This is a valid attempt to deal with conflicting stimuli from the world - to create standards to which you adhere consciously because you don't trust your intuitions to motivate you rationally in the environment with which you must interact. And really, such attention is partially what it means to be conscious/human - to audit your actions 'from the outside' instead of merely reacting. And with today's bizarre and skewed 'food environment', as it were, this becomes VERY necessary, especially for people with a predilection for analyzing their own behavior even in such supposedly mundane (but really fundamental) things as food consumption.