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> So I just fasted, and now I want to do intense cardio.... but I might run out of glycogen or blood sugar Isn’t that where ketosis comes in? Your body can bre

> So I just fasted, and now I want to do intense cardio.... but I might run out of glycogen or blood sugar Isn’t that where ketosis comes in? Your body can break down fat and provide energy through ketones. Some proponents of intermittent fasting would probably argue that simply not eating at certain times is the simplest diet of all since it doesn’t require continually evaluating at each meal what a “reasonable” level of intake is.

ngngngng 8y ago
It takes between 2-10 days to reach ketosis and switch from using carbs for energy to using ketones. Burning ketones also brings less energy than burning carbs, which would not be ideal for cardio.
- rhinoceraptor 8y ago
  There are studies on keto-adapted athletes doing cardio, from what I can tell there is no detrimental effect from a ketogenic diet after about a month of adaptation: https://www.sciencedirect.com/science/article/pii/0026049583901063 https://www.sciencedirect.com/science/article/pii/0026049583...
  - gremlinsinc 8y ago
    Thanks for this, I'm doing a modified fasting regime + keto + crossfit. I started at 515#, 5 weeks ago. I'm 485 now. I have a smaller stomach from surgery in 2012 but I only lost 150 pounds after surgery (650-500). I've been yo-yoing between 450/510'ish. My daily diet is basically a 8 carb protein shake with 60g protein around noon. Then the equivalent of 2 hamburger patties and 1/4 cup cheese for dinner. My calories rarely exceed 800 though. I feel great -- more energy than ever, and I have 0 hunger, I have to force myself to eat. I'm hoping this is maintainable and that I can keep the momentum up. My wife has a baby due in January (our 2nd), and I want to be able to do more with the family/kids and be around for them. Luckily I have no co-morbidalities, I just did a full physical -- everything is perfect # wise blood pressure, lipids, vitamins (except D deficiency). But, I'm 38, that could change. My heart could get stressed from the weight in a few years... I've been seeing a therapist for depression, and a doctor for ADHD, and now doing a good fitness regimen. Last year I was depressed with very dark thoughts, this year I feel great and in more control.
- guntars 8y ago
  You don’t have to be in ketosis to burn fat for energy. Ever notice how cardio gets harder about 45 minutes in but then gets easy and you can go on for hours? That’s your body running out of stored carbs and switching to burning fat reserves.
logfromblammo 8y ago
Fasting followed by cardio is a thing. It's called "bonk training". Running out of glycogen is the whole point of it. It supposedly helps your body make the switch from glucose and glycogen to body fat and ketones more smoothly. It might have been useful for triathletes and marathoners, if they weren't eating glycogen gel during their races now. You'd carbo-load, hit the wall at mile 20 or so, and just keep going at 80% your normal athletic capacity instead of 70%, because you trained for it. But now, you'd just be left in the dust by someone who has been sucking on a tube of glycogen gel and thus never hits the wall at all. I suppose it would still be useful for weight loss, if exercising while bonked wasn't self-torture.
gameswithgo 8y ago
you can't go as fast
deleted 8y ago
[deleted]

ngngngng 8y ago

It takes between 2-10 days to reach ketosis and switch from using carbs for energy to using ketones. Burning ketones also brings less energy than burning carbs, which would not be ideal for cardio.

rhinoceraptor 8y ago
There are studies on keto-adapted athletes doing cardio, from what I can tell there is no detrimental effect from a ketogenic diet after about a month of adaptation: https://www.sciencedirect.com/science/article/pii/0026049583901063 https://www.sciencedirect.com/science/article/pii/0026049583...
- gremlinsinc 8y ago
  Thanks for this, I'm doing a modified fasting regime + keto + crossfit. I started at 515#, 5 weeks ago. I'm 485 now. I have a smaller stomach from surgery in 2012 but I only lost 150 pounds after surgery (650-500). I've been yo-yoing between 450/510'ish. My daily diet is basically a 8 carb protein shake with 60g protein around noon. Then the equivalent of 2 hamburger patties and 1/4 cup cheese for dinner. My calories rarely exceed 800 though. I feel great -- more energy than ever, and I have 0 hunger, I have to force myself to eat. I'm hoping this is maintainable and that I can keep the momentum up. My wife has a baby due in January (our 2nd), and I want to be able to do more with the family/kids and be around for them. Luckily I have no co-morbidalities, I just did a full physical -- everything is perfect # wise blood pressure, lipids, vitamins (except D deficiency). But, I'm 38, that could change. My heart could get stressed from the weight in a few years... I've been seeing a therapist for depression, and a doctor for ADHD, and now doing a good fitness regimen. Last year I was depressed with very dark thoughts, this year I feel great and in more control.
guntars 8y ago
You don’t have to be in ketosis to burn fat for energy. Ever notice how cardio gets harder about 45 minutes in but then gets easy and you can go on for hours? That’s your body running out of stored carbs and switching to burning fat reserves.

logfromblammo 8y ago

Fasting followed by cardio is a thing. It's called "bonk training". Running out of glycogen is the whole point of it. It supposedly helps your body make the switch from glucose and glycogen to body fat and ketones more smoothly. It might have been useful for triathletes and marathoners, if they weren't eating glycogen gel during their races now. You'd carbo-load, hit the wall at mile 20 or so, and just keep going at 80% your normal athletic capacity instead of 70%, because you trained for it. But now, you'd just be left in the dust by someone who has been sucking on a tube of glycogen gel and thus never hits the wall at all. I suppose it would still be useful for weight loss, if exercising while bonked wasn't self-torture.

gameswithgo 8y ago

you can't go as fast

deleted 8y ago

[deleted]