Fructose is a sugar found in fruit and honey and also in some processed foods and sweetened drinks like coke. It sounds harmless, but eating too much fructose can be damaging, particularly in conditions like ME/CFS, Long Covid and Fibromyalgia.
Unlike glucose, fructose is absorbed in the liver and the particular way it is metabolised leads to mitochondrial stress, fat accumulation, inflammation and reduced energy levels.