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May 2001; Volume 4; S1-S2
Eight million American women and 2 million American men have osteoporosis. Another 18 million have low bone density, which increases their risk of osteoporosis. Although many Americans are aware of the role calcium plays in maintaining bone health, few receive recommended amounts of calcium from their diet. In recent years, our knowledge of the role of calcium in other diseases and conditions (e.g., colon cancer and premenstrual syndrome) has expanded, reinforcing the need for adequate calcium intakes.
Dietary Reference Intakes (DRI)
Dietary sources of calcium include dairy products, kale, broccoli, calcium-enriched citrus juices, mineral water, canned fish with bones, and tofu.
Mechanism of Action
Calcium Solubility, Bioavailability, and Absorption
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