Which of the following is classified as an omega-9 fatty acid?

Oleic acid is classified as an omega-9 fatty acid due to its structural characteristics. Omega-9 fatty acids are monounsaturated fats that have a double bond located at the ninth carbon atom from the methyl end of the fatty acid chain. Oleic acid, with the chemical structure of C18:1 (n-9), fits this definition as it has one double bond and is derived predominantly from sources such as olive oil, avocados, and nuts.

In general, omega-9 fatty acids are beneficial for heart health and have been shown to improve cholesterol levels. They play a role in regulating inflammation and are considered a healthy dietary fat.

The other fatty acids listed do not fall under the classification of omega-9. Palmitic acid and stearic acid are saturated fatty acids, which means they do not contain double bonds in their structure. Arachidonic acid is classified as an omega-6 fatty acid because its first double bond occurs on the sixth carbon from the methyl end. Thus, oleic acid stands out as the only omega-9 fatty acid in this group.