Answer:
The usefulness of different lifestyle factors and mental states in maintaining our physical health.
Step-by-step explanation:
Generally, the introduction of health psychology has added different benefits to our knowledge of health and disease. It has helped us to understand the effects of our various lifestyles on our health. In addition, it enlightened us to the benefits and harmful effects of different mental states on physical health. It also shared more light on the factors that can help us to maintain healthy lifestyle.