Keto since March; at the end of that month, I began my first fast with water and supplements. That ended up being a 6 day fast and sold me on the practice. Since then, I’ve done a 72 hour, another 6 day, and almost a 5 day.
On Sunday I started a 5th fast. This one is intended to be the longest yet - two weeks or more if I feel good. However, my rule is always: I break the fast if I start feeling poorly. And this one is not starting as well as the others.
To be fair, I’m pretty sure I picked up a bug. Sore throat on Friday, very tired Friday through Monday. Been sleeping a lot.
HOWEVER… three other guys from work who sit near me also caught a bug - and they’re not only miserably tired, they also have runny noses and coughing. Worst I got was the sore throat (which ended quickly) and the tiredness (which hasn’t). I credit my better resistance to previous fasting - boosting my white blood cell count.
Now, I know I shouldn’t be doing a fast while I’m fighting something. Fasting is known to improve the immune system post-fast but it actually suppresses it during the fast. But I’m doing it anyway. I feel okay - it’s just a weak start. Tuesday I finally began to feel better - still tired, even today, but not as bad.
Why do I say it’s a weak start? Besides the tiredness, my blood ketone levels. 72 hours in and they remain stubbornly low (0.2 - 0.4).
This is not the pattern I’m used to. On other fasts, beginning around the 50-60 hour mark, I began to feel like I was in my twenties again, energy-wise (I’m 45). K levels rose at the same time.
Wanting to kickstart something, at 4:30, I took exogenous ketones. I seem to recall they should have an effect within an hour or so, though I could be wrong there. I recorded my blood K levels every hour:
4:30: 0.3 (pop the K-in-a-can)
6:30: 0.2 (hey, that’s the wrong direction!)
Well, pretty static still.
I love the energizing effect of a fast. Was looking forward to it kicking in today. Disappointing. Maybe tomorrow.