Fructose intolerance symptoms

Fructose intolerance is a condition that affects the body’s ability to properly digest fructose, a natural sugar found in fruits, honey, and certain vegetables. While it is often confused with other dietary intolerances, fructose intolerance has distinct characteristics and symptoms. Recognizing the fructose intolerance symptoms is crucial for those who suspect they may have this condition. Some supplements contain the enzyme Xylose Isomerase. These enzymes help to digest excessive fructose and help to reduce associated symptoms.*

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Common symptoms of fructose intolerance

The most prevalent signs of fructose intolerance occur within the digestive system. These include:

Bloating and gas: Fructose that isn’t absorbed properly ferments in the gut, leading to uncomfortable bloating and excessive gas.
Abdominal pain: Cramping or general discomfort is common after consuming foods high in fructose.
Diarrhea or constipation: The imbalance caused by unabsorbed fructose can disrupt normal bowel movements.
Nausea: Some individuals experience mild to severe nausea following fructose ingestion.

For adults, these symptoms can significantly impact quality of life. Recognizing fructose intolerance symptoms in adults can help identify triggers and guide dietary adjustments.

Hereditary fructose allergy symptoms

A more severe form of the condition, often referred to as hereditary fructose allergy, is actually hereditary fructose intolerance (HFI), a genetic disorder where the body lacks the enzyme aldolase B, which is essential for breaking down fructose. A common misconception is conflating hereditary fructose allergy symptoms with hereditary fructose intolerance symptoms. While the two terms are often used interchangeably, HFI is not an allergy but a metabolic disorder, and the symptoms—such as severe abdominal pain, vomiting, and hypoglycemia—stem from the body’s inability to properly process fructose.

If untreated, this condition can lead to liver and kidney damage. Diagnosing hereditary fructose intolerance symptoms requires medical evaluation and genetic testing.

Fructose allergy symptoms

Though not an allergy in the immune-system sense, some refer to fructose allergy symptoms to describe adverse reactions to fructose. These often mimic typical intolerance signs, such as gastrointestinal distress, but may also include fatigue and headaches.

Signs of too much fructose

Even for those without an intolerance, consuming excessive fructose can lead to discomfort. Too much fructose symptoms might include:

Fatigue due to blood sugar imbalances
Digestive upset
Weight gain over time due to fructose being stored as fat

Managing fructose intolerance

Understanding and managing signs of fructose intolerance starts with dietary adjustments. Key strategies include:

Seeking professional guidance: A dietitian can help tailor a diet that minimizes symptoms while ensuring nutritional balance.

Eliminating high-fructose foods: Fruits like apples, pears, and mangoes, as well as sweeteners like high-fructose corn syrup, should be avoided.

Supplementing with xylose isomerase: This enzyme helps convert fructose to glucose, making it easier for the body to absorb.*

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You can read more about the topic in our knowledge bank or you can contact one of our dieticians for personalized advice. If you’re facing symptoms and don’t know where they come from, you can take the intolerance test for more information:

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.