Actually there is an analysis that says that the factor that keeps one fasted is the absence of carbs, not the absence of fats. However, for females who have not fully completed the climacteric - we have a profound biological wiring that throws us into starvation-mode fat storage rather quickly on behalf of the species - there is the argument that just a tiny bit of carbs (1 or 2 gms of half n half) added to the fatty coffee, helps the primal biology be successful at maintaining fat burning.
Also, IF with fats gives the digestive tract an enormous rest whilst feeding the brainās neurological work. This plays a role in not only reducing enzyme load and enhancing the restoration of natural enzyme balance - but helping folks show up to things that benefit from an awake brain - like driving moving vehicles, producing at jobs and communicating in relationships!
I have been implementing IF with fatty coffee and 2gms carbs the last month and have found it remarkable for addressing the mama-bear belly fat (irrelevant to poundage as I donāt believe in weight scales for myself on more than a quarterly or yearly basis).
Iām a night owl and still becoming keto-adapted I think, in month 5 and as a midlife person at age 51. I occasionally check my ketones with ketonix sticks before bed, in the wee hours of the morning. Consistently high - and undisturbed by modest wine w/dinner a few times a week. I tend to be convinced that the real action of ketones is seen in blood levels - weak ketonix sticks during the day may not mean ketones are inactivated or ālowā, they are at work in the physiology. This is apparently validated when one has the funds to get regular lab biomonitoring and medical overviews on progress, which is generally not covered by insurance (if one even has it).