Avocado may be good for you but environmentally it is horrendous. Destruction of farm land to grow high'water consuming avocado production (ie uses large quantities of fresh water), obviously density/weight means transportation emissions are high relative to other products (even when adjusted for nutritional content). Obviously caveated if you are close to avocado production but for those of us in Europe... that said, not sure I can admit to practicing what I am preaching here...