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Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
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Carbohydrates, proteins, and fats are the primary macronutrients in the human diet. However, carbohydrates are the most favored source of energy in the body. They can be found in a wide variety of foods, including whole grains, fruit, and vegetables, in various forms, such as sugars, starch, and dietary fiber. Based on their structure, carbohydrates are classified into three main classes— monosaccharides, disaccharides, and polysaccharides. The body's cells can only utilize simple...
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Carbohydrate digestion and metabolism break down simple and complex carbohydrates from food into saccharides (i.e., sugars) for the body to use as energy. Carbohydrate digestion starts in the mouth during mastication, or chewing. The masticated carbohydrates remain intact in the stomach. Digestion resumes in the duodenum of the small intestine, where pancreatic alpha-amylase and brush border enzymes of the microvilli convert complex carbohydrates to monosaccharides. Finally, the monosaccharides...
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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.
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Complex carbohydrate utilization by gut bacteria modulates host food consumption.

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Area of Science:

  • Microbiology
  • Nutritional Science
  • Neuroscience

Background:

  • The gut microbiota plays a role in host feeding behavior, but the mechanisms are not fully understood.
  • Gut bacteria metabolize complex carbohydrates, producing metabolites that act as energy sources and signaling molecules.
  • Understanding how bacterial metabolism influences nutrient intake is crucial for comprehending food choices.

Purpose of the Study:

  • To investigate how the metabolism of fructose polysaccharides by gut bacteria affects host consumption of carbohydrate-containing diets.
  • To explore the relationship between bacterial fermentation of specific fructans and host feeding behavior.
  • To identify the neural pathways involved in this gut-bacterial-host interaction.

Main Methods:

  • Utilized a gnotobiotic mouse model colonized with specific Bacteroides species (B. thetaiotaomicron and B. ovatus).
  • Administered diets containing fructans with different glycosidic linkages (levan and inulin).
  • Assessed diet intake, manipulated bacterial genes involved in fructan utilization, and measured neuronal activation in the hypothalamus.

Main Results:

  • Mice consumed more of the diet containing carbohydrates that their colonizing bacteria could not ferment.
  • Mice colonized with B. thetaiotaomicron (ferments levan) ate more inulin diet; mice with B. ovatus (ferments inulin) ate more levan diet.
  • Altering bacterial fermentation capabilities affected diet preference, linking it to neuronal activation in the arcuate nucleus.

Conclusions:

  • Gut bacteria's nutrient metabolism directly modulates host food consumption based on differential energy extraction.
  • Host feeding behavior is influenced by the gut microbiota's ability to sense and process dietary nutrients.
  • This study provides insights into the complex interplay between gut bacteria, diet, and host food choice determination.