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Actually, there is a wide variable area between health and disease. Only a few examples are necessary to illustrate the point: (1) It is physiologically normal for an individual to have a high blood sugar content 15 to 20 minutes after eating a meal. If, however, the sugar content remains elevated two hours later, this condition is abnormal and may be indicative of disease. (2) A “healthy” individual may have developed an allergy, perhaps during early childhood, to a single specific substance. If the person never again comes in contact with the antigen that causes the allergy, all other factors remaining normal, he or she will remain in that state of health. However, should the individual come in contact with that allergen again, even 20 or 30 years later, he or she may suffer anything from a mild allergic reaction—a simple rash—to severe anaphylactic shock, coma, or even death, depending upon the circumstances. Thus it can be seen that, unlike disease, which is frequently recognizable
