I'm out.
I would forget to do this. Plus I'd have to feel really guilty on days like today when I ate in airports. I ate four packages of pretzels on two flights, one of which was turned back to the start gate an hour into the flight after the plane got covered in ice. I also ate both a cookie and an apple fritter while my flight was rescheduled twice and my plane switched over once. I managed a bacon potato soup during those six hours too. I don't want to see those calories in black and white. As it stands, I still fit into my pants so it is all good.
But, I cheer you on.