Besides diet and exercise, there is also the issue of social hygiene. Many people have become hardcore individualists. They do not even have a husband or a wife, let alone have meaningful interactions with other family members. You see, regular sex is not just a way of having fun. It is also something that contributes to your mental well being and assists in keeping you out of depressions and other mental issues. The same holds true for meaning-seeking spirituality such as in religion and meditation. It is one of the things that helps keeping you mentally healthy. For hardcore individualists and anti-spiritualists is their entire lifestyle that is in question.