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Longitudinal Research02:20

Longitudinal Research

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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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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Mitochondria01:37

Mitochondria

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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

Updated: Oct 4, 2025

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
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Association between Circulating Antioxidants and Longevity: Insight from Mendelian Randomization Study.

Zhimin Yu1,2, Fangfang Zhang3, Chengkai Xu1

  • 1Department of Internal Medicine, Zhongnan Hospital of Wuhan University, Wuhan 430071, China.

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|February 8, 2022
PubMed
Summary

Higher retinol metabolite levels are linked to increased longevity and longer parental lifespan. Other antioxidants like vitamin C and E showed no causal effect on life expectancy in this study.

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Area of Science:

  • Nutritional Epidemiology
  • Genetic Epidemiology
  • Gerontology

Background:

  • Antioxidants are studied for disease prevention, but evidence on their long-term impact on longevity is conflicting.
  • Observational studies suggest a link between antioxidants and reduced mortality, while clinical trials show neutral or harmful effects.
  • The causal relationship between sustained exposure to circulating antioxidants and human lifespan remains uncertain.

Purpose of the Study:

  • To investigate the causal association between long-term circulating antioxidant exposure and longevity.
  • Utilized a two-sample Mendelian randomization (MR) design in the general population.
  • Examined specific antioxidants including ascorbate, lycopene, selenium, beta-carotene, and retinol and their metabolites.

Main Methods:

  • Identified genetic instruments for circulating antioxidants and metabolites from large genome-wide association studies (GWASs).
  • Extracted summary statistics for survival to advanced age (90th vs. 60th percentile) and parental lifespan.
  • Employed inverse-variance weighted (IVW) method for primary analysis, with sensitivity analyses to ensure result robustness.

Main Results:

  • Genetically determined higher levels of circulating retinol (vitamin A) metabolite were causally associated with increased odds of longevity (OR, 1.07) and longer parental lifespan (0.17 years per 10-fold increase).
  • No causal association was found for circulating ascorbate (vitamin C), tocopherol (vitamin E), lycopene, selenium, or beta-carotene with life expectancy.
  • Sensitivity analyses indicated no significant bias from pleiotropic effects of the genetic instruments.

Conclusions:

  • Long-term elevated exposure to retinol metabolite is causally linked to enhanced longevity in the general population.
  • Current evidence does not support a causal role for other tested antioxidants (vitamins C, E, lycopene, selenium, beta-carotene) in promoting longevity.
  • Further MR studies with larger sample sizes and more genetic variants are recommended to validate these findings.