Doctor: It would benefit public health if junk food were taxed. Not only in this country but in many other countries as well, the excessive proportion of junk food in people' s diets contributes to many common and serious health problems. If junk food were much more expensive than healthful food, people would be encouraged to make dietary changes that would reduce these problems.
The conclusion drawn in the doctor's argument is that taxing junk food would benefit public health.