Are onions and garlic really that bad for IBS?

Asked by giggz · 1 day, 21 hours ago · 12 views

I was recently diagnosed with IBS-D and my dietitian mentioned something called low FODMAP. She said to avoid onions and garlic but these are in almost everything I cook. Are they really that problematic and is there any way around this?

giggz · 1 day, 11 hours ago

Onions & garlic are among the highest-FODMAP foods in existence. FODMAPs are fermentable carbohydrates that are poorly absorbed in the small intestine and rapidly fermented by bacteria in the colon, producing gas, bloating, and altered motility — which is the core driver of IBS symptoms. Specifically, onions and garlic are high in fructans — a type of FODMAP that is particularly potent for IBS-D (diarrhea-predominant) patients. Even small amounts can trigger symptoms in sensitive individuals because fructans are not dose-dependent in the way some other FODMAPs are. Here is the practical workaround your dietitian may not have mentioned: garlic-infused oil is safe for most IBS patients. The fructans in garlic are not oil-soluble, so infusing oil with garlic and removing the garlic pieces before cooking delivers the flavor without the FODMAP load. The same applies to the green tops of scallions (spring onions) — the green part is low FODMAP while the white bulb is high FODMAP. For onion flavor in cooking, asafoetida powder (hing) is a low-FODMAP spice that provides a very similar savory depth. Chives are also low FODMAP and work well as a finishing herb. The ACG 2024 guidelines note that the low-FODMAP diet is not meant to be permanent — the goal is elimination followed by systematic reintroduction to identify your specific triggers. Some IBS patients tolerate garlic in small cooked amounts while others react to trace quantities. Platelytix flags high-FODMAP foods automatically for IBS profiles.