Gastric juice itself has an acid pH. If you bring the pH to neutral or alkaline, that is, more than 6 – the digestion of proteins will already stop. The experience proving that gastric juice breaks down (digests) proteins only in an acidic environment consists in dissolving flakes of half-boiled chicken egg protein, with the addition of natural gastric juice.
Under the action of the enzyme of gastric juice – pepsin – protein molecules break down into simpler compounds, and pepsin acts only in an acidic environment, so the release of hydrochloric acid is a necessary condition for the digestion process.
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