My new portion size starting tomorrow!

So I have been watching shows of people trying to loose Weight and when they can't they get the lap band surgery! I'm not that severely over weight that I need to have the surgery, but I was thinking about it and all it is doing is making the stomach smaller, so that your not as hungry and you can't eat as much. So I decided today that I'm gonna do the same, but the hard way. I'm gonna control my own portion size by using this coffee mug. I'm not gonna eat more than fits in this cup level. At every meal. That's 4 deciliters exactly! Hopefully mixed with exercise I will drop some pounds. I hope I can do it and I hope it shows some results! I'll keep updates! Wish me luck!