Very well, I accept your point on illness. But a healthy lifestyle, as you have put it, does not hinge upon disease/non-disease. If this were an accurate description of health, then someone like myself who is happy and productive, yet has asthma, would not be healthy. Or perhaps any human who has cancer but still lives well - certainly their life is considered healthy?
I think health has more to do with one's relationship to one's life than the technicalities of illness. Would you disagree with this perspective?