Physical inactivity is a common factor in lifestyle diseases — and one that is often linked to the excessive consumption of fatty and/or sugary foods. The opposite scenario of excessive physical activity at the expense of caloric intake can also be harmful, as cases of anorexia nervosa illustrate. These data therefore point to the crucial need to research the neurobiological processes that control the respective motivations for exercise and food intake.

Source: Go for a run or eat chocolate: A choice dictated by the cannabinoid receptors – ScienceDaily