The latest results from the Third National Health and Nutrition Examination Survey (NHANES III) included a special analysis designed to study the association of major dietary factors with blood pressure. Data on dietary intake of elements such as sodium, potassium, calcium, and magnesium, plus protein, alcohol, and total energy was collected for more than 17,000 adults.

Here's what they found:

• A diet low in sodium and protein is associated with lower systolic blood pressure.
• Potassium intake was associated with lower systolic and diastolic blood pressure.
• Low alcohol intake was associated with lower diastolic and systolic blood pressure.
• Age-related changes in systolic blood pressure were moderated by higher calcium and protein intake.
• Magnesium was not associated with any changes in blood pressure.

Source:  Hajjar IM, Grim CE, George V, et al. Impact of diet on blood pressure and age-related changes in blood pressure in the US population. Archives of Internal Medicine, 2001;161:589-593. (Abs.)