The food acid does not "absorb more. Are required in an acidic environment of the stomach to allow enzymes (proteases) to do their work to the degradation of proteins.

When a person suffers from heartburn, or if too much acid in the stomach or, more likely, the acid in the stomach "Splash" in the lower esophagus.

Rolaids and other preparations based on alkaline to neutralize the acid, the peace 'in the stomach.