Health Claims

To really know how much salt someone eats, you need to collect all their urine for a full day—other methods like surveys or single urine samples are often wrong and can make it look like eating too little salt is harmful when it’s not.

Descriptive

Using a salt substitute with less sodium and more potassium can significantly lower the risk of stroke and death in older people with high blood pressure or a history of stroke.

Correlational

Eating less salt and more potassium together lowers blood pressure better than just cutting salt or just adding potassium alone—and that’s why the DASH diet works so well.

Mechanistic

If you eat a little more potassium-rich food each day—like bananas or spinach—you might lower your risk of stroke and reduce your blood pressure a bit, even if you don’t change how much salt you eat.

Correlational

If you have high blood pressure and eat less salt—cutting from about 4.6 grams down to 1.5–2.4 grams a day—your blood pressure will likely go down a bit, especially if you're older, Black, or have kidney disease or metabolic syndrome.

Correlational

Cutting back on salt helps lower blood pressure, and this works just as well whether you do it for a few weeks or up to a year—only a tiny bit less after a long time.

Descriptive

Cutting salt by changing your whole diet (like eating more fruits and veggies) lowers blood pressure more than just taking salt pills to replace it.

Causal

If you eat less salt, your blood pressure goes down steadily — even at very low salt levels, cutting back more still helps lower it.

Quantitative

Cutting down on salt lowers blood pressure more for people who already have high blood pressure than for those with normal blood pressure—about 2.5 times more.

Quantitative

If you cut down how much salt you eat from a lot to very little, your blood pressure will go down—by about 15 points for the top number and 10 points for the bottom number—and this works best if you already have high blood pressure.

Causal

Switching to salt substitutes probably helps lower blood pressure for people everywhere, no matter where they live or who they are.

Descriptive

Using salt substitutes helps lower blood pressure in pretty much everyone—no matter how old they are, whether they're male or female, how high their blood pressure started, or where they live.

Descriptive

Using salt substitutes instead of regular salt might help adults live longer and have fewer heart problems like heart attacks or strokes.

Causal

If you replace some of the regular salt in your food with a salt substitute that has less sodium, your blood pressure might drop a little — about 1.5 points for the top number and 1 point for the bottom number for every 10% less salt you use.

Correlational

Using salt substitutes that have less sodium and more potassium can lower your blood pressure a little, which might help you avoid heart problems and live longer.

Causal

Most of the studies that looked at whether potassium lowers blood pressure aren’t very reliable—many didn’t properly hide who got the potassium or only reported the results they liked.

Descriptive

If you eat more potassium-rich foods, your blood pressure goes down in a straight-line way—more potassium means lower blood pressure, and this keeps happening all the way up to a pretty high amount, at least for people with high blood pressure.

Causal

If you have high blood pressure, eating more potassium might lower it more than it does for someone with normal blood pressure.

Causal

If you eat more potassium every day—like from bananas or potatoes—your blood pressure might drop just a tiny bit, but not enough to matter for your health if you don’t already have high blood pressure.

Correlational

If adults with high blood pressure eat more potassium-rich foods—like bananas or spinach—by about 50 mmol per day, their blood pressure numbers go down a bit, which might help lower their risk of heart problems.

Causal

In older people in the Netherlands, how much salt they say they eat doesn’t seem to link to more heart problems or early death — maybe they’re not reporting it right, or salt just doesn’t affect them much at the levels they’re eating.

Correlational

For older people in the Netherlands, how much potassium they pee out doesn’t seem to predict whether they’ll have a heart problem or die sooner—even though very low levels might hint at a slightly higher risk. This means a single urine test might not tell us how much potassium they’ve been eating over time.

Correlational

For older people in the Netherlands, eating a lot or a little salt doesn’t seem to reliably make heart problems or death more or less likely—even if they’re overweight. So salt intake probably isn’t a strong predictor of health outcomes in this group.

Correlational

For older adults who are overweight but don’t have heart disease or high blood pressure, eating more salt than potassium might raise their chance of dying within 5 years by about 19%—so it’s not just how much salt or potassium you eat, but how they balance each other.

Correlational