The externality is increased public health care cost. Obesity leads to increased risks of heart attacks, diabetes, strokes, etc. And there’s a strong between po

The externality is increased public health care cost. Obesity leads to increased risks of heart attacks, diabetes, strokes, etc. And there’s a strong between poverty and obesity, making it more likely the public will pay the cost of treatment. There are other externalities as well; for example, we still haven’t really solved the problems created by all the plastic packaging used with processed foods.