Why we never heat honey

When honey is heated it undergoes a chemical change. Honey is primarily made up of fructose, and when it is heated the fructose creates a chemical called 5-hydroxymethylfurfural (handily abbreviated to HMF). We know a bit about HMF, because it is found in significant concentrations in High Fructose Corn Syrup, an ingredient you may be aware of in mass produced confectionery.