What is it?

Hereditary fructose intolerance is a rare metabolic genetic condition, caused by absence in an enzyme that helps to break down fruit sugar. People with this condition may suffer hypoglycemia due to indigestion of fruit sugar. The condition may vary in its severity and may be mild or very severe.

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Signs & symptoms

Symptoms may include poor feeding as a baby, irritability, jaundice, vomiting, convulsions, sleepiness, and fruit intolerance.


Diagnosis could be challenging and is based upon findings from medical history and physical examination. Further evaluation may include genetic testing.


Treatment includes elimination of fructose and sucrose from the diet, which is effective for most people.

☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.

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