Sodium and Blood Pressure

How Sodium Affects Blood Pressure

Sodium — the main component of salt — has a direct and well-established relationship with blood pressure. The primary mechanism is fluid balance: sodium causes your body to hold onto water to maintain the right concentration in your bloodstream. More retained water means more blood volume, and more volume in the same vessels means higher pressure — much like turning up the water supply to a hose. There's also evidence that excess sodium affects blood-vessel function more directly, stiffening vessels over time.

The DASH-Sodium trial demonstrated this clearly: reducing sodium lowered blood pressure, and combining sodium reduction with the DASH diet produced the largest reductions of all (PMID 11136953). Sodium reduction is one of the most consistently effective dietary changes for blood pressure.

Salt Sensitivity

Not everyone responds to salt equally. Some people are 'salt-sensitive' — their blood pressure rises and falls significantly with sodium intake — while others are more resistant. Salt sensitivity tends to be more common in older adults, people with existing hypertension, and certain populations. Since you can't easily know your own sensitivity without testing, and since most people eat far too much sodium anyway, reducing intake is sensible advice across the board.

How Much Is Too Much?

General guidance recommends limiting sodium to less than 2,300 mg a day — roughly a teaspoon of salt — with an ideal target closer to 1,500 mg for many adults, particularly those with high blood pressure. The reality is sobering: average intake in many countries is well above 3,000 mg, sometimes far higher. Most people are consuming roughly double the ideal amount without realising it.

Where the Sodium Actually Hides

Here is the crucial insight: the salt shaker on your table isn't the main problem. The large majority of dietary sodium — often around three-quarters — comes from processed, packaged and restaurant foods. Major hidden sources include:

• Bread and baked goods - not salty-tasting, but eaten in quantity, a leading source.
• Processed and cured meats - deli meats, bacon, sausages, ham.
• Cheese - especially processed cheese.
• Canned soups, broths and sauces - often extremely high in sodium.
• Pizza, sandwiches and fast food - among the biggest contributors.
• Snack foods - chips, crackers, salted nuts.
• Condiments - soy sauce, ketchup, salad dressings, stock cubes.
• Ready meals and frozen dinners - convenience at a sodium cost.

Practical Ways to Cut Sodium

1. Cook at home more often. This single change gives you control over the biggest source of hidden sodium.
2. Read labels. Compare products and choose lower-sodium versions — the differences are often large.
3. Rinse canned foods like beans to wash off some of the sodium.
4. Use herbs, spices, citrus and vinegar for flavour instead of salt.
5. Choose fresh or frozen plain vegetables over canned or sauced versions.
6. Limit processed meats, fast food and ready meals.
7. Cut back gradually. Your taste buds adjust over a few weeks, and food that once seemed bland becomes normal — while heavily salted food starts to taste too salty.

Sodium and Potassium: The Balance

Sodium doesn't act alone — its effect is closely tied to potassium, which works in the opposite direction. Modern diets tend to be high in sodium and low in potassium, exactly the wrong balance. So the most effective dietary strategy is twofold: cut sodium and increase potassium from fruits, vegetables and legumes. The DASH diet does both simultaneously, which is a large part of its power.

The Bigger Picture

Reducing sodium is one of the highest-impact dietary changes you can make for blood pressure — free, accessible and well-evidenced. It works best alongside increasing potassium, following a DASH-style pattern, exercising and managing weight. A supplement like Arteris Plus is at most a minor complement to these fundamentals; cutting the hidden sodium in your diet will almost certainly do more for your blood pressure than any capsule.