Mystery Food #3!

Just when you thought I would not do it again - here it is! Mystery Food #3! I dare you to guess this time. This time the winner will get a prize. I promise.

Although I am a high fat food, I am filled with monounsaturated fat (aka “good fat”). Therefore, in small amounts, I actually decrease your risk of heart disease, high cholesterol and weight-gain. Almost everyone thinks I am a nut, but I’m totally sane, and in fact, I am a seed.

What am I?