Hi Bob,
I've only been on the carnivore diet for 5 or 6 weeks now, but I started intermittent fasting straight away.
Because I was primarily looking for wieght loss (not a lot, around 15 -20 lbs) I only have one meal a day at 5 - 6 pm and eat until I'm comfatably stuffed!
It worked for me as I lost 14lbs in the first 3-4 weeks and now I've plateaued out.
I intended to expand my options (and choice) by continuing with a keto diet when I reached my target weight but I feel so much better these days I've decided to continue with a fairly strict carnivore diet.