Ninety percent of nutrient absorption occurs in the small intestine, and most of the rest occurs in the proximal portion of the large intestine.

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Quizplus · Accepted Answer

This statement is true. The small intestine is where the majority of nutrient absorption takes place, and the large intestine mainly absorbs water and electrolytes. Specifically, about 90% of nutrient absorption takes place in the small intestine, with the duodenum (the first part of the small intestine) being the site of absorption of many important micronutrients such as iron and calcium. The proximal portion of the large intestine (mainly the cecum and ascending colon) can also absorb some water, electrolytes, and short-chain fatty acids produced by gut bacteria, but this comprises a small amount compared to the small intestine.

Ninety Percent of Nutrient Absorption Occurs in the Small Intestine