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Related Concept Videos

Lipid Absorption01:24

Lipid Absorption

Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Synthesis of Phosphatidylcholine in the ER Membrane01:27

Synthesis of Phosphatidylcholine in the ER Membrane

The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
The major components of all eukaryotic cell...
Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Overview of Fatty Acid Metabolism01:28

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Mineral, Vitamin and Water Absorption01:27

Mineral, Vitamin and Water Absorption

Electrolytes are essential minerals and ions primarily obtained from the diet and absorbed through the gastrointestinal tract. Most electrolytes are absorbed in the small intestine. While the absorption of iron and calcium primarily occurs in the duodenum, calcium is also absorbed in the jejunum and ileum. In these regions, passive diffusion contributes to its absorption alongside active transport mechanisms in the duodenum. These ions can exit the enterocytes through specialized active...
Absorption of Nutrients01:19

Absorption of Nutrients

Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...

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Related Experiment Video

Updated: May 25, 2026

Long-Term Catheterization of the Intestinal Lymph Trunk and Collection of Lymph in Neonatal Pigs
06:25

Long-Term Catheterization of the Intestinal Lymph Trunk and Collection of Lymph in Neonatal Pigs

Published on: March 5, 2016

Dietary phospholipids and intestinal cholesterol absorption.

Jeffrey S Cohn1, Alvin Kamili, Elaine Wat

  • 1Nutrition and Metabolism Group, Heart Research Institute, 7 Eliza St. Newtown 2042 NSW, Sydney, Australia. cohnj@hri.org.au

Nutrients
|January 19, 2012
PubMed
Summary

Phospholipids (PLs) inhibit intestinal cholesterol absorption in cell and animal studies. Clinical evidence suggests dietary PL supplementation may also reduce cholesterol absorption in humans, but further research is needed for therapeutic confirmation.

Keywords:
cardiovascular diseasecholesterolintestinemicellephosphatidylcholinephosphatidylethanolaminephospholipidsphingomyelin

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The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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Using Caco-2 Cells to Study Lipid Transport by the Intestine
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Last Updated: May 25, 2026

Long-Term Catheterization of the Intestinal Lymph Trunk and Collection of Lymph in Neonatal Pigs
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Published on: March 5, 2016

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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Using Caco-2 Cells to Study Lipid Transport by the Intestine
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Using Caco-2 Cells to Study Lipid Transport by the Intestine

Published on: August 20, 2015

Area of Science:

  • Nutritional Science
  • Gastroenterology
  • Biochemistry

Background:

  • Phospholipids (PLs) are known to inhibit intestinal cholesterol absorption.
  • Evidence from animal and cell models is consistent.
  • Limited human data suggests a similar effect of dietary PL supplementation.

Purpose of the Study:

  • To review the evidence on phospholipids' effect on intestinal cholesterol absorption.
  • To explore proposed biological mechanisms.
  • To assess the potential therapeutic benefit of PLs in cholesterol management.

Main Methods:

  • Review of experimental studies in cultured cells.
  • Analysis of findings from experimental animal models.
  • Evaluation of limited clinical trial data in humans.

Main Results:

  • Consistent inhibition of cholesterol absorption by PLs observed in vitro and in vivo.
  • Preliminary clinical data supports a cholesterol-lowering effect of dietary PL supplementation in humans.
  • Several biological mechanisms for PL action in the gut lumen have been proposed.

Conclusions:

  • Phospholipids demonstrate a consistent ability to inhibit intestinal cholesterol absorption across various models.
  • Dietary PL supplementation shows potential for reducing cholesterol absorption in humans.
  • Further research is essential to confirm the therapeutic efficacy of phospholipids for cholesterol management.