3 ms·

I've been experimenting with fasting over the past couple of weeks. Yesterday I broke a 40-hour fast at lunch, then exercised around 6 hours later. I definite

I've been experimenting with fasting over the past couple of weeks. Yesterday I broke a 40-hour fast at lunch, then exercised around 6 hours later. I definitely didn't feel strong/energetic - but my numbers didn't actually suffer. That being said, it was a relatively short fast that started when I was glycogen-saturated. A longer fast that starts in ketosis might be different - which is what I'm planning to do next week (60 hours after 5 days of < 20g carbs).

jki275 8y ago
I think your numbers will go down on that one. You can get used to ketosis, many people do, but five days of it and then a fast is going to really suck.
- avinium 8y ago
  I honestly have no idea - you may be right. I'll report back next week.
  - jki275 8y ago
    I'll be interested to hear. I'm going to start a 14 day water fast in about two weeks, and plan to do some light workouts while doing it.
    - avinium 8y ago
      Just finished a 60 hour fast a few hours ago. 34/M/186cm/86kg. Last week was all keto, 4 weight training sessions and a 5km run on the first fasting day (Sunday, around 18 hours in). Run time was unaffected. First weights session post-fast will be tonight (i.e. after breaking the fast). The first 24 hours breezed by, but it started getting tough around hour 42. Note this wasn't hunger - I actually wasn't hungry at all. The problem was overall lethargy and feeling foggy/light-headed. I did bounce back after a few hours though, and although I felt very weak around hour 58, mentally I felt fine. Constantly felt very cold, too. I don't think the lethargy/weakness was due to dehydration (though drinking a lot of water on the second morning helped) or lack of sodium (was ingesting salt regularly). It could be lack of other minerals (potassium/magnesium). The worst is that it really interferes with my sleep. It takes me hours to get to sleep and then I wake up every couple of hours. I actually think I'm going to stop fasting for this very reason - it's not like I was doing this for weight loss, I was just experimenting to see how it felt. OMAD/IF will probably give me most of the health benefits of fasting without any of the drawbacks.

jki275 8y ago

I think your numbers will go down on that one. You can get used to ketosis, many people do, but five days of it and then a fast is going to really suck.

avinium 8y ago
I honestly have no idea - you may be right. I'll report back next week.
- jki275 8y ago
  I'll be interested to hear. I'm going to start a 14 day water fast in about two weeks, and plan to do some light workouts while doing it.
  - avinium 8y ago
    Just finished a 60 hour fast a few hours ago. 34/M/186cm/86kg. Last week was all keto, 4 weight training sessions and a 5km run on the first fasting day (Sunday, around 18 hours in). Run time was unaffected. First weights session post-fast will be tonight (i.e. after breaking the fast). The first 24 hours breezed by, but it started getting tough around hour 42. Note this wasn't hunger - I actually wasn't hungry at all. The problem was overall lethargy and feeling foggy/light-headed. I did bounce back after a few hours though, and although I felt very weak around hour 58, mentally I felt fine. Constantly felt very cold, too. I don't think the lethargy/weakness was due to dehydration (though drinking a lot of water on the second morning helped) or lack of sodium (was ingesting salt regularly). It could be lack of other minerals (potassium/magnesium). The worst is that it really interferes with my sleep. It takes me hours to get to sleep and then I wake up every couple of hours. I actually think I'm going to stop fasting for this very reason - it's not like I was doing this for weight loss, I was just experimenting to see how it felt. OMAD/IF will probably give me most of the health benefits of fasting without any of the drawbacks.