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Related Concept Videos

Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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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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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...
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Aging01:26

Aging

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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.
Cellular Clock Theory
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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.
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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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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

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Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
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Related Experiment Video

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Determining Gender-Based Differences in Retinal and Choroidal Thickness in Underweight Individuals via Swept-Source Optical Coherence Tomography
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Global associations between macronutrient supply and age-specific mortality.

Alistair M Senior1,2,3, Shinichi Nakagawa4,5,6, David Raubenheimer4,2

  • 1Charles Perkins Centre, University of Sydney, Sydney, NSW 2006, Australia; alistair.senior@sydney.edu.au.

Proceedings of the National Academy of Sciences of the United States of America
|November 17, 2020
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Global nutrient supplies significantly impact national mortality patterns. Undernutrition lowers life expectancy, while overnutrition in wealthy nations increases mortality, with optimal macronutrient intake varying by age.

Keywords:
caloriedietfood securitylife spannutrition

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Area of Science:

  • Nutritional science
  • Demography
  • Public health

Background:

  • Animal studies and human epidemiology suggest diet influences lifespan and mortality.
  • Macronutrient intake and energy balance are key factors in aging and mortality patterns.

Purpose of the Study:

  • To investigate the macrolevel relationship between national nutrient supplies and age-specific mortality (ASM).
  • To identify optimal macronutrient compositions for minimizing mortality across different age groups globally.

Main Methods:

  • Analysis of global food supply data and 1,879 life tables from 103 countries.
  • Statistical modeling to assess macronutrient supply as a predictor of ASM, controlling for time and economic factors.

Main Results:

  • Macronutrient supplies strongly predict ASM, independent of economic and temporal factors.
  • Undernutrition is linked to reduced life expectancy and increased mortality, while overnutrition, particularly high fat and carbohydrate intake, is associated with higher mortality in affluent nations.
  • An energy intake of approximately 3,500 kcal/cap/day minimized overall mortality, but optimal macronutrient ratios differ by age.

Conclusions:

  • National macronutrient supplies are critical determinants of population mortality patterns.
  • Dietary strategies to minimize mortality require age-specific adjustments in macronutrient composition.
  • Findings align with animal experimental data and human epidemiological studies on diet and chronic disease risk.