Oh I hear ya! My peanut butter is usually gone by the next day of purchase. My low carb bars, are eaten by my roommate who isn't really following a low carb because they are sweet (grrrr!) I can't keep any sugar free ice pops, kids go right through them. Cheese? Forget it. cold cuts? Same thing.
The problem is that I prepare all my food ahead for the week which of course is fast food for the rest of the house. No matter how I complain it still happens. I'm going to buy a small fridge and pad lock it!