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Related Concept Videos

Glycolysis: Preparatory Phase01:21

Glycolysis: Preparatory Phase

In cellular metabolism (the complete breakdown of glucose to extract energy),  glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
Sugars as Energy Storage Molecules01:10

Sugars as Energy Storage Molecules

Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
Sugars as Energy Storage Molecules01:10

Sugars as Energy Storage Molecules

Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
Overview of Carbohydrate Metabolism01:19

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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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Phloem and Sugar Transport02:02

Phloem and Sugar Transport

Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.
ATP Energy Storage and Release01:31

ATP Energy Storage and Release

ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...

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Updated: May 10, 2026

Appetitive Associative Olfactory Learning in Drosophila Larvae
09:22

Appetitive Associative Olfactory Learning in Drosophila Larvae

Published on: February 18, 2013

Fructose in perspective.

Richard D Feinman1, Eugene J Fine

  • 1State University of New York Downstate Medical Center, Brooklyn, NY, USA. feinman@mac.com.

Nutrition & Metabolism
|July 3, 2013
PubMed
Summary
This summary is machine-generated.

Dietary fructose is best understood as part of carbohydrate metabolism, not inherently harmful. Its effects often overlap with glucose, and carbohydrate restriction remains key for metabolic health.

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Last Updated: May 10, 2026

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Area of Science:

  • Nutrition Science
  • Biochemistry
  • Metabolic Health

Background:

  • Public and scientific discourse increasingly questions dietary fructose's unique harmfulness, with calls for regulation.
  • Conflicting data exist regarding fructose's role in obesity and metabolic syndrome, with some studies suggesting total carbohydrate intake is a more reliable cause.

Purpose of the Study:

  • To review the basic metabolic reactions of fructose to place its effects in perspective.
  • To clarify whether fructose possesses unique harmful properties distinct from its role as a carbohydrate.

Main Methods:

  • Review of fundamental metabolic pathways for fructose and glucose.
  • Analysis of experimental data comparing fructose and glucose effects.
  • Consideration of substrate control mechanisms in fructose metabolism.

Main Results:

  • Fructose and glucose metabolism converge at the triose-phosphate level, leading to shared downstream effects.
  • A significant portion of ingested fructose is converted to glucose.
  • Deleterious effects of fructose alone suggest its metabolism is partly controlled by glucose.

Conclusions:

  • Fructose should be understood as a component of carbohydrate metabolism, not an independent toxin.
  • Experimental designs comparing fructose and glucose require careful consideration of carbohydrate controls.
  • Dietary carbohydrate restriction is the most effective strategy for obesity, diabetes, and metabolic syndrome.