If I had the power to renovate our health care system and ensure that certain issues were priorities to be accessed by all. These are where my priorities would lie, at least for now. It changes regularly.
Our physical environment shapes how we live. If we live near healthy, affordable foods we are more likely to eat those foods. If it's unsafe to walk and play outside, we are less likely to be involved in physical activity outdoors. These conditions impact how well we can execute healthy living.
Big bang for your buck. As we in the US move from acute disease as the major cause of death to chronic disease, we see a significant benefit in living healthy in terms of reducing our risk for chronic diseases. It is important to foster this behavior to help become healthier.
Big bang for the buck. You can potentially prevent a disease from even occurring and save lives (for example: In the US, ~20,000 people die each yr from the flu or flu complications, and the flu vaccine may help to prevent or reduce the severity of the flu).