Researchers have found that middle-aged men with bigger waist measurements have an increased risk of developing prostate cancer. They found that, for every extra ten centimetres a man had on his waist, his risk of developing the most aggressive form of prostate cancer was raised by 13 per cent. Early results suggest the increased risk is linked with the disruption to testosterone and other hormones that occurs with weight gain. This shows that middle-aged men can prevent the development of prostate cancer by eating a healthy diet and taking regular exercise.