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Life is metabolism. This means that all living organisms must breathe, drink, eat, and expel waste. This includes us!
These facts are so obvious, that we all tend to ignore them. That's what happened with me. In my quest for health, I looked into all sorts of esoteric sciences with panoplies of pills and potions, but I never looked in my pantry or refrigerator. Eventually, I realized that my hunger for healing, and thirst for knowledge, were just plain hunger and thirst.
Have you ever noticed that the more educated you become, the less common sense you have? This is the problem with most doctors. They're so pedantic and frantic with misery and mystery, that they forget about food and the metabolic imperatives of hunger and thirst. Ironically, many doctors have bad diets, and most hospital food is cheap and ugh!
We all need more common sense. Since life is metabolism, we should optimize our air, water, and food, by seeking clean air, pure water, and organic food. Also, we should avoid toxins and addictions, because they reduce metabolic efficiency, impair health, and cause sickness. In short, your hunger and thirst come first, but shun toxins and addictions.