Should be "You are what what you eat eats." Chaining more also works nicely: "You are what what what you eat eats eats," or, "You are what what what what what

Should be "You are what what you eat eats." Chaining more also works nicely: "You are what what what you eat eats eats," or, "You are what what what what what what you eat eats eats eats eats eats," and so on. All of which are true in some small proportion, of course.