I think food during rides is a bit overrated. I do indoor workouts and my recent 2hr workouts with 20-30min intervals at 90% ftp (ftp is 285) use about 1500 calories. I do those workouts with a cup of coffee and maybe 100 calories of something else solid and I’m good to go because I’m never that depleted since I eat the rest of the day. I can assure many recreational cyclists on this forum don’t expend as much. Given that our bodies carry a lot of stored glycogen, a lot of folks don’t need anything at all