City-dwelling adults in Cameroon are excreting way more salt in their urine than people living in the forest who hunt and gather food — more than double — which probably means they're eating a lot more salt in their diets.

In adults from Cameroon, the more salt they have in their urine, the more likely they are to have high blood pressure — every little bit of extra salt is tied to a slightly higher chance of high blood pressure, even after considering age, weight, and belly size.

In city-dwelling Bantu adults in Cameroon, higher blood pressure tends to go hand-in-hand with more salt coming out in their urine — and this link still holds true even when accounting for age, weight, and belly size.

After South Africa started limiting salt in processed foods, people in a rural area were found to be eating less salt — and that drop stayed steady for years.

People in remote, pre-industrial communities eat way less salt—between 1 and 3 grams a day—compared to over 9 grams in modern industrialized places, based on urine tests that measure salt levels.

In older adults in rural South Africa, the less salt they eat, the lower their blood pressure tends to be — every gram of salt saved drops blood pressure by a small but measurable amount.