Does it true ,that a few cells of organism are very needing in glucose?

 Yes, its  true, for example are red blood cells, a few cells of kidneys and epithelial cells, covering eyelids, in a base as glycolytic, as in theirs are not having mitochondrias as inside energy fabrics of cell and therefore theirs functioning depending on from glucose. And this is partially referring to the fast muscle tissues/where are fewer mitochondrias ,that in slow muscles, using in high intensively exercises, as hard athletic and sprinter run. But not in all these cases, when glucose splitting to lactate , in organism is choice  having:cells with mitochondrias are ability acidifying lactate till CO2 , water, or manufacture lactate back in glucose.

Importance to remember!If  human not using carbohydrates in an own ration, thus not means, that he is not having glucose deficit. Not depending ,as you are starving within a few weeks or keeping ketogenic   diet with  eating just meat, fats within month, level of glucose in blood will keep in norm limit, as in calm condition, as on physical loading -are researches for many times confirmed this. That it happens   ,that organism ability to synthesis all needing for him glucose from different gluconeogenic predecessors   in here limiting sleep of carbohydrates acidifying .  Thus,   process for synthesis is famous as gluconeogenesis/a manufacturing new glucose/, and organism receives needing original substances as minimum from 5 sources:

Amino acids ,  forming in muscles splitting ,  amino acids, forming in splitting of   meal s proteins, glycerine, which releasing in hydrolyses of triglycerides in fatty tissue or triglycerides in meal, lactate,  and pyruvate/molecules ,  forming in glucose metabolism in organism and ability again collecting for glucose recreated, forming in glycolyses.

 Acetone, forming in a spontaneously decomposing of acetone acetate.