I've read somewhere that if there was only one single food a person could eat and nothing else, (not that that would be a good idea, just like if you were cursed and had to choose only one) then avocado is in the front running for the best candidate because it has more stuff you need in a single place than just about any other single food.

I've eaten 3 large avocados at once and felt totally fine, so I believe what you're saying.