Eat the whole sandwich; without the bread. I know, then it ain't a sandwich, but you'll drop weight.
Seriously, my goal every day is zero carbs, zero sugar. I eat a lot, fat and protein. Some carbs through the vegetables I eat. Never hungry. Typical breakfast is four scrambled eggs with heavy cream and butter, 3-4 pieces of bacon. Dinner is steak, lobster tails, salmon, chicken, chopped sirloin with bacon and melted cheese slices with fresh green vegetables. 1-1/2 oz of tequila (or vodka), club soda and juice of fresh lime if I want a drink. There's stuff you can't have, but you'll never be hungry on this lifestyle.
After eating a footlong sub today, I thought the same thing Bill. I even said it to my co-worker. "You know if I stopped halfway, sure I would have been a little miffed but 5 minutes later I would have been fine" and I knew it.
Doesn't the human brain take a while to tell you that you're full anyway? That was one of my Dad's issues too. Both brothers. I'm guilty of it too. I'm working on it. Every time I walk by the mirror, I'm reminded that I'm mad to have gained this weight.
I watched West side story last night. Look at the difference in body mass in those days compared to now. It's crazy!