Somebody: Of course, there's another criterion, which is to say that we should combat disease according to a hedonic calculus, not because of some appeal to the norm. Thus, there are people, like Aubrey de Gray, who are seeking to extend human life and who see the "natural" process of death as not qualitatively distinct from dying from cardiovascular disease or from cancer. Similarly, there's the school of positive psychology that focuses on improving the quality of life, not merely treating mental illness.