Which of the following factors may help enhance wound healing?

Proper hydration is crucial for enhancing wound healing because it facilitates various physiological processes essential for tissue repair. Adequate hydration helps maintain optimal blood circulation, ensuring that nutrients and oxygen are effectively delivered to the wound site. It also aids in the transportation of waste products away from the wound, which can otherwise impede the healing process.

Additionally, hydration supports the formation of new skin cells and promotes the maintenance of skin elasticity, both of which are vital in recovering from wounds. In contrast, the other factors listed negatively impact healing. Smoking reduces blood flow and oxygen delivery to tissues, a low protein diet undermines the body's ability to produce collagen and other essential components for healing, and excessive sun exposure can damage skin and exacerbate wounds. Therefore, maintaining proper hydration stands out as a key factor in promoting effective wound healing.