Originally Posted by Carbonfiberboy

You slightly misunderstand me. Yes, IF will result on lower calorie intake at least in the beginning, like any other form of calorie restriction dieting and with about the same long range outcomes. I was just saying that beyond that, there do not seem to be any more providential outcomes, or they don't show up in studies.

What I look for in my dietary practices is results on the bike. Can I go harder longer? I had one odd experience many years ago, when I did a very hard long ride on Saturday with my usual nutrition. Then I did a (ha, ha) recovery ride with friends on Sunday, about 60 miles at moderate intensity. I ate a small breakfast on Sunday. My muscle glycogen was fine as I was burning mostly fat, but I had a liver glycogen bonk. My head went blewy. I couldn't put two thoughts together. I stopped and did a couple hundred calories of liquid high GI carbs and was fine in a few minutes, no further problems. I always ate a good breakfast before a ride after that. Of course that wouldn't have happened on a 20 mile ride.

We only have about 400 calories of liver glycogen. Most of that gets used up to fuel our brains during the night. Our brains are a lot busier during sleep than people realize. All that dreaming burns a lot of calories. So that's where that "breakfast is your most important meal" comes from.
https://www.ncsf.org/blog/163-early-...-or-not-to-eat

Low-carbers who really do it and go ketogenic don't have an issue with glycogen depletion because their brains run on ketones rather than sugars. They also can't put out the power that burning carbs allows. There's a downside to everything.