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cell (cell membrane) and is a hormone precursor. Finally, fats are solvents

that allow the complete absorption of fat-soluble vitamins (e. g.,

vitamin A, vitamin E) from the gastrointestinal tract.

Triglycerides constitute the major portion of the fats included in the

diet. These are neutral fats, each consisting of three fatty acids attached

to the trivalent alcohol glycerol. Among the more frequently encountered

fatty acids are palmitic, stearic, oleic, and linoleic acids. While

animal fats are predominantly saturated fatty acids (exception: salt

water fish), vegetable oils have a higher content of unsaturated fatty

acids (exception: coconut oil).

Carbohydrates

Carbohydrates are the preferred sources of energy of many organisms.