Which of the following foods is NOT a good source of essential fatty acids?

• A. Walnuts.
• B. Flaxseeds.
• C. Oily fish (e.g. salmon, sardines)
• D. Oranges.

Answer: (D)

Verified step by step guidance

1. Understand the concept of essential fatty acids: Essential fatty acids (EFAs) are types of fats that the body cannot produce on its own and must be obtained through the diet. The two main types are omega-3 and omega-6 fatty acids, which are found in foods like nuts, seeds, and oily fish.
2. Review the food options provided: Walnuts, flaxseeds, oily fish (e.g., salmon, sardines), and oranges. Consider which of these are known sources of essential fatty acids.
3. Analyze the nutritional composition of each food: Walnuts and flaxseeds are rich in alpha-linolenic acid (ALA), a type of omega-3 fatty acid. Oily fish are high in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are also omega-3 fatty acids.
4. Evaluate oranges: Oranges are primarily a source of carbohydrates, vitamin C, and other antioxidants. They do not contain significant amounts of essential fatty acids.
5. Conclude that oranges are NOT a good source of essential fatty acids, as they lack the omega-3 and omega-6 fatty acids found in the other options.