The Stomach’s Function
The stomach plays a pivotal role in digestion, especially in breaking down proteins. The stomach is an acidic environment, with a pH that helps in protein breakdown and protects the body from harmful microbes. Gastric glands in the stomach release mucus to protect the stomach lining from the harsh acidic environment [07:36].
In the stomach, hydrochloric acid and pepsinogen combine to form pepsin, which is responsible for breaking down proteins into smaller peptides [07:58]. Hydrochloric acid also has the added function of being an antifungal and antibacterial agent, protecting the body from pathogens [08:33]. Additionally, the intrinsic factor is secreted in the stomach, which is necessary for the absorption of vitamin B12 in the small intestine [09:09].
As food is processed in the stomach, it is transformed into a semi-liquid substance known as “chyme” before moving on to the small intestine for further digestion and nutrient absorption [09:38].
Note: Drinking fluids with meals can weaken hydrochloric acid production, so it’s best to drink liquids between meals. The stomach requires approximately 3-4 hours to fully digest food before needing about an hour of rest to properly reset [10:16].
The Small Intestine and Nutrient Absorption
The small intestine is where most of the digestion and nutrient absorption occurs. The first section of the small intestine, the duodenum, receives enzymes from the gallbladder and pancreas, which help to break down food further.
Bile from the gallbladder plays a key role in breaking down long-chain fatty acids [13:23].
The pancreas releases several enzymes: pancreatic lipase (for fats), pancreatic amylase (for starches), and trypsin and chymotrypsin (for proteins) [13:53].
As food moves through the small intestine, the villi (tiny hair-like structures lining the intestine) and their “turf wall” of beneficial bacteria play a crucial role in the final stages of digestion and nutrient absorption [17:37]. These villi are essential for absorbing nutrients like vitamins, minerals, and other necessary compounds from digested food into the bloodstream.
