Do you mean "eating" literally or metaphorically? Because, if you mean it metaphorically, then that would make you a chimera. Chimerism (yes, that's a word, though I'm not sure if it's a "real" one) has caused unexpected problems in the past; people who had blood taken for sports or such were met with claims of forgery since the blood they was either a different blood type, or came from a person with a Y chromosome from a female donor, or a person without a Y chromosome from a male donor. It got even weirder when DNA testing came around. Turns out, it was from the "missing" twin's still living cells.
The freakiest thing is, you could be a chimera and not know it, unless you test some DNA from your blood to make sure it matches the rest of your DNA. Worse still, that would eliminate only really obvious cases, since it depends on how many of your "lost" twin's cells "made it" and where they are located. To be fair, in the vast majority of cases, chimerism occurs in the blood or the reproductive organs; However, unless you checked every single cell you couldn't be 100% certain you weren't a chimera, and even then natural mutations would make things even more complicated.
Sorry for the interruption! I just thought it was worth mentioning. Also, I love the responses! Please do keep it up, if you are so inclined. They are quite interesting!