A study of 600, 000 women by Canadian researchers has found that while bi-lateral breast surgery does reduce the chance of another episode of breast cancer the radical surgery doesn't appear to have a long-term impact on overall survival rates.

And as the world's fittest athletes are going for gold Norman investigates if being an Olympic athlete can be bad for your health.

Guest: Dr Norman Swan, host of What's That Rash? podcast and RN's The Health Report