If you’re not in pain from not having a BM (bowel movement) each day, and your BMs look healthy I would try not to stress about it especially if you know you’re eating well.
When you’re fasting, you’re not eating as often so therefore will have BMs less often.
https://www.healthline.com/health/how-many-times-should-you-poop-a-day
If it’s still a major concern to you and you’re having difficulty passing BMs or they become an odd color, maybe it’s time to talk to your doctor about it. Good luck to you!
Fiber and eating plants/vegetables cause constipation. Most of your fecal matter is fiber and garbage that we cannot digest as well as waste produced by the bacteria that have to break down and ferment plants in your gut.
I personally eat only milk and beef/bacon/sausage and typically only #2 once every 2-3 days. I am also in and out in about two minutes.