Fructan Intolerance: Symptoms, Triggers, and the Low-FODMAP Solution

Fructans are a type of carbohydrate that some people struggle to digest. They belong to a group of small-chain sugars called FODMAPs, which can cause uncomfortable symptoms in sensitive individuals. Common sources include wheat, onions, and certain fruits and vegetables. Symptoms of fructan intolerance often include bloating, diarrhoea, gas, and stomach pain. Wheat and onions are the biggest contributors to fructan intake in the typical American diet. Other high-fructan foods include barley, rye, spelt, bananas, dates, grapefruit, nectarines, and many vegetables and nuts.

The only way to confirm a fructan intolerance is by following a low-FODMAP diet. This involves removing high-FODMAP foods and then slowly reintroducing them to identify triggers. Keeping a food log during this process can help pinpoint which foods cause symptoms.

A dietitian can provide guidance on managing the low-FODMAP diet while ensuring a balanced intake. Without a confirmed intolerance, there is no need to avoid fructan-rich foods unnecessarily. For those with suspected fructan intolerance, the low-FODMAP diet offers a clear method for diagnosis. By tracking reactions and reintroducing foods carefully, individuals can identify their triggers. Professional support helps maintain nutrition while avoiding unnecessary restrictions.