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Related Concept Videos

Dietary Connections01:23

Dietary Connections

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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Restriction Enzymes01:11

Restriction Enzymes

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Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
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Proteins: Dietary Sources and Requirements01:28

Proteins: Dietary Sources and Requirements

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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
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Carbohydrates: Dietary Sources and Requirements01:15

Carbohydrates: Dietary Sources and Requirements

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Carbohydrates are predominantly obtained from plant sources. With the exception of lactose found in milk and insignificant glycogen amounts in meat, most consumed carbohydrates have plant origins. Monosaccharides and disaccharides, or sugars, can be sourced from fruits, honey, milk, sugar cane, and sugar beets. Grains and vegetables are rich in the polysaccharide starch. Two types of polysaccharides provide fiber: cellulose, which is abundant in many vegetables, forms undigestible roughage or...
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Lipids: Dietary Sources and Requirements01:18

Lipids: Dietary Sources and Requirements

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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Solid Plate-based Dietary Restriction in Caenorhabditis elegans
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Is Rapamycin a Dietary Restriction Mimetic?

Archana Unnikrishnan1, Kavitha Kurup1, Adam B Salmon2,3

  • 1Reynolds Oklahoma Center on Aging and Department of Biochemistry & Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|March 12, 2019
PubMed
Summary

Rapamycin, a nutrient signaling inhibitor, extends lifespan like dietary restriction. However, research shows they work differently, suggesting combined use may enhance longevity effects.

Keywords:
Dietary restrictionInsulin sensitivityLifespanRapamycinTOR

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Area of Science:

  • Gerontology and aging research
  • Molecular biology and nutrient signaling pathways
  • Comparative longevity studies across species

Background:

  • Rapamycin, an inhibitor of the target of rapamycin (TOR) pathway, has been proposed as a dietary restriction mimetic due to its lifespan-extending properties.
  • Both dietary restriction and rapamycin have demonstrated positive effects on lifespan, pathology, and age-related physiological decline in various species, including mice.

Purpose of the Study:

  • To review and compare the effects of dietary restriction and rapamycin in mice.
  • To elucidate whether rapamycin truly mimics dietary restriction's impact on aging processes.

Main Methods:

  • Review of existing research comparing dietary restriction and rapamycin interventions in mice.
  • Analysis of molecular pathways and processes affected by each intervention.
  • Examination of effects on genetically manipulated mouse models.

Main Results:

  • Dietary restriction and rapamycin exhibit distinct effects on numerous molecular pathways and processes.
  • These interventions differentially impact the lifespan of various genetically modified mouse models.
  • While some overlapping effects exist, overall mechanisms differ significantly.

Conclusions:

  • Rapamycin is unlikely to be a true dietary restriction mimetic.
  • Dietary restriction and rapamycin appear to promote longevity and retard aging through largely separate mechanisms.
  • Combining dietary restriction and rapamycin may yield synergistic benefits for lifespan extension.