Hazel Nunn, health information manager at Cancer Research UK, commented: "We know that vitamin D is essential for good bone health and while many studies have found a link with bowel cancer, we still can't be sure if vitamin D directly protects against this disease. This study adds to the evidence for vitamin D protecting against bowel cancer as well as many other diseases. We still need clinical trials to tell us if boosting levels of this important vitamin could help to prevent these conditions."

Ms Nunn advised: "The best way to get enough vitamin D is to enjoy the sun safely, taking care not to burn so as not to raise the risk of skin cancer. Eating plenty of oily fish as part of a healthy, balanced diet can help to maintain sufficient levels of vitamin D, particularly in people who don't get much sunlight. Anyone concerned they lack vitamin D should discuss taking supplements with their doctor."

Source: Cancer Research UK