Jackson answered a battery of questions Tuesday about the president’s health after examining him Friday at Walter Reed National Military Medical Center in Bethesda, Maryland.
ABC News reporter Jonathan Karl asked Jackson, "Can you explain to me how a guy who eats McDonald’s and fried chicken and all the Diet Cokes and who never exercises is in as good of shape as you say he’s in?"
The doctor’s blunt answer to the question stunned the reporters in the room: "It’s called genetics. Some people have great genes."