A gastroenterologist reveals the best bread for a flat stomach

A bloated stomach isn’t just uncomfortable—it can slow you down in everyday life and, for athletes, even cost them performance. While many of us instinctively reach for the classic white baguette or supermarket loaf, a leading gastroenterologist suggests that one type of bread in particular stands out for its impact on digestion, gut health and overall comfort: sourdough bread.

The bread that supports digestion

I once trained alongside a tennis player who always complained about feeling heavy and sluggish after his pre-match sandwiches. The culprit wasn’t the fillings, but the bread. After swapping his usual white loaf for sourdough, the difference was immediate—lighter stomach, fewer cramps, and no mid-match distractions.

Unlike industrial white bread, sourdough is made through a slow fermentation process involving natural yeasts and lactic acid bacteria. This process breaks down part of the gluten and fructans in wheat, which are often responsible for bloating and abdominal pain in sensitive individuals. Because of this, sourdough tends to be gentler on the digestive system without sacrificing flavour or texture.

Sourdough and the gut microbiome

What makes sourdough especially interesting is its effect on the microbiome—the community of good bacteria in our gut that plays a vital role in nutrient absorption and immunity. Thanks to its natural fermentation, sourdough contains probiotic compounds that help maintain balance in this ecosystem.

This translates into better digestion, fewer digestive upsets and even improved recovery after physical effort. The fermentation process also enriches the bread with vitamins like B vitamins, soluble fibre and beneficial acids that nourish intestinal bacteria. For athletes, this means reduced cramps, better nutrient uptake and the feeling of lightness even after a substantial meal.

Taste, variety and practicality

If the word “sourdough” makes you think of something overly tangy or heavy, think again. A well-made sourdough has a subtle flavour—slightly nutty, mildly acidic—that works beautifully in sandwiches, toast or even on its own with olive oil.

There’s also variety to suit every need: wholegrain sourdoughs are richer in fibre and keep you fuller for longer, while rye or spelt sourdoughs offer distinct tastes and textures. A wholemeal sourdough can be particularly effective for curbing mid-morning cravings, keeping energy levels stable without the crash that comes from refined bread.

A smart swap for everyday health

The simple act of replacing standard white bread with sourdough can make a real difference—not just for athletes, but for anyone seeking a flatter stomach and better digestive comfort. Beyond its nutritional profile, it helps regulate energy, supports gut health and offers a more satisfying eating experience.

So, next time you’re standing in front of the bakery counter, consider skipping the baguette and reaching for the sourdough. Your stomach—and your overall wellbeing—may thank you.