High sugar concentrations cause the bacterium to lose water by osmosis and it doesn’t have any cellular machinery to pump it back in against the osmotic gradient. Without enough water, the bacteria can’t grow or divide.

How does sugar stop bacterial growth?

Salt and sugar’s other antimicrobial mechanisms include interference with a microbe’s enzyme activity and weakening the molecular structure of its DNA. Sugar may also provide an indirect form of preservation by serving to accelerate accumulation of antimicrobial compounds from the growth of certain other organisms.

Will sugar kill bacteria?

The sugar technique used by Collins works by waking the bacteria up and making them eat. Sugar brings the bacteria back to life and allows them to take up antibiotics, which in turn, kill the bacteria.