If I record a high result for Inulin..

Inulin, FOS, and GOS – What’s the Difference?

When you’re working through your FoodMarble Challenges, you may come across terms like inulin, FOS, and GOS. These are all types of FODMAPs, but they aren’t the same thing. Here’s how they differ:

🌱 Inulin

• Inulin is a type of fructan, made up of long chains of fructose molecules.
• Commonly found in foods like chicory root, onions, garlic, and Jerusalem artichokes.
• Because the chains are longer, inulin often takes more time to ferment, which is why some people see a delayed rise in their breath readings during an Inulin Challenge.

🌱 FOS (Fructo-oligosaccharides)

• FOS are also fructans, but with much shorter chains of fructose molecules.
• Found in many of the same foods as inulin, but they ferment more quickly in the gut.
• Some people may tolerate FOS differently from inulin, since the fermentation pattern isn’t exactly the same.

🌱 GOS (Galacto-oligosaccharides)

• GOS are a different group of FODMAPs, made up of chains of galactose molecules.
• Found in foods like legumes (beans, lentils, chickpeas).
• Important: Inulin is not the same as GOS. Being sensitive to inulin doesn’t mean you’ll necessarily react to all GOS-containing foods.

✨ Why this matters

Everyone’s digestive system is unique. Some people may notice symptoms with inulin but tolerate FOS or GOS, while others react differently. By completing different Challenges, you’ll start to see patterns in your personal tolerances, which can guide you in choosing foods that work best for you.

If you have concerns or questions during your Challenges, our CX team is always here to help: hello@foodmarble.com or chat with us through the FoodMarble app.

Updated on: 06/10/2025