Does Too Little Calcium Equal Too Little Vitamin D?

Calcium is essential to the normal function of a number of the body’s most important systems. Without sufficient vitamin D, the body can’t absorb the dietary calcium it is given. Calcium deficiency does not always equal vitamin D deficiency, but the two can be closely linked.

Calcium

About 99 percent of the body’s calcium is found in its bones and teeth, but this important mineral is also present in the blood and fluid between the cells. Calcium balance in blood and extracellular fluid regulates muscle and blood vessel function, nerve impulse transmission and hormone release. If these levels drop, the parathyroid gland signals the body to release calcium from the bones into the blood. Over time, this may lead to decreased bone mass and even osteoporosis.

Vitamin D

Vitamin D enables calcium absorption and maintenance, cell growth, immune function and nerve impulse communication. It is also an anti-inflammatory. The body produces vitamin D naturally when the skin is exposed to sunlight. Due to the danger of skin damage from the sun’s ultraviolet rays, however, many people choose to obtain vitamin D from food sources or a supplement.

Vitamin D and Calcium Deficiency

Vitamin D helps the body form the hormone calcitriol, also known as the active form of vitamin D. This hormone is necessary for calcium absorption in the intestines. Vitamin D also regulates blood calcium concentration and enables bones to form osteoblasts, the cells that build bone, for healthy bone growth and repair. Vitamin D deficiency is only one potential factor in calcium deficiency. Other possible causes include parathyroid gland malfunction, kidney failure and alcoholism. See your doctor for diagnosis and treatment.

Getting More Vitamin D and Calcium

The best way to get calcium is through calcium-rich foods such as dairy products, tofu, leafy green vegetables, nuts and molasses. Dietary sources of vitamin D are limited to fatty fish and fish oil. The Institute of Medicine sets a recommended dietary allowance of 1,000 mg a day of calcium and 600 international units a day of vitamin D for most healthy adults. However, the right amount for you will depend on your age, health and other factors. Ask your doctor for a recommendation.