Asparagus is high in fructans (inulin, oligofructose). Both asparagus and Brussel's sprouts are high in raffinose (an oligosaccharide). All these nutrients belong to soluble fiber, but they also all belong to FODMAPs (Fermentable Oligo-, Di-, Monosacharides and Polyols), which are problematic in fructose malabsorption. Those who have problems with both asparagus and Brussel's sprouts (and fructose, sucrose and polyols, like sorbitol) should consider testing for fructose malabsorption.
Soluble fiber is usually fermentable by colonic bacteria, which produce gas. Like said above, it may be a large quantity of soluble fiber that causes gas.
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I don't have IBS.
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Re: asparagus and brussels sprouts
