Jejunum

Definition

Second part of the small intestine, approximately 2.5 meters long, responsible for the absorption of a large amount of nutrients and water.

How it works

The jejunum is highly specialized for nutrient absorption. Its walls are lined with villi and microvilli that greatly increase the absorption surface area. This is where digested carbohydrates, fats, and proteins pass into the bloodstream. Absorbed nutrients include amino acids, fatty acids, glucose, and fat-soluble vitamins. The jejunum represents about 40% of the total length of the small intestine but absorbs the majority of essential nutrients for the body.

Role

Majority of carbohydrate, protein, fat, and vitamin absorption for bodily assimilation.

Examples

• Glucose absorption from bread • Passage of amino acids from chicken into the blood • Assimilation of fatty acids from oil

Recommendations

Consume a variety of foods to maximize absorption of different nutrients. Maintain good intestinal health with fiber and prebiotics. Avoid highly processed foods that may complicate absorption.

Key takeaway

The jejunum is the main site of essential nutrient absorption.

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