Approximately what percentage of nutrients is absorbed in the proximal 100 cm of the small bowel?

In the proximal 100 cm of the small intestine, a significant amount of nutrient absorption occurs, primarily due to the presence of specialized structures such as villi and microvilli that increase the surface area for absorption. This portion of the small bowel is responsible for the uptake of vital nutrients, including carbohydrates, proteins, and fats, as well as vitamins and minerals.

Research indicates that approximately 80% of total nutrient absorption takes place within this initial segment of the small intestine. This high percentage emphasizes the crucial role that the proximal small bowel plays in nutritional physiology and underscores the potential consequences of any resection or impairment in this area, which can lead to malabsorption syndromes. The 80% figure is widely recognized in clinical and educational contexts related to gastrointestinal physiology and ostomy care, making it the correct choice in this scenario.