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Related Concept Videos

Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Related Experiment Video

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Solid Plate-based Dietary Restriction in Caenorhabditis elegans
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Caloric restriction and the aging process: a critique.

Rajindar S Sohal1, Michael J Forster2

  • 1Department of Pharmacology and Pharmaceutical Sciences, University of Southern California, Los Angeles, CA 90089, USA.

Free Radical Biology & Medicine
|June 20, 2014
PubMed
Summary
This summary is machine-generated.

Caloric restriction (CR) extends animal lifespan, but this effect is not universal and depends on genotype. Overweight control animals may skew results, and CR differs from dietary restriction in invertebrates.

Keywords:
AgingCaloric restrictionDietary restrictionEnergy restrictionFree radicalsLife spanMechanisms of agingOxidative stressRedox stateRedox stress hypothesis of aging

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Area of Science:

  • Gerontology
  • Animal Physiology
  • Nutritional Science

Background:

  • Caloric restriction (CR) is a paradigm in gerontology, believed to retard aging and extend lifespan.
  • Emerging evidence challenges the universality and mechanisms of CR's effects on longevity.

Purpose of the Study:

  • To review the current understanding of the relationship between energy intake and animal lifespan.
  • To critically appraise the concept of caloric restriction's impact on aging and longevity.

Main Methods:

  • Reexamination of a large-scale study (60,000+ mice and rats) on body weight and longevity.
  • Comparative analysis of CR in mammals versus "dietary restriction" in invertebrates like Drosophila.

Main Results:

  • CR's lifespan extension is genotype-dependent and linked to body weight gain in ad libitum (AL) fed controls.
  • AL-fed control animals may be suboptimal for longevity studies due to obesity and disease.
  • CR in mammals and dietary restriction in Drosophila are distinct phenomena, not indicative of a conserved mechanism.

Conclusions:

  • CR extends lifespan in specific genotypes prone to energy imbalance from AL feeding.
  • CR's effects include lowered body temperature, metabolism, and oxidant production.
  • The benefits of CR are context-dependent and not universally applicable across species or strains.