The role of yin-yang in Chinese medicine

Yin-yang is an abstract concept within ancient Chinese philosophy. It's the law of nature, the origin of motion and variation, and the principle of how humans perceive the world. But how does it fit in within the context of traditional Chinese medicine? And what about the food we eat? Lynn Hwang is a lecturer, clinical supervisor and clinical coordinator at the New Zealand School of Acupuncture and Traditional Chinese Medicine. She joins the show to explain.