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Related Concept Videos

Glucose Transporters01:27

Glucose Transporters

Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
Overview of Carbohydrate Metabolism01:19

Overview of Carbohydrate Metabolism

Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
Carbohydrate Absorption01:25

Carbohydrate Absorption

Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...
Hyperglycemia01:29

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...

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Related Experiment Video

Updated: Jun 9, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
08:42

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport

Published on: November 27, 2016

Fructose malabsorption: true condition or a variance from normality.

Moe Htet Kyaw1, John Francis Mayberry

  • 1Digestive Diseases Centre, Leiceter Royal Infirmary Square, Leicester, UK. moehkyaw@hotmail.com

Journal of Clinical Gastroenterology
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

Fructose malabsorption, a potential cause of irritable bowel syndrome symptoms, remains poorly understood. Diagnosis is challenging due to unclear breath test cutoffs and normal fructose absorption variability.

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Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis
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Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis

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Related Experiment Videos

Last Updated: Jun 9, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
08:42

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport

Published on: November 27, 2016

Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis
06:26

Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis

Published on: July 18, 2025

Area of Science:

  • Gastroenterology
  • Human Nutrition

Background:

  • Fructose is a common dietary sugar, naturally occurring or added as a sweetener.
  • Fructose malabsorption is suspected to cause gastrointestinal symptoms, particularly in irritable bowel syndrome (IBS) patients.
  • The precise role and diagnostic criteria for fructose malabsorption are not well-established.

Purpose of the Study:

  • To clarify the relationship between fructose malabsorption and gastrointestinal symptoms in both healthy individuals and IBS patients.
  • To review the diagnostic challenges and current understanding of fructose malabsorption.

Main Methods:

  • Literature review of studies investigating fructose malabsorption and its link to gastrointestinal symptoms.
  • Analysis of diagnostic methods, including breath tests for fructose malabsorption.
  • Examination of fructose absorption capacity in normal individuals.

Main Results:

  • Diagnostic uncertainty exists due to the lack of definitive breath test cutoff values.
  • The normal capacity for fructose absorption varies among individuals.
  • A dose of 25 g of fructose is suggested as a potential threshold for diagnosing fructose malabsorption via breath testing.
  • Symptoms can arise from even mild fructose malabsorption, which is difficult to eliminate from the diet.

Conclusions:

  • Fructose malabsorption is a complex condition with diagnostic challenges.
  • Further research is needed to establish clear diagnostic criteria and understand its clinical significance in IBS.
  • Dietary management of fructose malabsorption requires careful consideration due to its prevalence in common foods.