slimfast ketoIn fact, a 2012 British Medical Journal study of 36,000 postmenopausal women showed an 86% increase in the risk of heart attack in women taking calcium as a dietary supplement. [1] ! This risk increases further in those who do not take vitamin D supplementation. As I have often explained, the problem with calcium is that you are not in control of where it will be deposited. It can lodge in your bones, which is good. It can also be deposited in your soft tissues, especially arteries, causing calcification responsible for the increased risk of heart failure.