people is eating too much. When you take in excess sodium, your body holds onto extra water to dilute it, expanding your blood volume. That increased volume pushes harder against your artery walls, raising blood pressure. Over time, this isn’t just a pressure problem. The artery walls themselves change.
High sodium intake triggers a cascade inside your blood vessels. The cells lining your arteries stiffen, the muscular layer of the vessel wall thickens, and structural proteins like collagen accumulate and cross-link in ways that make the vessels less elastic. Think of it like a rubber band that slowly loses its stretch. This arterial stiffness forces your heart to pump harder, creating a cycle that accelerates cardiovascular damage. The local hormone systems within artery walls become more reactive under high-salt conditions, further amplifying stiffness.
Not everyone responds to salt the same way. Roughly 50% of people with high blood pressure and about 25% of people with normal blood pressure are considered “salt-sensitive,” meaning their blood pressure rises significantly in response to sodium. This trait is partly genetic, involving variations in genes that control how your kidneys handle sodium and how your blood vessels react to pressure changes. If high blood pressure runs in your family, you’re more likely to fall into this group.
Salt and Stomach Cancer Risk
Beyond cardiovascular disease, high salt intake is linked to stomach cancer. A meta-analysis found that people with high salt intake had a 68% greater risk of gastric cancer compared to those with low intake. Even moderate salt consumption raised the risk by 41%. A large Japanese study found that stomach cancer patients consumed noticeably more salt than those without cancer: 7.8 grams per day versus 6.4 grams. The mechanism likely involves salt damaging the stomach lining over time, making it more vulnerable to cancer-causing agents.
Where the Salt Actually Comes From
If you’re thinking about cutting back, putting down the salt shaker is a start, but it won’t solve the problem. Over 70% of the sodium in most people’s diets comes from packaged and prepared foods, not from salt added at the table or during cooking. Bread, deli meats, canned soups, frozen meals, cheese, sauces, and restaurant food are the primary contributors. A single fast-food meal can easily contain an entire day’s worth of sodium.
Reading nutrition labels is the most practical step you can take. Sodium content varies enormously between brands of the same product. Choosing lower-sodium versions of the foods you already eat tends to be more sustainable than overhauling your diet entirely.
The Potassium Connection
Sodium doesn’t act alone. Potassium works as its counterbalance. While sodium raises blood pressure by increasing fluid retention, potassium helps your body excrete sodium and relaxes blood vessel walls, lowering pressure. Most people eat too much sodium and too little potassium, which is the worst combination for cardiovascular health. Increasing your potassium intake through fruits, vegetables, beans, and potatoes can help offset some of the blood pressure effects of sodium. The balance between the two matters as much as the absolute amount of either one.
Sea Salt, Himalayan Salt, and Table Salt
Specialty salts are often marketed as healthier alternatives, but the differences are minimal. Sea salt retains trace minerals because it’s less processed than table salt, but those minerals exist in such tiny amounts that they don’t meaningfully contribute to your nutrition. By weight, sea salt and table salt contain comparable amounts of sodium. Himalayan pink salt is similar: the iron oxide that gives it color and the trace minerals it contains are nutritionally insignificant at the amounts you’d use in food. Choosing a fancier salt doesn’t change the health equation.
The one practical difference is texture and crystal size. Coarse sea salt or flaky finishing salt can make food taste saltier with less actual sodium, simply because larger crystals dissolve on your tongue more noticeably. Using these as a finishing touch rather than mixing fine salt throughout a dish is a minor but real strategy for reducing intake without sacrificing flavor.
How Much You Should Aim For
The WHO recommends less than 2,000 mg of sodium per day for adults, which equals about 5 grams (just under a teaspoon) of salt. For children aged 2 to 15, the recommendation is proportionally lower based on their calorie needs. Most adults in Western countries consume 3,400 mg or more daily, nearly double the guideline.
Perfection isn’t necessary. Even modest reductions in sodium intake lower blood pressure measurably, especially if you’re salt-sensitive or already have elevated pressure. Pairing that reduction with more potassium-rich foods amplifies the benefit. Salt is not your enemy at the right dose. It’s a nutrient your body genuinely requires. The problem is that modern food systems deliver it in quantities your body was never designed to handle.