One simple diet rule

I've noticed a huge number of web ads lately for "one simple diet rule" for me to lose N pounds of stomach fat in M days (for various values of N and M). Now, of course I'm not ever going to click on any of these ads, and I hope nobody reading this would do so either. I imagine they will want $X money to reveal the simple rule. But my question is this: is there any way that this "one simple diet rule" is going to be anything other than "Eat Less Food, Dumbass!" ?