Two hours after eating a high-potassium meal, people with controlled high blood pressure have slightly higher diastolic blood pressure compared to a low-potassium meal, though the difference is small.

When people with controlled high blood pressure eat a meal high in potassium, their blood potassium levels go up significantly compared to a low-potassium meal, especially within an hour and two hours after eating.

One hour after eating a high-potassium meal, people with controlled high blood pressure have higher blood fat levels compared to a low-potassium meal, which is a statistically significant difference.

One hour after eating a low-potassium meal, people with controlled high blood pressure have higher blood sugar levels than after a high-potassium meal, which is a statistically significant difference.

Eating more potassium can lower blood pressure in people who already have high blood pressure, but it doesn’t help people with normal blood pressure — so it’s like a targeted fix just for those who need it.

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.