INS and Hypertension: Furthermore, it has been suggested that the beneficial effect of dietary fiber on blood pressure is due to the enhancement of insulin sensitivity, which possibly improves endothelial function.53 Prior investigations showed dietary intake of Ca, but not Ca supplements, was inversely related with risk of hypertension.54,55 On the other hand, a meta-analysis of randomized controlled trials reported that Ca supplementation could reduce systolic and diastolic blood pressure.