Calcium and Hypertension

Definition

Calcium is a mineral that plays a regulatory role in blood pressure control through vascular smooth muscle contraction and the renin-angiotensin system. Adequate calcium intake is associated with lower blood pressure.

How it works

Calcium regulates blood pressure through multiple pathways: it controls vascular smooth muscle contraction (affecting vasoconstriction and vasodilation), modulates the activity of the renin-angiotensin system, and influences sodium handling by the kidneys. Adequate calcium intake suppresses renin and angiotensin II secretion, reducing blood vessel constriction. Calcium interacts synergistically with potassium and magnesium to lower blood pressure; together, these minerals are central to the DASH diet's effectiveness. Low calcium intake is associated with higher blood pressure, particularly in hypertension-prone individuals, while adequate intake supports endothelial function and normal vascular tone.

Role

Calcium regulates vascular smooth muscle contraction and modulates the renin-angiotensin system to control blood pressure.

Examples

• Low-fat dairy products providing bioavailable calcium
• Fortified plant-based milks offering calcium alternatives
• Calcium supplementation reducing blood pressure in some individuals
• Low calcium diets increasing hypertension risk

Recommendations

Aim for 1,000-1,200 mg of calcium daily through food sources such as dairy products, leafy greens, fortified plant-based beverages, and fish with edible bones. Ensure adequate vitamin D intake to optimize calcium absorption. Combine calcium-rich foods with potassium and magnesium sources for maximum blood pressure benefit.

Key takeaway

Including adequate calcium-rich foods as part of a balanced diet contributes meaningfully to blood pressure control.

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