Which type of fatty acid must be consumed through diet and cannot be produced by the body?

The correct answer is essential fatty acids. These fatty acids are critical for various bodily functions but cannot be synthesized by the body, which means they must be obtained through the diet. The two primary essential fatty acids are omega-3 and omega-6 fatty acids, which play vital roles in maintaining cell membrane integrity, supporting immune function, and contributing to brain health.

In contrast, monounsaturated fatty acids, saturated fatty acids, and trans fatty acids can be produced by the body or do not have the same dietary necessity. Monounsaturated fatty acids are generally produced by the body and are abundant in olive oil and avocados. Saturated fatty acids can also be synthesized by the body from carbohydrates and proteins. Trans fatty acids, while often considered harmful to health, are primarily created through industrial processes and can also be synthesized in small amounts in the human body. Therefore, the unique characteristic of essential fatty acids as necessary components that must be included in the diet makes them the correct answer.