Final answer:
The problem might be a deficiency of the enzyme fructokinase, leading to poor fructose absorption and a condition called essential fructosuria.
Step-by-step explanation:
If there is a lack of fructose absorption in the body but glucose and galactose absorption is fine, the problem might be a deficiency of the enzyme fructokinase.
Fructokinase is responsible for converting fructose into fructose-1-phosphate, which can then be broken down further into glucose. Without fructokinase, fructose cannot be metabolized, leading to poor absorption.
This condition is known as essential fructosuria and is usually harmless, as fructose is not an essential nutrient. However, excessive fructose consumption can result in symptoms such as bloating, abdominal pain, and diarrhea.