There is no difference between suffering from fructose malabsorption and an IBS trigger. There is clinical evidence to show that many IBS suffers are also fructose malabsorbers.
One way to determine how much you can handle is to eat something with fructose in it. For example, if you eat a peppermint contain HFCS and it does it give you gas, bloating, cramping and/or D but two mints do then you know roughly how much fructose you can handle.
Personally I think that if you find you cannot handle HFCS then it is quite likely that you should avoid high fructose fruits. If you can handle HFCS then you likely won't have any problems with high fructose fruits.
AND of course you can always have a breath test to determine if you are a fructose malabsorber. I don't think the test is commonly available. Usually it is determined by a process of elimination.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS