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Nutrition Basics

Intestinal Absorption

The passage of nutrients from the intestine into the bloodstream.

Definition

Intestinal absorption is the process by which digested nutrients cross the wall of the small intestine into the blood or lymph.

How it works

The small intestine is lined with villi and microvilli that multiply its absorption surface up to 250 m². Simple carbohydrates and amino acids enter the portal blood to the liver. Fats take the lymphatic route via chylomicrons. Certain nutrients require specific transporters.

Role

Ensuring the transfer of nutrients to the target cells of the body.

Examples

  • Glucose absorbed in 30-60 min
  • Fats via lymph in 2-4h
  • Vitamin B12 requires intrinsic factor

Recommendations

Maintaining the integrity of the intestinal mucosa through a diet rich in fiber and probiotics.

Key takeaway

A healthy intestinal mucosa is a condition sine qua non for good nutrient absorption.

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