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Acid reflux is exactly what it sounds like, it's a backflow of acid and where it happens is in the stomach. The inside of the stomach is supposed to be very very acidic, with a pH of about one to three. It's an acid vat, it's by far the most acidic place in the body, and it can tolerate that because it secretes a thick layer of mucus on the inside of the stomach to protect the cells from the acid.

The pH of the stomach needs to be very acidic, with a pH of about one to three, in order to stimulate the production of pepsin, which is the digestive enzyme that breaks down protein. Without enough acid, the body can't stimulate pepsin and break down protein.

Apple cider vinegar, hydrochloric acid, and probiotics are some supplements that can help alleviate acid reflux symptoms. Apple cider vinegar can help lower the pH of the stomach, while hydrochloric acid can help stimulate the production of pepsin. Probiotics can help regulate the gut microbiome and improve digestion.

When people are stressed, they have more episodes of reflux. Stress can decrease the production of hydrochloric acid and digestive enzymes, and can also decrease the muscle tone of the lower esophageal sphincter, allowing more backflow of acid.

The autonomic nervous system has two branches, the sympathetic and the parasympathetic. The sympathetic is the fight or flight response, while the parasympathetic is the rest and digest response. When the sympathetic branch is dominant, it can decrease the production of hydrochloric acid and digestive enzymes, and can also decrease the muscle tone of the lower esophageal sphincter.