What statement best describes essential fatty acids?

• A. They cannot be synthesized by the body.
• B. They are necessary to form strong bones.
• C. They are the precursors of adipose cells.
• D. They must be digested before they can enter the bloodstream.

Answer: (A)

Essential fatty acids are fatty acids that the body cannot synthesize and therefore must come from the diet. This is why the statement that they cannot be synthesized by the body is the best description. They include fatty acids like linoleic and alpha-linolenic acids and are crucial for proper cell membrane function and the production of signaling molecules. The other ideas aren’t about why EFAs are essential: they aren’t specifically required just to form strong bones, they aren’t direct precursors of adipose cells, and while fats do need digestion to be absorbed, that’s a general property of dietary fats rather than what makes a fatty acid “essential.”