It's not uncommon at all.
http://wholehealthsource.blogspot.co...+malabsorptionFructose is a particular problem. In one study researchers fed fructose to 15 normal adults. They found that more than half of the 15 adults showed evidence of fructose malabsorption after just 25g of fructose, and greater than two-thirds showed malabsorption after 50g of fructose.
Now let's stop beating around the bush and get to the meat of this post. It's all summed up in a beautiful title: Fructose Intake at Current Levels in the United States May Cause Gastrointestinal Distress in Normal Adults. Dr. Richard W. McCallum et al. fed doses of isolated fructose to 15 normal adults. Can I say it any better than the abstract?