Our bodies are not highly restrictive with respect to fuel requirements; they can use many assortments of carbohydrate, fat or protein and derive energy from each. Without the metabolic machinery to
transform this fuel, however, our bodies cannot function. In other words, calories are useful only if they can be metabolized.
Let us look carefully at just what nature does for us. Are there limitations? Or does nature spoonfeed us with the best possible of all foods?
The answers to these questions become clear when we look at different aspects of our environment. Does nature furnish us with a climate where the temperature day and night is always just right, where the wind always blows at just the right speed, where it rains only when rain is needed and the sunlight is always bright enough but never too bright? Obviously not. We move about, use clothing, shade, shelter, heat, light, ventilation and cooling, and in various ways adjust to the environment in which we find ourselves.
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