Bear in mind that while vitamins and the essential amino acids and fats were all discovered over a hundred years ago, there has never been any sign of there being an essential carbohydrate. The minimum daily requirement for carbohydrate intake is, in fact, 0 (zero) grams. This is because the body is perfectly capable of manufacturing all the glucose it needs (a small amount, actually) from various sources.
By contrast, there are a number of essential amino acids required in our diet (somewhere between 10 and 30; I’m too lazy to look them all up right now) and two types of essential fats (ω-3 and ω-6 fatty acids). “Essential” here means simply that the body cannot manufacture these out of other materials. We don’t necessarily need vast quantities of them. Most amino acids used in the human body can be inter-converted, and so can most fatty acids.
Every cell in the body is capable of using glucose, but most of them are also able to metabolise fatty acids and ketone bodies. You will hear figures quoted for how much glucose the brain needs each day, but there is actually some doubt as to exactly how much it actually does need, especially when we have ketones available to feed it with.