Food provides you with nutrients and vitamins that energize your body to get through your day. Unfortunately, some people find that they feel tired after eating a meal. This can be a sign of a medical condition or food allergy -- see your doctor if you experience fatigue after you eat.

The human body encounters both good and bad bacteria daily. To microorganisms, the human body represents an attractive environment and source of nutrients. Bacteria that we call "good" helps us digest our food and protects us from bad bacteria that can make us sick or even kill us.

Whether the result of poor diet, inactivity or a chronic intestinal condition, gas can build up in your belly and make you feel bloated and uncomfortable. Gas pains can be sharp and stabbing or simply make you feel full, but either way they mean you may experience an embarrassing need to pass gas.

Abdominal pain is a common complaint. It could signal a benign illness or indicate a serious medical condition. The location, duration and associated symptoms of the pain are important in diagnosing its cause.

If the bowels are injured, inflamed or parts need to be removed due to cancer, a colostomy may be necessary. This procedure involves attaching one end of the intestines to the abdominal wall. Next, an opening is made in the abdominal wall and a colostomy bag is attached, allowing the stools to empty into it.

Diarrhea, the occurrence of loose watery stool, affects everyone periodically. Acute diarrhea describes a sudden onset that can occur due to viral infections, bacterial infections or parasites.

Everyone has diarrhea from time to time; it’s usually a sign of food poisoning, food allergies or the flu. Yet when babies get diarrhea, it’s more important to monitor it closely, as their immune systems are much weaker than those of adults.

The duodenum is a portion of the small intestine and is responsible for absorbing nutrients from partially digested food and passing along the remainder to the rest of the intestinal system.

Onions and bell peppers hold a flavorful presence in many everyday dishes, but they may be a trigger food for heartburn. To directly answer whether or not they cause heartburn, it truly depends on the individual.

The process of digestion is carried out through a number of organs in your digestive tract. The first stop is your stomach, which normally propels food into the small intestine to be digested. Sometimes your digestion will slow drastically or stop with food still left, undigested, in your stomach.

Diarrhea, or loose, watery stools, is a problem that sometimes happens during pregnancy; however, Baby Center notes that constipation is usually more of a problem. There are a number of reasons you could have diarrhea.

In addition to heartburn, acid reflux can cause pressure or tightness in the chest, with pain that can range from dull to excruciating. In some cases, these symptoms may be impossible to distinguish from those of a heart attack or cardiac chest pain, which is why evaluation by a doctor is so important.