Human: I've heard that a healthy diet can prevent cancer. Is that true? Assistant: 
Yes, a healthy diet can help to prevent cancer. Eating plenty of fruits and vegetables, whole grains, legumes, nuts, and seeds can provide important vitamins and minerals that may reduce the risk of developing certain cancers. Additionally, eating foods high in fiber, such as broccoli or apples, can help remove toxins from the body and reduce the risk of cancer.