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Fat digestion and absorption: Normal physiology and pathophysiology of malabsorption, including diagnostic testing
Endashaw Omer1, Cristina Chiodi2
1Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, Kentucky, USA.
Proper fat digestion and absorption are vital for energy and nutrient uptake. This review covers normal fat processing, malabsorption causes, and diagnostic methods for gastrointestinal disorders.
Area of Science:
- Gastroenterology and Nutritional Science
- Physiology of Digestion
Background:
- Fat digestion and absorption are critical for energy homeostasis and physiological functions.
- Initial fat hydrolysis begins in the stomach, with primary digestion and absorption occurring in the small intestine.
- Dysfunctional fat absorption, or malabsorption, can lead to steatorrhea, malnutrition, and vitamin deficiencies.
Purpose of the Study:
- To review the normal physiologic processes of fat digestion and absorption.
- To discuss the pathophysiology of fat malabsorption.
- To outline current diagnostic testing modalities for fat malabsorption.
Main Methods:
- Literature review of physiological processes in fat digestion and absorption.
- Analysis of pathophysiological mechanisms leading to fat malabsorption.
- Compilation of diagnostic approaches for identifying the etiology of fat malabsorption.
Main Results:
- Detailed description of gastric and intestinal phases of fat digestion, including enzymatic actions and bile salt roles.
- Identification of various conditions causing fat malabsorption, such as exocrine pancreatic insufficiency and intestinal diseases.
- Overview of diagnostic tools including fecal fat analysis, imaging, and functional tests.
Conclusions:
- Effective fat digestion is essential for nutrient absorption, cellular function, and energy supply.
- Understanding the pathophysiology of fat malabsorption is key to diagnosis and management.
- Comprehensive diagnostic strategies are necessary to pinpoint the cause of fat malabsorption disorders.
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