The bowels are the lower element of the digestive system. This hollow muscular tube goes from the stomach to the back passage. It processes all the food the individual consumes and breaks it down into nutrients for the organism. It even gets rid of any solid waste from the organism. The specialists divide the bowels into the small bowel (or small intestine) and the large bowel (colon and rectum).
What we eat can influence our well-being, weight, immunity, and skin condition. Understanding how this crucial part of the digestive system operates can help ease its workload and prevent stomach discomfort.
The small bowel
, measuring 7 meters, assumes a convoluted configuration in loose loops. Contrary to the expectation of a food-coated tube, its interior exhibits sleek, velvety, moist, pink walls that are impeccably clean. It is a little-known fact that only the terminal meter of the large intestine comes into contact with fecal matter, with the preceding section being clean and predominantly devoid of odor.
Some individuals may find the intricate structure of the small bowel disorderly. Yet microscopic examination reveals meticulously orchestrated folds and protrusions designed to maximize the absorptive surface area within a confined region.
These folds prevent the necessity for an 18-meter-long small intestine for digestion. Each square millimeter of the intestinal epithelium features approximately 30 distinct villi, which vigorously project into the ingested food mass, each bearing numerous microvilli branches. These microvilli, in turn, terminate in sugar structures resembling the antlers of deer, known as glycocalyx.
The final fragmentation of the food consumed takes place in the small bowel. Just behind the inlet (from the stomach), on its wall, there is a small hole, the so-called wart. It somewhat resembles the salivary glands in the mouth. This is how digestive juices reach the food mass. Thanks to them, large particles of proteins, fats, and carbohydrates are dissolved and can pass through the intestinal walls and enter the blood.
The bowels knead each portion of the pulp, spread in all directions, and penetrated by the movements of the villi. Intestinal movements are subordinated to one rule: keep going. They use a mechanism for this purpose (the peristaltic reflex).
In each intestinal villus, there is a tiny blood vessel powered by molecules taken from food. All the blood vessels in the small intestine connect and pass through the liver, which examines what we have eaten for the presence of harmful substances and toxins.
All the energy that powers our body's organs is obtained in the small bowel. However, you should not expect an injection of vitality immediately after the meal. At this point, many people feel tired and lethargic.
This is because more blood is directed to the digestive organs. As scientists point out, the brain then has less blood supply, so we feel tired. From the point of view of the intestines, they work better when we are lazy and relaxed and when stress hormones are not circulating in our blood.
About an hour after a meal, the intestines undergo a cleaning process known as the migrating motor complex. Some people mistake the resulting stomach rumbling for hunger, but it signifies the body's readiness to resume activity.
The most common diseases of the small intestine are:
When the small intestine meets the large intestine, there is an extra passage that may seem unnecessary (resembling an uninflated elongated balloon). It is the cecum, which culminates with the appendix. Its job is to search for foreign bacteria in leftover food and neutralize them if needed.
It also serves as a storage place for carefully selected beneficial bacteria that can be utilized, for instance, during sudden bouts of diarrhea.
The large intestine is like a string of corals, fitting snugly around the small intestine, similar to a thick picture frame. Its role is to process what the small bowel couldn't absorb, with a microworld of intestinal bacteria breaking down the remaining food. The immune system is particularly interested in these bacteria, found on the intestinal walls and in the appendix, which is almost entirely composed of immune lymphatic tissue.
After the small intestine has absorbed a meal, the large intestine diligently processes the leftovers for about 16 hours. In the final meter of the digestive tract, precise measurements of water and salt excretion occur, helping the body conserve around a liter of fluids daily. If it weren't for the large intestine, we would need to consume an additional liter of fluids each day.
The most common diseases of the large intestine are:
The human digestive tract houses bacteria, viruses, and fungi. Collectively, these microorganisms are referred to as the human microbiota. The gut-dwelling microorganisms aid digestion, detoxification, and the immune system's protective barrier fortification. They also facilitate the fermentation of certain nutrients and the synthesis of essential vitamins such as biotin, vitamin K, and short-chain fatty acids. Moreover, the microbiota promotes the absorption of calcium and iron and helps maintain the appropriate pH in the digestive tract.
Interestingly, while one-third of the gut bacteria are common among all individuals, the remaining two-thirds are unique to each person. Despite this uniqueness, distinct enterotypes have been identified and categorized by the prevailing bacteria types. These enterotypes have individual bacterial families with specific characteristics, such as dietary preferences, compatibility with other bacteria, and the production of enzymes or vitamins.
Sensitive bowels do not like fast food, which contains sugar, yeast, coffee, oranges, pork, and corn, as well as synthetic food additives (preservatives, dyes, stabilizers, and flavor enhancers). Fresh vegetables, fruits, and whole grain products nourish the intestinal microflora.
