According to a study carried out at Duke University, North Carolina, Calcium in dairy Products, can narrow blood vessels in the brain, causing dementia in the elderly.The study also showed that Vitamin D, which helps the body to use bone building calcium, can make it worse.

People between 60 and 80 years old who consumed most calcium and Vitamin D, were found to have more lesions, damaged brain tissue,than those with a smaller intake. age and blood presure did not affect the test results.

Lesions are often found in old people, but increased lesions can lead to a higher risk of stroke and dementia.Scientists said " They could be caused by bone-like calcium deposits, clogging blood vessels, making it harder for blood to reach the brain.

A growing number of researchers are becoming concerned about the effects of too much calcium given the emphasis on promoting high intakes.