Honey Never Spoils

When archaeologists unsealed ancient Egyptian tombs, they discovered pots of honey, thousands of years old, that were still perfectly preserved and safe to eat. This incredible longevity isn't magic, but rather a unique combination of natural properties that make honey an extremely hostile (Review) environment for microbes. The secret lies in a three-part defense system created by the bees themselves during the honey-making process.

First, honey has a very low water content. Its high concentration of sugar makes it hygroscopic, meaning it actively draws moisture out of its surroundings. When a bacterium or yeast cell lands in honey, the substance essentially dehydrates it, killing the microbe before it can multiply. Secondly, honey is naturally acidic, with a pH between 3 and 4.5, which is inhospitable to most of the organisms that cause food to spoil.

Perhaps most remarkably, bees add an enzyme called glucose oxidase to the nectar. When honey is exposed to moisture, this enzyme slowly produces small amounts of hydrogen peroxide, the same antiseptic found in many medicine cabinets. This chemical barrier provides a final layer of protection. So while your honey may crystallize over time, this is simply a change in texture, not spoilage. A gentle warming will restore it to its liquid state, ready to enjoy.