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Related Concept Videos

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are not...
Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...

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Related Experiment Videos

Diet and aging.

Matthew D W Piper1, Andrzej Bartke

  • 1UCL Institute of Healthy Ageing, University College London, London, WC1E 6BT, UK. m.piper@ucl.ac.uk

Cell Metabolism
|August 6, 2008
PubMed
Summary
This summary is machine-generated.

Dietary restriction extends lifespan through a conserved mechanism. However, diet and genetic interactions reveal a more complex view, impacting aging studies in model organisms.

Related Experiment Videos

Area of Science:

  • Gerontology and molecular biology
  • Study of aging mechanisms
  • Nutritional science

Background:

  • Dietary restriction (DR) is known to extend lifespan across various species.
  • This efficacy has led to the hypothesis of a single, evolutionarily conserved molecular mechanism driving lifespan extension.
  • A unified view of aging is challenged by emerging data.

Purpose of the Study:

  • To explore the mechanistic complexity of dietary restriction's effects on lifespan.
  • To investigate the role of diet/genotype interactions in aging.
  • To re-evaluate the interpretation of model organism aging studies.

Main Methods:

  • Review of existing literature on dietary restriction and aging.
  • Analysis of case studies involving diet/genotype interactions.
  • Comparative analysis of aging phenotypes in model organisms under different dietary conditions.

Main Results:

  • Diet/genotype interactions demonstrate that a single molecular mechanism for lifespan extension is insufficient.
  • Mild dietary modifications can significantly alter aging phenotypes.
  • The interpretation of aging studies in model organisms is sensitive to dietary context.

Conclusions:

  • A more complex, multifactorial view of aging mechanisms is required.
  • Dietary interventions interact with genetic backgrounds to influence lifespan.
  • Careful consideration of dietary conditions is crucial for accurate aging research in model organisms.