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Key Takeaways
- Sourdough bread contains peptides that might help lower blood pressure by relaxing blood vessels.
- The fermentation process in sourdough can make it healthier for your heart, but its effects on blood pressure are modest.
Naturally fermented sourdough bread may provide unique health perks, including better blood sugar control, improved mineral absorption, and support for gut health. Research shows it may even improve high blood pressure.
Why Eating Sourdough Might Support Blood Pressure
Sourdough bread is made through a natural fermentation process that uses yeasts and lactic acid bacteria. During this process, proteins in the flour are broken down into smaller compounds called peptides:
- Some studies suggest these peptides can help block angiotensin-converting enzyme (ACE), which causes blood vessels to narrow and blood pressure to rise. This is the same mechanism targeted by some blood pressure medications.
- Research has also found that sourdough bread, especially when made with certain strains of lactic acid bacteria, tends to have higher levels of these ACE-inhibitory peptides and a compound called GABA (gamma-aminobutyric acid) than regular bread. GABA is known to have a calming effect on the nervous system, which could contribute to lower blood pressure.
That means eating sourdough could help support healthier blood pressure.
But the effects may be small:
- One clinical study in people with metabolic syndrome found a modest reduction in diastolic blood pressure after two months of eating sourdough.
- Larger reviews of human studies echo this. While sourdough may support heart health generally, there’s still not enough consistent evidence to say it directly lowers blood pressure.
Fermentation Also Lowers Its Blood Sugar Effects
Sourdough’s fermentation process also lowers its glycemic index, meaning it causes a slower rise in blood sugar after eating. Keeping blood sugar levels steady can benefit cardiovascular health over time, especially for people with insulin resistance or metabolic syndrome.
Still, it’s important to keep expectations realistic. The effects of sourdough on blood pressure appear modest at best. It’s not a replacement for proven strategies. Instead, think of sourdough as a small, heart-friendly swap rather than a stand-alone fix.
Sourdough Has Different Benefits Than Other Breads
Not all bread is created equal. Conventional white bread is usually made with refined flour and commercial yeast, meaning it lacks the extended fermentation process that gives sourdough its nutritional edge. As a result, it contains fewer beneficial compounds and can cause a quicker spike in blood sugar:
- Whole wheat bread provides more fiber and nutrients than white bread, but doesn’t undergo the same fermentation that produces peptides and GABA.
- Sourdough’s natural acids and fermentation process also help make nutrients, such as magnesium, zinc, and iron, more bioavailable by reducing phytic acid, a compound that blocks mineral absorption.
- Sourdough is also easier to digest for many people. The slow fermentation breaks down some of the gluten and starch, making it gentler on the gut and less likely to cause bloating.
- Its lower glycemic response and better nutrient availability may indirectly support cardiovascular health, even if its direct blood pressure effects are modest.
Read the original article on Verywell Health
