Clincal research shows that about 50% of IBS suffers of any subtype have fructose malabsorption. If you have access to online research publication you might check the reference below. Table 2 gives the percentage of the population in each GI disorder that tested positive for fructose malabsorption. The results showed that 55% of IBS-C, 44% of IBS-D and 50% of IBS-A were tested positive for fructose malabsorption.
You probably know fructose intolerance is a genetic disorder usually detected in childhood which if not dealt with quickly can lead to very serious consequences. Consumption of HFCS does not precipitate fructose malabsorption; it only exacerbates it as do other food high in excess fructose such as honey.
Fructose malabsorption and lactose intolerance belong to a larger class of short chain carbohydrate malabsorption. This group of carbohydrates are referred to as FODMAPs (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols). Check the link in my signature for more information on FODMAPs.
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Fructose malabsorption belongs to a large class of carbohydrate malabsorption
