In some common phrases like, "You are what you eat", "Your actions reflect who you are". Is there a reason (besides it sounds funny) to not use, "You're what you eat", "Your actions reflect who you're"?
Nope! I notice that "you're" as a contraction for "you are" tends to only be used in front of verbals ("You're going out wearing that?") rather than just any old time "you" and "are" are next to each other.