What Causes Gas and Bloating?
Gas and bloating are among the most common—and misunderstood—digestive complaints. While dozens of conditions can contribute, the vast majority of everyday bloating is driven by the foods we eat and how our bodies process them.
At the heart of the problem: fermentation. Certain carbohydrates, especially those classified as FODMAPs (Fermentable Oligo-, Di-, Mono-saccharides And Polyols), pass undigested into the colon, where gut bacteria feast and generate gas as a byproduct. This can stretch the gut wall, leading to the familiar tightness, fullness, and even visible distention many experience after meals.
- High-FODMAP foods top the list of gas boosters, but portion sizes and food combinations also matter.
- Underlying IBS, stress, and even meal timing can modulate your sensitivity to these foods.
- Each person’s “trouble foods” are unique—what bloats one person might pass unnoticed by another.
For the full FODMAP framework and a guided path to symptom control, explore our fodmap diet primer.