Unless you have a health problem that requires you to avoid certain foods, I think you should just eat. Focus on what sits well in your stomach and digests well during a ride. Other than that, forget about everything else and just eat.
Chris Horner likes Snickers bars and Little Debbie brownies during rides. He's been quite successful over a long career as a pro. And he's always smiling.
Just eat what feels good for you.
Personally I have trouble with solid food on hot days, so I generally stick with gels and Gatorade. If I do eat solid food it needs to be very simple -- a tomato sandwich, a Nutri-Grain bar, a banana. Nothing more complex than that, or I'll feel sick. Not too much protein or fat, because that sits like lead in my stomach. But that's me.
I generally plan for ~300 calories per hour for rides longer than 90 minutes. I base that on recommendations from Nancy Clark's writings.
In the summer I make sure at least half the gels I consume are Power Gels because they have more sodium, and I've found that I feel better with more sodium when the weather is hot. Otherwise I like Gu vanilla gels because I prefer their taste and consistency. I alternate bottles of Gatorade with bottles of plain water. I also keep a couple of packages of Jelly Belly sports beans in my top tube bag because they're easy to eat while riding -- I can only eat the gels while I'm stopped. I will usually stop after every 15-20 miles of riding, which at my pace is 1-1.5 hours.
So before a ride I figure out how many gel packets and sports beans packets I will need given the number of miles I plan to ride, and then I add 1-3 more just to be safe, and I pack them in my seat bag/top tube bag/pockets so they will be ready during the ride.
I also aim to drink one bottle per hour. If I reach a rest stop and realize I haven't met that goal, I will drink extra at the stop to catch up.
But this is what works for me. Figure out what you like to eat and drink, plan for 200-300 calories per hour, and implement the plan. Plan rest stops at appropriate times or write reminders to eat and drink on your cue sheet if necessary. If you start to "fall apart," stop and eat something. Don't ignore it and keep riding for another hour or more.
Good luck.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles