The fruit commonly associated with keeping the doctor away is the apple. This association originates from the old proverb, "An apple a day keeps the doctor away." This saying emphasizes the health benefits of apples, which are rich in vitamins, dietary fiber, and antioxidants. These nutrients contribute to various health advantages, such as improved heart health, better digestion, and potential reduction in the risk of chronic diseases. While it’s not a strict rule, incorporating apples into a balanced diet can promote overall health and well-being.