A significant role in the intestinal diet is played by the so-called probiotics that contain groups of lactic acid bacteria (Bifidobacterium, Lactobacillus). We can find them in:
The second group of products significant in the intestinal diet is prebiotics (they contain fiber, mainly water-soluble), which help the growth of intestinal bacteria. The following influence positively on intestinal function:
It is essential to realize that drugs, primarily antibiotics, but also antidepressants and sleeping pills, hurt the intestinal microflora. The damage they cause has side effects for months or even years.
A varied diet rich in natural food products is significant for the health of the bowels, as is how it is consumed. Food should be eaten slowly and chewed carefully, and stressful situations while eating, which cause swallowing air and gas formation, should be avoided. Calm breathing and regular physical activity are also necessary for healthy bowel-like movements.
You must also drink adequate amounts of water (at least 1.5 liters a day). Mineral water can be consumed alone or replaced with herbal infusions or bitter tea.
The frequency and quality of bowel movements can determine much. Various types of tests are also available.
Imaging tests, i.e., computed tomography, X-ray (with or without contrast), abdominal ultrasound. This type of examination helps to detect, for example, defects, excesses, and diverticula, i.e., bulges of the large intestine, which may cause inflammation or even a fistula.
Gastroscopy allows you to view the initial section of the small intestine – the duodenum- and the stomach and esophagus.
Colonoscopy enables a comprehensive analysis of the final section of the small intestine and the entire large intestine for the appearance of polyps or other pathological changes (including cancer). It is performed using a colonoscope – a long flexible tube with a camera attached, inserted through the rectum into the large intestine.
Hydrogen tests are performed to confirm or exclude gastrointestinal ailments and those related to nutritional intolerance (lactose, fructose) and small intestinal bacterial overgrowth (SIBO). The first (comparison) measurement is performed on an empty stomach, and the next one, at regular intervals, after administering a standard dose of lactose to the patient. The test confirms intolerance if the hydrogen concentration in the exhaled air increases above a certain level.
Stool examination helps detect the presence of occult blood, which indicates pathological changes (e.g., hemorrhoids, polyps, cancer) in the large intestine.
Many factors influence the digestion process through peristalsis. Usually, we are dealing with either a slowing down of the bowel (sometimes called a “lazy intestine” and leading to constipation) or an acceleration (which ends in diarrhea). The most common causes of gastrointestinal motility disorders are:
According to some calculations, each person who eats unhealthy food and has irregular bowel movements may have up to 15 kg of fecal impaction in the intestines (although on average, it is assumed that each person has about 5 kg). Fecal impaction in the intestines leads to the deposition of harmful toxins and may cause various symptoms, including:
Several factors influence regularity in bowel movements. It is crucial to ensure you drink an adequate amount of water (at least 1.5-2 liters per day), maintain a fiber-rich diet, support healthy gut bacteria, and have regular meals (ideally five moderately sized meals).
Fiber, which includes cellulose, lignans, and hemicellulose, plays a vital role in eliminating waste from the body. These components act as natural cleaners in the intestines, aiding in the expulsion of waste materials.
Large amounts of natural fiber can be found in:
Dried fruits are also a rich source of fiber, which ideally improves the cleansing of intestinal deposits. It is especially worth reaching for figs, plums, and dates. The diet should also include kefir, sour milk, high school yogurts (they must not contain sugar), and pickled vegetables because they improve the bowel's bacterial microflora.
It is also significant how the dishes are prepared. When cleansing the intestines of fecal impaction, raw vegetables and fruits are best; pasta should be cooked al dente, and groats and dark rice should be cooked loosely. Avoid fried and grilled foods.
Table of Contents
Ileus is a medical condition that stops the passage of food through the digestive tract. What are its symptoms and… read more »
SIBO is a syndrome of symptoms that occurs when there are too many bacteria in the small intestine. The causes… read more »
The colon is part of the large intestine and is essential for the digestive system. Some signs may indicate problems… read more »
A stoma is a surgically created opening that leads urine or faeces outwards. The procedure of placing a stoma is… read more »
Flatulence is the excessive accumulation and release of gases. See what are the causes of this condition. What to do… read more »
Ulcerative colitis is a chronic inflammatory disease of the large intestine, often manifested by diarrhea with blood. Here is everything… read more »
C. Diff is the abbreviated name for the bacteria that causes infections in the gut. It causes diarrhea and other… read more »
The duodenum is an important organ with useful functions. Find out how to recognize duodenal problems that herald disease. Learn… read more »
A bloated stomach is a condition characterized by a feeling of fullness, tightness, or swelling in the abdomen. What are… read more »
