an analysis of the third National Health and Nutrition Examination Survey (NHANES III) was designed to investigate the impact of dietary calcium intake on age-related changes in blood pressure and pulse pressure
data on 17,030 participants 20 years or older (mean age, 48.8+/-0.2 years; 47% male, 42% Caucasian, and 28% African American) were used
other data included demographics, body mass index, blood pressure, and daily dietary calcium
after adjustment for demographic and anthropomorphic variables, as well as total energy consumption, higher calcium intake was associated with lower rates of age-related increases of systolic blood pressure and pulse pressure (p<0.001)
the study authors concluded
if the calcium intake of the general population were to increase to above 1200 mg, the incidence of isolated systolic hypertension in the elderly might be decreased
a systematic review concluded that:
"..An increase in calcium intake slightly reduces both systolic and diastolic blood pressure in normotensive people, particularly in young people, suggesting a role in the prevention of hypertension. The effect across multiple prespecified subgroups and a possible dose response effect reinforce this conclusion. Even small reductions in blood pressure could have important health implications for reducing vascular disease. A 2 mmHg lower systolic blood pressure is predicted to produce about 10% lower stroke mortality and about 7% lower mortality from ischaemic heart disease.."