Your stomach is extreme acidic not just to stimulate healthy digestion, but to also serve as your first line of defence against invading pathogens trying to hitch a ride into your intestines on the food you eat. Your stomach acid is meant to kill any parasites attempting to sneak in.
In a healthy digestive tract the stomach is the least populated organ, very little bacteria should be living in here. However, if you’re not producing enough stomach acid, (for whatever reason mentioned above, be it the overuse of antibiotics, poor diet, or stress) you become extremely vulnerable to parasites, food born illnesses, and SIBO (small intestinal bacterial overgrowth).
The under acidic environment allows opportunistic bacteria like Helicobacter pylori, Campylobacterpylori, Enterobacteria, Candida yeast, Salmonella, E.coli., and Streptococci to proliferate and dominate the stomach and gut lining. These pathogenic organisms play a role in causing stomach cancer, ulcers, and gastritis.
Many of these bad bacteria can also further stunt the production of your stomach acid by suppressing the function of the cells in the stomach that are involved in HCl production.
Normally the carbohydrates and sugars you eat would be digested and fermented in the intestines, but with these bacteria living in your stomach, they begin to prematurely ferment your food in the stomach. This causes unpleasant sensations such as gas, belching, burping, bloating, etc.
Not only that, but as these bacteria begin to breakdown the food in your stomach they create toxic byproducts like alcohol and acetaldehyde that rapidly get absorbed into your bloodstream through the stomach walls. This can cause experiences of brain fog, fatigue, and nausea.