I am just back from a 2 week vacation and experiment. I went to Greece and Croatia and decided that after almost 9 years of pretty much 100% keto, I would eat off plan for the whole 2 weeks and I did.
I did NOT eat sweets but everything else was fair game. I did fast from bed till afternoon frequently but not every day. It worked out really well in that I did not feel ill or lose my energy.
Now home and weight is up by 3 lbs. and ketones, believe it or not are 0.6 fasting blood ketones.
If I had attempted this in the first year of keto, I would have been sick (digestive issues) and likely would have lost all the benefits of keto. I can’t explain why I am still in ketosis. I tested the first morning back and again this morning. The day prior, I had eaten more carbs then all other days.
This is day 2 of back to keto and I am not experiencing any withdrawal symptoms. Keto eating is second nature to me and I have a ‘clean’ household but I am not tempted. I can only conclude that almost 9 years of clean eating has allowed my physiology to heal and somehow kept me able to maintain my ketosis.
Yipppppeeeeee!