Popular birth control causes bone loss

Contributor

Almost half of all women who use a popular injected contraceptive lose a significant amount of bone mass within two years, and researchers now say the greatest risk is to smokers, women who don’t consume enough calcium and those who have never gone through a pregnancy.

A study that followed women who used the birth-control method — a shot of depot medroxyprogesterone acetate, better known as DMPA or Depo-Provera, every three months — found that 45 percent of the users experienced bone mineral density losses of 5 percent or more in the hip or lower spine, researchers said. The study appears in the January issue of Obstetrics & Gynecology.

Full story: Risks: Loss of Bone Mass Linked to Contraceptive