I'm not in anyway implying you have to give up sugar for the rest of forever. It's delicious and those who don't eat it are just sad. I know I could never give up ice cream. I am proposing two things.
1. Give up most of your added sugar. Normal peanut butter? No. Unless you're deathly allergic or something. An apple instead of that candy bar? Absolutely. Trust me, you will feel a million times better, and you will be getting the most out of the food you eat. No more empty calories.
2. Take one cheat meal a week. No, not a whole day. One meal. This I picked up from one of my moms handy little books by Bob (the guy from the biggest loser). I know my biggest problem is I have a rough day and go on an eating rampage, only to realize I shot my good diet and then give up on it all together. A treat every now and then is not the end of the world.