We often tell kids to "eat their fruits," but for some children, an apple or pear leads to severe stomach pain. Fructose intolerance comes in two very different forms: one is a common digestive issue, and the other is a dangerous genetic disorder.
1. Fructose Malabsorption (Common)
What it is: The intestine cannot absorb fructose efficiently. It's like lactose intolerance, but for fruit sugar.
Symptoms:
- Gas and bloating (toddler's belly looks distended).
- Diarrhea ("toddler's diarrhea") often containing undigested food.
- Stomach pain shortly after drinking fruit juice or eating apples/pears.
The Trigger: Often caused by excessive juice consumption ("Apple Juice Malabsorption"). The body simply can't handle the load of sugar found in modern processed juices.
2. Hereditary Fructose Intolerance (HFI) (Rare & Serious)
What it is: A rare genetic defect where the liver lacks the enzyme Aldolase B needed to break down fructose.
Symptoms: These appear as soon as the baby starts solids (fruit/veg).
- Severe vomiting.
- Hypoglycemia (low blood sugar), shaking, seizures.
- Jaundice (yellowing of skin).
- Strong aversion to sweets (the child instinctively refuses fruit).
How to Manage (Malabsorption)
If your child has the common malabsorption type:
- Limit Juice: Water or milk should be the primary drinks.
- Choose "Safe" Fruits: Berries, bananas, and citrus are generally lower in excess fructose than apples, pears, and watermelon.
- Pair with Glucose: Fructose is absorbed better when eaten with glucose (e.g., eating fruit with a meal rather than alone).
Avoid Fructose Sources
When managing fructose malabsorption, reading labels is essential. AllergenFinder helps you identify fructose-containing ingredients on food labels—fruit concentrates, high-fructose corn syrup, inulin, or other sources you need to avoid—reducing mistakes when shopping for your child.
Try AllergenFinder