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Ouch, it hurts me to read this. Try biking harder/longer so that you use up all your blood sugar and convert your metabolism from glycogen to ketones. Going o

Ouch, it hurts me to read this. Try biking harder/longer so that you use up all your blood sugar and convert your metabolism from glycogen to ketones. Going on an hour or longer run is part of my secret to extended fasting. Exercise-based switching of your metabolism makes the first and second day of fasting NOT suck so bad. So that's literally the opposite of your assumption, that the exercise makes you "need energy." If your like 99% of people, you already have plenty "energy" throughout your body. What are you actually experiencing? Blood sugar withdrawal. Your "need" for energy is actually a craving for the high glycemic ingredients in your food that cause physical addiction like symptoms, like feeling "hungry." And you may find it surprising that "hunger" isn't one of the things people experience on an extended fast when properly hydrated. Your "need" is easing the pain of withdrawal. Not anything to do with "energy." Edit: my SO informed me that there are some situations where woman benefit from certain foods after exercise for hormone regulation. But she also concurs that the evidence is pretty clear that men were built for intermittent fasting.

phonypc 5y ago
Maybe you're simplifying for the sake of brevity, but this notion of "use up all your blood sugar" and "switching" (as if binary) between glucose and ketones is pervasive and frustrating. That is not how things work. Unless you have some metabolic disorder, after your hour+ run your blood glucose is still going to be within, maybe on the low end of, the normal range. Even if you've completely depleted your liver of glycogen, which is unlikely for anything short of marathon distance unless you were already low. If your blood sugar was low (never mind gone) you'd be in serious trouble, dead before long if not rectified.

phonypc 5y ago

Maybe you're simplifying for the sake of brevity, but this notion of "use up all your blood sugar" and "switching" (as if binary) between glucose and ketones is pervasive and frustrating. That is not how things work. Unless you have some metabolic disorder, after your hour+ run your blood glucose is still going to be within, maybe on the low end of, the normal range. Even if you've completely depleted your liver of glycogen, which is unlikely for anything short of marathon distance unless you were already low. If your blood sugar was low (never mind gone) you'd be in serious trouble, dead before long if not rectified.