I too, never feel hungry on a ride, but if riding over 90 minutes strange things start to happen. Just a little bit at first but it can rapidly become all out worn-out-pooped-out before you know it. It's no fun at all when you are miles from home or the car and your legs turn to jello. I've taught myself to carry an energy bar or snack. I really like the Clif bars, little bags of shelled and salted peanuts and have been experimenting with other stuff also. I tried GU gels and bought some Shot Blocs but haven't tried the Shot Blocs yet. I try to make myself eat a couple bites just over the hour mark if I know I'm going to be out on a long ride. I'll nibble a few bites over the course of the next half hour or 45 minutes. If I'm out longer than 2-2 1/2 hours I find that something other than water is necessary too.
Edited to add
I also tried a box of Detour energy bars from Costco on a recommendation, it's a variety pack but I don't really like them. They leave a chalky aftertaste. I'll use them up but will be sticking to Clif bars in the future, they have a more natural taste.