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19.0: Introduction

Last updated

Feb 13, 2025
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- 19: Gastrointestinal System and Disorders
- 19.1: Nutritional Disorders

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Person holding stomach with red coloring on stomach.

Figure 19.1 Gastrointestinal disorders can cause discomfort when left untreated. (credit: “Home remedies to get relief from stomach aches – 1” by News Fibers/Flickr, Public Domain)

The gastrointestinal (GI) system (also referred to as the digestive system) is responsible for several functions, including digestion, absorption, elimination, and immune response. It breaks down food and then absorbs nutrients into the bloodstream via the small intestine and large intestine. Because good health depends on good nutrition, any disorder affecting the functioning of the digestive system can significantly affect overall health and well-being and increase the risk of chronic health conditions. Nutrients from food and fluids are used by the body for growth, energy, and bodily processes. Essential nutrients must come from dietary intake. The carbohydrates, lipids, and proteins in foods are used for energy to power molecular, cellular, and organ system activities.

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