Earnest Becker, in one of my favorite books. The answer to Nietzsche’s question is clear: yes, there are neuroses of health. The acquisitive and organizational urge run amok that defines consumerism, for example; or the preoccupation with a plastic aesthetic over the corporeal, with its attendant concealment of pores, sweat, hair, anything organic and unruly; or the obsession with cheeriness that makes self-esteem, a low sort of self-satisfaction, into a virtue without which one might as well be naked.
There are as many neuroses of health as there are neuroses of illness. What we must use, then, to define real mental illness, as opposed to simply characteristics that are socially undesirable, is this question: does the quality or behavior interfere with the individual’s ability to freely self-determine, to create himself as he wishes?