The Science
Barley is high in fiber (56% DV per 100g), which can be beneficial for some IBS subtypes (e.g., constipation-predominant) by promoting regularity, but for others (especially diarrhea-predominant or those with fructose/FODMAP sensitivity), high fiber, particularly insoluble fiber, can trigger bloating and cramping. The carbohydrate content (28% DV) also includes fermentable oligosaccharides (fructans) that are common IBS triggers, though the exact FODMAP load depends on serving size and preparation.
Recommendation
If you have IBS, start with a very small portion (e.g., 1-2 tablespoons cooked) and monitor symptoms, or consult a dietitian to determine if it fits your IBS subtype and FODMAP tolerance.