If you had to eat only three things for the rest of your life, what would they be?

...Brown Rice, Potatoes and Carrots. They're not too difficult to obtain and not terribly expensive. They also have decent enough nutritional value. As much as I love tangerines, they're not exactly a practical food to have around and they're not too easy to store.
If we're talking for long term, that list would probably end up looking more like a bunch of dried foods like Beans, Brown Rice (again) and Freeze-Dried Powdered Greens. Not exactly the most nutritious menu, but under the right conditions you can stockpile all three and it can last you for a very long time in situations where there is no consistent food supply. Not that I would want to eat those in a situation like that but if it's all there is, then that's how it would be.