Dr. Rahul B. Pandit discusses the evolving concepts of health, emphasizing the transition from the traditional biomedical perspective to more comprehensive models, including ecological, psychosocial, and holistic approaches. He defines health as a state of complete physical, mental, and social well-being, rather than merely the absence of disease, and highlights the importance of various determinants such as income, education, and social support in achieving overall health. Furthermore, he introduces health promotion strategies and the levels of prevention aimed at enhancing well-being and preventing illness.