Sodium excretion levels don't affect blood pressure, heart rate, or how much blood the heart pumps when lying down.

The levels of various blood chemicals like electrolytes, hormones, and kidney markers don't change based on how much sodium someone excretes in their urine.

People who pee out more salt tend to have higher blood pressure, and their blood pressure tends to rise faster as they get older—but in whole populations, the average blood pressure and how many people have high blood pressure don’t seem to change based on salt levels.

People with high blood pressure who aren't taking medication have similar sodium excretion and body fluid levels outside their cells as people with normal blood pressure.

If you have heart disease and eat more salt, your blood pressure tends to go up — for every extra gram of salt you excrete in urine, your top blood pressure number goes up by about 1.3 points and your bottom number by about 0.5 points.

People who excrete more sodium in their urine tend to have more fluid outside their cells.