Because these true dietetic principles are so important, probably being the most valuable information given in this book, let us give them enough consideration to fix them in the mind. They should be a part of every child's education. They should be so thoroughly learned that they become second nature, for if they are observed disease is practically impossible. Accidents may happen, but no serious disease can develop and certainly none of a chronic nature if these rules are observed, provided the individual gives himself half a chance in other ways. When the eating is correct, it is difficult to fall into bad habits mentally. Correct eating is a powerful aid to health. Health tends to produce proper thinking, which in turn leads the individual to proper acting. _First, Eat only when there is hunger_: Hunger is of two kinds, normal and abnormal. The real or normal hunger was given us by nature to make us active enough to get food. If it were not for hunger, there would be no special incentive for the young to partake of nourishment and consequently many would die comfortably of starvation, perhaps enough to endanger the life of the race. Normal hunger asks for food, but no special kind of food. It is satisfied with anything that is clean and nourishing. It is strong enough to make a decided demand for food, but if there is no food to be had it will be satisfied for the time being with a glass of water and will cause no great inconvenience. Abnormal hunger is entirely different. It is a very insistent craving and if it is not satisfied it produces bodily discomfort, perhaps headache. The gnawing remains and gives the victim no rest. Very often it must be pampered. It calls for beefsteak, or toast and tea, or sweets, or some other special food. If not satisfied the results may be nervousness, weakness or headache or some other disagreeable symptom. When missing a meal or two brings discomfort, it is always a sign of a degenerating or degenerated body. A healthy person can go a day without food without any inconvenience. He feels a keen desire for food at meal times, but as soon as he has made up his mind that he is unable to get it or that he is not going to take any the hunger leaves. Normal hunger is a servant. Abnormal hunger is a hard master. A person in good condition does not get weak from missing a few meals. One in poor physical condition does, although this is more apparent than real. In the abnormal person a part of the food is used as nourishment, but on account of the poor working of the digestive organs, a part decomposes and this acts as an irritant or a stimulant. The greater the irritation the more food is demanded. The temporary stimulation is followed by depression and then the sufferer is wretched. This depression is relieved by more food. Please note that it is relieved, not cured. The relief is only temporary.