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Disclaimer: This is all speculation based on anecdata from the internets. Noone really knows if/why IF helps. Its not exactly the same. One is caloric restrict

Disclaimer: This is all speculation based on anecdata from the internets. Noone really knows if/why IF helps. Its not exactly the same. One is caloric restriction, and the other is caloric exhaustion. If your entire body worked as a single unit it might be that simple, but: 1. IF helps cull gut-bacteria which can only survive on simple foods. e.g. Bacteria which are inefficient and would happily produce toxins because it knows with enough of its simple foods it can outlive other populations and its own toxins. 2. IF helps turn off the digestive system. When this happens your stomach will stop "growling", and you will feel energetic even tho you haven't eated food for 16+ hours. Allowing the digestive system to relax, and flush/hopefully clean itself up, and won't happen because you went for a run. 3. Senesent/Cancerous cells may still be starved by exhausting all calories quickly, but it really depends on how those cells die(it might just take time), and how the body allocates resources. You can imagine a tumor sitting on a major blood vessel will continue to eat before any muscles are. The only way to starve it is to not eat. All that said, exercise is always good. Just be careful. Try to do it in the first half rather than the second half of your fast. Fainting is never good.

logfromblammo 8y ago
Despite your concluding statement, there is something called "bonk training". Basically, you exhaust your glycogen stores as much as possible before beginning your workout. So when you start running/biking, your body is in a similar state to just after hitting the wall in a marathon or several hours into a long bike race or triathlon without eating. Since you have insufficient glycogen, you just can't do more than 70% your max heart rate. It is reputed to produce advantageous training adaptations when done in addition to normal training. But if you aren't on a keto diet already, that sounds like a great way to simulate the worst tortures of Hell. You probably won't even be able to push yourself hard enough to faint, but you will wish you had. There's a good reason racers down that glycogen gel stuff during their endurance races now.
- 738472527784 8y ago
  Anecdotally, I'd like to add that I run much better fasted than not. Granted I only run for 30 to 60 min, but even up to 36 hours fasting did not make it harder at all. I feel lighter, euphoric and my motivation does not change over the time running. Though, I speculate that running in the beginning of your fasting window will increase the time of glucose depletion and maaaybe make the fasting more efficient. Though, repairing exercise induced injuries probably won't be efficient.

logfromblammo 8y ago

Despite your concluding statement, there is something called "bonk training". Basically, you exhaust your glycogen stores as much as possible before beginning your workout. So when you start running/biking, your body is in a similar state to just after hitting the wall in a marathon or several hours into a long bike race or triathlon without eating. Since you have insufficient glycogen, you just can't do more than 70% your max heart rate. It is reputed to produce advantageous training adaptations when done in addition to normal training. But if you aren't on a keto diet already, that sounds like a great way to simulate the worst tortures of Hell. You probably won't even be able to push yourself hard enough to faint, but you will wish you had. There's a good reason racers down that glycogen gel stuff during their endurance races now.

738472527784 8y ago
Anecdotally, I'd like to add that I run much better fasted than not. Granted I only run for 30 to 60 min, but even up to 36 hours fasting did not make it harder at all. I feel lighter, euphoric and my motivation does not change over the time running. Though, I speculate that running in the beginning of your fasting window will increase the time of glucose depletion and maaaybe make the fasting more efficient. Though, repairing exercise induced injuries probably won't be efficient.