You can't avoid sugar, at least not the naturally found in fruit and vegetables.
Use in living organisms https://en.wikipedia.org/wiki/Carbohydrate
Monosaccharides are the major source of fuel for
metabolism, being used both as an energy source (
glucose being the most important in nature) and in
biosynthesis. When monosaccharides are not immediately needed by many cells they are often converted to more space-efficient forms, often
polysaccharides. In many animals, including humans, this storage form is
glycogen, especially in liver and muscle cells. In plants,
starch is used for the same purpose. The most abundant carbohydrate,
cellulose, is a structural component of the
cell wall of plants and many forms of algae.
Ribose is a component of
RNA.
Deoxyribose is a component of
DNA.
Lyxose is a component of lyxoflavin found in the human heart.
[20] Ribulose and
xylulose occur in the
pentose phosphate pathway.
Galactose, a component of milk sugar
lactose, is found in
galactolipids in
plant cell membranes and in
glycoproteins in many
tissues.
Mannose occurs in human metabolism, especially in the
glycosylation of certain proteins.
Fructose, or fruit sugar, is found in many plants and in humans, it is metabolized in the liver, absorbed directly into the intestines during
digestion, and found in
semen.
Trehalose, a major sugar of insects, is rapidly hydrolyzed into two glucose molecules to support continuous flight.
The concentrate ones taste artificial, and can very easily be recognised because of the different and specific taste.
The concentrate is only a powder, and in the past could have been found as a powder in small retail packages in the shops.
I am glad that these times are now only the past.
