The mineral calcium, vitamin D and sunlight are integral to the formation of strong healthy bones. The three elements are interrelated as sunlight is one of the best sources of vitamin D.

Vitamin D in turn plays a major role in calcium absorption. It allows for calcium to leave the intestine and enter the bloodstream it also works in the kidney to help reabsorb calcium that would otherwise be excreted.

Recognising the importance of calcium and vitamin D many foods are fortified with them. Milk, considered to be a naturally good source of calcium is often fortified with vitamin D. Today many types of bread contain these nutrients. Most recently Tropicana orange juice has produced a version that is fortified with calcium.

The recommended daily dose of calcium varies with age. In Bermuda health authorities advise the following:

Recommended calcium intake

Daily dosage in milligrams

Birth to six months 210

six months to one year 270

one year to three years 500

four years to eight years 800

nine years to 13 years 1300

14 to 18 1300

19 to 30 1000

31 to 50 1000

51 to 70 1200

70+ 1200