Study shows cadmium link to reduced bone density

Women are being urged to eat a varied balanced diet to reduce their exposure to cadmium, after a major study linked the metal to reduced bone density.

Seventy seven WA women older than 50 were investigated, and their blood and urine was tested for the presence of 11 metals, as well as biomarkers of bone and kidney health.

Lead researcher Anna Callan said the most striking result from the study was that the more cadmium that was detected in the women’s urine, the lower their bone density.

“Even low-levels of cadmium present in urine was associated with lower bone density in the whole body as well as specifically in the hip and spine region, potentially increasing the risk of osteoporosis in post-menopausal women,” says Callan.

“Cadmium is found naturally in the soil at very low concentrations but we also know that certain agricultural and industrial practices can release more of the metal into the environment, which can lead to the presence of cadmium in the food chain.”

Fellow researcher and public health nutritionist Associate Professor Amanda Devine says because cadmium is present in so many foods, it is not possible to eliminate a particular food to limit exposure.

The researchers say the easiest way to avoid exposure to the metal is to consume a varied diet.

Prof Devine says eating low-fat dairy food provides calcium which promotes healthy bone growth.

Also, a diet rich in iron will reduce the amount of cadmium absorbed, she says.

“The relationship between iron intake and cadmium has been seen in international studies and also in some of our previous work.”

Callan says the study also revealed that blood zinc concentration was associated with reduced bone breakdown.

Blood zinc concentrations may be protective as they are associated with reduced bone breakdown, suggesting that a diet rich in zinc may also help to minimise the effects of cadmium exposure.

The study was published in the International Journal of Hygiene and Environmental Health.

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