How does citric acid aid digestion in the gut?

It can stimulate the production of bile and other digestive juices

Many individuals consume lemon, often in warm water, with the expectation of improving their digestive efficiency, a benefit attributed largely to the presence of citric acid. This acid acts as a stimulant within the digestive tract. Upon entering the system, the citric acid encourages the body to increase its output of necessary digestive aids, specifically bile, which is crucial for fat emulsification, and other gastric juices required for breaking down ingested food. This heightened production helps the body process meals more effectively. While the accompanying hydration is also helpful, the acid itself primes the system for efficient digestion, potentially alleviating symptoms like mild indigestion.