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In nature, in our organism, but also in food, we encounter numerous chiral compounds. Usually only one of the possible stereoisomers occurs, often because only this one has the "correct" properties. Some examples are shown here: Ascorbic acid (vitamin C) is an essential food component, it is derived from glucose (grape sugar). Only one of the eight possible stereoisomers can be used in the organism. Depending on their origin, both occur in foods and can be used by the organism. For the sugar substitute sorbitol, the physical properties are of particular importance, but the substance should also taste sweet and not have any aftertaste and must of course not be harmful to health. Aspartame is made up of two amino acids. Only the dipeptide from the L-amino acids tastes sweet.