Really? How about this: there are NO essential carbohydrates.
Profound health benefits can be had by going into and staying in ketosis for extended periods of time.
It's all about running a deficit and maintaining sufficient stimulus to maintain muscle (no need to go as intensely as you do to build it), and sufficient protein to remain nitrogen positive.
The rest comes down to appetite control, and that's where fats can really shine. For some.
Some folks really do seem to feel more comfortable on lower fat, higher carbs. I'm not one of 'em, but you might be.
Either way is fine. Just pick one.
You may find that after staying in ketosis for a couple of weeks, you get to feel really good that way, and better able to flip back and forth between fuel sources.
Something to consider.
Okay, this is interesting.
And I have never heard of this before. Got anything I can read on this, Sassy?
It doesn't? Why not?
Calories in calories out.
Starvation mode takes a LOT longer than a couple of days of low carbs!
Meal Frequency and Energy Balance | BodyRecomposition - The Home of Lyle McDonald
I never, ever feel flaky on low carbs. I understand some do, but not everyone.
Where the way I have done it, is to go high on the high-carb days, and very low calorie on the low carb days, since low carb kills my appetite and high carb makes me hungry. I train and take advantage of the carbs on the high days, with more food, and manage a deficit through the low carb days.
Ultimately, if you run a deficit and maintain muscle, you'll drop fat. Pick your poison.
It is a very individual thing, to be sure. No one metric will fit everyone here.