Inside the cell, zinc sits as a bound ion in a whole range of enzymes whose active site loses its shape without this metal. Some of these enzymes take part in the reaction steps that let the cell process the carbohydrates it takes in.
As soon as the carbohydrates a person eats arrive inside the cell, they run through a sequence of small chemical conversion steps, in which one sugar molecule after another is turned into a series of phosphorylated intermediates. This chain depends on several enzymes, and some of them need a bound metal ion just to catalyze their particular reaction at all.
Along the way, these conversion steps also produce, in small amounts, a small and highly reactive compound with two neighboring carbonyl groups. It isn't a rare metabolic slip-up, but a regular, unavoidable companion of this conversion chain in practically every cell of the body — regardless of how carefully the reaction otherwise runs.
So that this compound doesn't build up over time, the cell keeps a two-step enzyme system on hand that continually breaks it back down again. The first of the two steps is carried out by an enzyme that carries a single zinc ion in its catalytic center — without this ion, the conversion slows down at exactly this point. The wording of the regulation doesn't name this enzyme; it limits itself to the general, documented contribution zinc makes to the normal course of carbohydrate metabolism overall.
For enough of this enzyme to stay occupied with zinc, the body needs an ongoing supply of the mineral through food — zinc isn't kept in the cell in large stored amounts.
The mechanism, a source table, and the complete wording of the claim on zinc and carbohydrate metabolism — available permanently as digital access.
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