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Calcium & Magnesium: A Matter of Balance You experience the tensing (calcium) and relaxing (magnesium) interaction of these two elements each time your heart beats, when you feel your pulse, and every time you breathe. When we are under stress, our cells—which in their resting state contain magnesium—go through a change. Calcium, normally outside the cells, enters the cells and the calcium level becomes high. This is the action state in which a muscle cell, for example, will contract and tense the muscle. The magnesium then pushes the calcium out of the cell and the cell is again in its resting, relaxed state. Think of it as an on-off switch. The “off” is magnesium and the “on” is calcium. But what happens to a cell that is not in balance—where the magnesium level in the body is deficient? In simple terms, the “off” switch doesn’t fully turn off. That means calcium can continuously leak into the cells and stimulate cell activity (the “on” switch). The result is stress accompanied by one or more of the magnesium deficiency symptoms. Magnesium helps your muscles and nerves function properly; it keeps your heart rhythm steady, supports a healthy immune system and also assists in keeping your bones strong. This essential mineral helps regulate blood sugar levels, promotes normal blood pressure and is required for producing and storing energy. It’s easy to see why many researchers say that no single dietary factor is as critical as magnesium.