Which statement is true about essential fatty acids?

• A. Linoleic acid is essential
• B. Alpha-linolenic acid is essential
• C. Linoleic acid and alpha-linolenic acid are essential
• D. None of the above

Answer: (C)

Essential fatty acids are fats the body cannot make in sufficient amounts and must be supplied by the diet. In humans, linoleic acid (an omega-6) and alpha-linolenic acid (an omega-3) are the two essential fatty acids. They are needed for building cell membranes and for producing other important fatty acids and signaling molecules. Because both of these fats must come from food, the statement that linoleic acid and alpha-linolenic acid are essential is the correct one. While each of them alone is indeed essential, stating them together reflects the complete requirement. The body can convert small amounts of these into longer-chain derivatives, but the conversion is limited, underscoring the importance of including both in the diet.