In order to maintain life and health, human beings must take in food in addition to sunlight and air. The main ingredients of food are sugar, oil, protein, vitamins, inorganic salts and water, which are usually called nutrients. Together with oxygen that enters the human body through breathing, they are transformed into substances that constitute the human body and energy that sustains life activities through metabolic processes. Therefore, they are indispensable elements to maintain human body's material composition and physiological function, and also the material basis of life activities.
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