Don't eat anything that is advertised on TV. If an actor in a televised 30 second play convinced you to eat it, you probably shouldn't.
Apart from that, invest in good quality scales. When the numbers go up, change your behaviour until the numbers go back down again.
Oh, and quit making endless excuses in your head. They are just lies you tell yourself. If you really want to be healthier, than just go ahead and do it.