@alive, I have pretty much used intermittent fasting and eating less carbs to maintain my weight and the holidays do sometimes keep me challenged. I keep a similar eating schedule and use the free version of the Zero fasting app (https://zerolongevity.com/) to track my fasting time. I normally have a 16 to 18 hour fasting window and if I notice I've picked up a pound or two, I up my fasting window to 20 hours. There is another discussion you might find helpful:

-- Low-carb healthy fat living. Intermittent fasting. What’s your why?
https://connect.mayoclinic.org/discussion/low-carb-healthy-fat-living-intermittent-fasting-whats-your-why/