A“mediterranean” type diet is higher in fat than is recommended, yet it is felt to be a heart healthy diet by the american heart association (aha) because the major oil in this diet is olive oil. what is the major fat in olive oil, canola oil, and peanut oil?

Mono-unsaturated fat

Explanation:

Monounsaturated fats are merely fat molecules with one unsaturated  carbon bond in the molecule, often called a double bond as well.

Oils containing these fats are usually fluid at ambient temperature,  but when cooled, they begin to become solid.

Olive, peanut and canola oil are instances of oil forms containing mono-unsaturated fats.