Why can't you eat on your head?

Answer 1

Nothing to stop you! Go for it! Your body will still make the food go to the stomach.

Another Aspect:

Well, for starters, putting food on your head and then eating it would not be the best place to place/store your food. Unless you have great balance skills and a clean head.

If you mean, "Why can't I ever eat my head," then, the answer is simple. Your mouth is part of your face, which is technically part of your head. So, eating your head is impossible. Though, nothing is impossible, posing that it is possible to eat your head, though NOT recommended. Plus, there are countless choices out there, and choosing your head as your supper isn't the greatest choice for a sufficient, nutritious, and delicious meal. Lastly, your head (skull) "houses" your brain, the command central of all your knowledge. Eating your head (which, as we have previously discussed, may be possible), would mean you would not have a brain. Not having a brain means that you can not function. Though, asking such a question poses the notion that you may not have the largest knowledge one would wish for. Meaning, that eating your head (once again, as previously addressed, may be possible) would not cost you as much, as for say, it would cost Albert Einstein.