Bernardo Houssay quotes:

The constancy of the blood sugar level is maintained by a complex physiological mechanism, a homeostatic mechanism of the same order as those which maintain the body temperature, the blood pressure or the heart rate at normal levels and control many other functions.

The production and consumption of glucose, and hence, the blood sugar level, are controlled by a functional endocrine equilibrium.

The nutritive substances used in greatest quantities by mammals are carbohydrates.