Honey can't be eaten after 5 years, because the shelf life of honey is two years. Secondly, it should be noted that the moisture content of honey on the market is too high. After hot day fermentation, it will turn sour or alcoholic. At this time, it can no longer be eaten. It is easy to cause diarrhea or food poisoning. For honey with 100% purity, honey has no shelf life. If preserved properly, honey will not deteriorate easily.
Generally, the picked pure honey belongs to an aqueous sugar solution with very high concentration value, in which only a small amount of water is contained. Basically, when the concentration of a substance reaches a certain value, the plasma osmotic pressure inside the aqueous solution will be higher and higher.
Somatic cells cannot survive in high concentration aqueous solution. Because the aqueous solution with high plasma osmotic pressure will suck away the body water of somatic cells under the effect of plasma osmotic pressure, somatic cells will die after dehydration. Therefore, the vast majority of microbial strains cannot survive in pure honey, and pure honey without microbial strains cannot mildew.
Pure honey also contains glucose oxidase. When it reacts with glucose in it, it will cause a lot of hydrogen peroxide. Hydrogen peroxide has the effect of sterilization and disinfection, which improves a guarantee to prevent the growth of bacteria and the deterioration of honey.