Which ancient healing system is known for its focus on diet, natural therapies, and herbs?

The ancient healing system recognized for its emphasis on diet, natural therapies, and herbs is Ayuvedic medicine. This system, which has its origins in India, is rooted in the belief that health is a balance of body, mind, and spirit. It promotes a holistic approach to wellness by recommending dietary changes, herbal remedies, and lifestyle modifications tailored to the individual's constitution, or "dosha." Ayuvedic practices also include various therapies such as massage and yoga, further enhancing physical and mental well-being.

In contrast, homeopathy primarily focuses on the principle of "like cures like" and uses highly diluted substances for treatment rather than an emphasis on diet or herbs. Chiropractic is centered on the diagnosis and treatment of mechanical disorders of the musculoskeletal system, primarily through spinal manipulation. Reiki, on the other hand, is a form of energy healing that involves channeling energy to promote relaxation and healing, without a direct focus on diet or natural therapies. Thus, Ayuvedic's comprehensive approach to health through nutrition and natural methods clearly positions it as the correct answer.