Understanding what food is and does can prevent all food-dangers; nothing else can. Such knowledge makes clear what is said about food; nothing else does. As science has increased what is known, learning about living has become more complex, but it is also more interesting and of greater value to human life. The necessity to know how to live wholesomely has increased with modern civilization. Human development depends upon the life-supplies' being those human life itself demands for living, growing, working. Food-production needs to be of the provisions human living can flourish upon, and distribution such as will reach all humanity.

Saving by buying what will not nourish costs human health, efficiency, and sometimes life itself. Living requires what fosters life; this known, secured, and utilized builds up humanity by insuring to it health, growth, energy, capability. What is said about anything that is to be used to sustain human life must be tested by what it will actually do to humanity. Food has just one human use, that is, to nourish the body. What foods should be used is determined by their actual usefulness in the living-economy of the body itself: Nothing is saved by trying to use what does not do what the body needs to have done for it by food.

It is the complete utilization of the foods that are really nourishing which is the only saving that can be practiced with profit to human life. Desirable foods are not all equally expensive nor of the same expense at all seasons. Undesirable foods used to save time, effort, or money are the most expensive to life and working-power. Choose the foods of greatest use to the body and use these fully. This is true saving, and the only safe saving, as is not the endeavor to save that might lead to practices that deprive humanity of needed nourishment.