I lost 50lbs from eating less food and not exercising at all. I don't recommend not exercising. Its good for your health and makes you look and feel better whether you ride your bike or not, you have to listen to your bodies' hunger/fullness signals. When you ride your bike, you will be hungrier than when you do nothing and this your bodies' way of telling you how much "fuel" you need. I'd start by cutting your portions in half. Learn to stop before your plate is empty. Only eat when you are really truly hungry.

I could go on and on because my life was changed forever when I really "got" this. Let me know if you want more tips on eating less. I'd be happy to share.