Calcium, vitamin D, and your bonesOsteoporosis - calcium; Osteoporosis - low bone density
Getting enough calcium and vitamin D in your diet can help maintain bone strength and lessen your risk of developing osteoporosis.
Bone Strength and Calcium
Your body needs calcium to keep your bones dense and strong. Low bone density can cause your bones to become brittle and fragile. These weak bones can break more easily, even without an obvious injury.
Vitamin D helps your body absorb calcium. Eat foods that provide the right amounts of calcium, vitamin D, and protein. This kind of diet will give your body the building blocks it needs to make and maintain strong bones.
In addition to getting enough calcium and vitamin D, you can reduce your risk of developing osteoporosis by exercising regularly and avoiding smoking and excessive alcohol use.
What does your body need to build strong bones?
C. Vitamin D
D. All of the above
How much calcium should adults under age 50 have each day?
A. 500 mg
B. 1,000 mg
C. 1,500 mg
D. 2,000 mg
Dairy products are the best source of calcium.
If you have lactose intolerance, you can't get enough calcium.
Dairy products are the only foods that are rich in calcium.
Which vegetable is not a good source of calcium?
D. Turnip greens
E. Bok choy
Which fish is a good source of calcium?
A. Fillet of sole
B. Grilled mahi mahi
C. Canned salmon or sardines
D. Fried fish nuggets
E. All of the above
You should cook vegetables thoroughly to make calcium easy to absorb.
Which snack is high in calcium?
B. Brazil nuts
C. Sunflower seeds
D. Tahini (sesame paste)
E. All of the above
It is difficult to get enough vitamin D from food sources alone.
How Much Calcium and Vitamin D do I Need?
Amounts of calcium are given in milligrams (mg), and vitamin D is given in international units (IU).
All children ages 9 to 18 should have:
- 1300 mg of calcium daily
- 600 IU of vitamin D daily
All adults under age 50 should have:
- 1000 mg of calcium daily
- 400 to 800 IU of vitamin D daily
Adults age 51 and older should have:
- Women: 1200 mg of calcium daily
- Men: 1000 mg of calcium daily
Men and women: 800 to 1000 IU of vitamin D daily. People who are vitamin D deficient or have insufficient amounts of vitamin D will need higher amounts of vitamin D supplementation.
Too much calcium or vitamin D can lead to problems such as an increased risk for kidney stones.
- Total calcium should not exceed 2000 mg per day
- Total vitamin D should not exceed 4000 IU per day
Calcium and Dairy Products
Milk and dairy products are the best sources of calcium. They contain a form of calcium that your body can absorb easily. Choose yogurts, cheeses, and buttermilk.
Adults should choose fat-free (skim) milk or low-fat (2% or 1%) milk, and other lower fat dairy products. Removing some of the fat does not lower the amount of calcium in a dairy product.
- Yogurt, most cheeses, and buttermilk come in fat-free or low-fat versions.
- Vitamin D helps your body use calcium, which is why vitamin D is often added to milk.
If you eat very few or no dairy products, you can find calcium in other foods. It is often added to orange juice, soy milk, tofu, ready-to-eat cereals, and breads. Check the labels on these foods for added calcium.
Other Sources of Calcium
Green leafy vegetables, such as broccoli, collards, kale, mustard greens, turnip greens, and bok choy (Chinese cabbage), are good sources of calcium.
Other good food sources of calcium are:
- Salmon and sardines that are canned with their bones (you can eat these soft bones)
- Almonds, Brazil nuts, sunflower seeds, tahini (sesame paste), and dried beans
- Blackstrap molasses
Other tips to make sure your body can use the calcium in your diet:
- Cook high-calcium vegetables in a small amount of water for the shortest possible time. They will retain more calcium this way.
- Be careful about what you eat with calcium-rich foods. Certain fibers, such as wheat bran and foods with oxalic acid (spinach and rhubarb), can prevent your body from absorbing calcium.
Your doctor may recommend a calcium or vitamin D supplement for the calcium and vitamin D you need. However, the balance between benefits and harms of these supplements is unclear.
Brown C. Vitamins, calcium, bone. In: Brown MJ, Sharma P, Mir FA, Bennett PN, eds. Clinical pharmacology. 12th ed. Philadelphia, PA: Elsevier; 2019:chap 39.
Cosman F, de Beur SJ, LeBoff MS, et al. Clinician's guide to prevention and treatment of osteoporosis. Osteoporos Int. 2014;25(10):2359-2381. PMID: 25182228 pubmed.ncbi.nlm.nih.gov/25182228/.
National Institutes of Health, Office of Dietary Supplements website. Fact sheet for health professionals: Calcium. ods.od.nih.gov/factsheets/Calcium-HealthProfessional. Updated March 26, 2020. Accessed July 17, 2020.
US Preventive Services Task Force; Grossman DC, Curry SJ, Owens DK, et al. Vitamin D, calcium, or combined supplementation for the primary prevention of fractures in community-dwelling adults: US Preventive Services Task Force recommendation statement. JAMA. 2018;319(15):1592-1599. PMID: 29677309 pubmed.ncbi.nlm.nih.gov/29677309/.
Calcium source - illustration
Osteoporosis - illustration
Osteoporosis - illustration
Vitamin D source - illustration
Vitamin D source
Calcium benefit - illustration
Review Date: 5/31/2020
Reviewed By: Diane M. Horowitz, MD, Rheumatology and Internal Medicine, Northwell Health, Great Neck, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.