Health is usually assumed as the natural state of humanity. In reality human health comes only by humanity's working with nature to keep the natural processes of physical living effectively active. To do this one must know what these are and what changes them. The use of such knowledge in living is health-nurture. Caring for life so it is wholesome and nourishing the body so it is well secure health to humanity.

Wholesome food and pure water and air; alternate rest and exercise; sanitary environment and hygienic habits; healthful clothing and housing; developing occupation and elevating recreation; human intercourse and community interests, - are all factors in producing enduring health. Proper adjustment of these to each other and for each person's needs is the problem of procuring health. Usually this is done without much consciousness that health demands attention. But if neglected, disastrous results ensue. No one is especially aware of health when he has it, but when gone it becomes one's chief concern. Time is saved and strength insured by making health-giving practices the habits of the body.

In order that there may be health, the supplies to the body - food, water, air - must be provided through informed intelligence. To learn what food is and does leads into learning how the body lives, and what it needs in order to live in health and grow into maturing power. Only thus can the person lead a developing and fully useful life.

Nature supplies heat, light, air, water, as it does food. But these all need adjustment to human life if they are to further rather than destroy it. Humanity survives by adjusting its environment to its needs. Freeing surroundings of ill influences and reenforcing all health-giving agencies make an environment of health-aids in which humanity can develop.