Carbohydrates, proteins, and fats


  • Carbohydrates, proteins, and fats supply 90% of the dry weight of the diet and 100% of its energy. All three provide energy (measured in calories), but the amount of energy in 1 gram (1/28 ounce) differs:

    4 calories in a gram of carbohydrate or protein
    9 calories in a gram of fat

    These nutrients also differ in how quickly they supply energy. Carbohydrates are the quickest, and fats are the slowest.
    Carbohydrates, proteins, and fats are digested in the intestine, where they are broken down into their basic units:

    Carbohydrates into sugars
    Proteins into amino acids
    Fats into fatty acids and glycerol

    The body uses these basic units to build substances it needs for growth, maintenance, and activity (including other carbohydrates, proteins, and fats).


    Carbohydrates, proteins, and fats meaning & definition 1 of Carbohydrates, proteins, and fats.

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