Final answer:
The best method of treatment for seasonal affective disorder (SAD) is light therapy (phototherapy), which involves sitting in front of a special lamp that emits bright light to regulate melatonin levels and improve mood.
Step-by-step explanation:
The best method of treatment for seasonal affective disorder (SAD) is light therapy (phototherapy). SAD is a mood disorder characterized by symptoms such as increased appetite, oversleeping, and lack of energy, which are often experienced during the winter months. Light therapy involves sitting in front of a special lamp that emits bright light, which helps regulate the body's melatonin levels and improves mood.