Generally speaking, exceeding more than about 3500 calories burned in a given week is considered excessive. After that point, the health benefits of exercise decrease and the risk of injury increases.
Dr. Nash was writing about the symptom in anorectics, not bulimics, but I was intrigued by her readiness to quantify excessive exercise.
What do you think about this? Would you attach a different definition to "excessive exercise"? How much is too much to be considered normal?