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Related Concept Videos

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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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Lifestyle factors play a critical role in maintaining overall health and preventing chronic diseases. Key elements, such as regular physical activity, a nutritious diet, and abstinence from smoking, can significantly enhance physical, mental, and emotional well-being while reducing the risk of several life-threatening conditions.
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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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Longitudinal Studies01:26

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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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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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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Related Experiment Video

Updated: Mar 15, 2026

Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans
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Does early-life diet affect longevity? A meta-analysis across experimental studies.

Sinead English1, Tobias Uller2

  • 1Edward Grey Institute, Department of Zoology, University of Oxford, Oxford, UK Department of Zoology, University of Cambridge, Cambridge, UK sineadenglish@cantab.net.

Biology Letters
|September 8, 2016
PubMed
Summary

Early nutrition

Keywords:
caloric restrictionearly developmentlifespanmeta-analysisnutrition

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Nutritional science

Background:

  • Life-history theory suggests nutrition impacts lifespan via trade-offs in resource allocation.
  • Previous studies show mixed results on the effects of early diet on longevity.

Purpose of the Study:

  • To conduct a meta-analysis on experimental studies of diet manipulation and lifespan.
  • To investigate whether early diet generally affects lifespan and explore moderating factors.

Main Methods:

  • Meta-analysis of experimental studies manipulating pre- or post-natal diet.
  • Meta-regression analysis incorporating experimental and life-history traits as moderators.

Main Results:

  • No overall effect of early diet on lifespan was detected.
  • Pre-natal diet manipulations were found to reduce lifespan.
  • No significant effects were observed for later diet, manipulation type, development mode, or sex.

Conclusions:

  • Findings suggest early diet restriction may disrupt growth and increase somatic damage, leading to reduced lifespan.
  • Results caution against overemphasizing early diet's impact on lifespan, especially under laboratory conditions.