Symptoms – gas, bloating, pain and malabsorption of nutrients. If you eat more fructose than your small intestine can absorb, the excess fructose passes through to the large intestine.
In the large intestine, the fructose prevents the absorption of water, causing watery stools or diarrhoea, and preventing the absorption of nutrients like iron and zinc. (Supplements won’t absorb either.)
The displaced sugar in the large intestine also feeds the bacteria and yeasts that live there, producing hydrogen, carbon dioxide and methane. These gases create pressure in the large intestine, causing bloating, abdominal pain and flatulence.