I had never heard of this idea before today. I was reading a report from the US Dept. of Agriculture about the health/poison effects of different types of sugars on bees. In the middle was this statement:
"Bailey also found that 8-year-old honey had dysenteric effects much like poisonous sugars: an absorption peak matching hydroxymethyl furfural correlated with toxicity of old honey and of acid-hydrolyzed syrups."
Has anyone else heard of this before?