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Updated: Jan 3, 2026

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Intervention Studies in Humans.

Begoña Olmedilla-Alonso1

  • 1Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Madrid, Spain. BOlmedilla@ictan.csic.es.

Methods in Molecular Biology (Clifton, N.J.)
|November 21, 2019
PubMed
Summary

Human intervention studies offer the strongest evidence for evaluating nutrient and bioactive food component effects on health and disease. This review outlines key study designs and selection factors for researchers.

Area of Science:

  • Nutritional Science
  • Human Health Research
  • Bioactive Food Components

Background:

  • Human intervention studies are crucial for establishing evidence on nutrient and bioactive food component impacts.
  • Study design selection is critical for valid health and disease assessment.
  • Various intervention designs exist, each with specific applications.

Purpose of the Study:

  • To present the primary intervention study designs used in human nutrition research.
  • To outline critical factors for selecting and developing appropriate study designs.
  • To enhance the rigor of evidence generation in nutritional science.

Main Methods:

  • Review of established human intervention study designs.
  • Discussion of factors influencing design selection (e.g., study objectives, population).
Keywords:
BiomarkersCarotenoidsHuman intervention studiesProvitamin A

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  • Synthesis of best practices for developing intervention studies.

    • Main Results:

    • Human intervention studies provide the highest level of evidence.
    • Different study designs (e.g., randomized controlled trials, observational studies) are suitable for different research questions.
    • Careful consideration of study objectives and participant factors is essential for design selection.

    Conclusions:

    • The choice of intervention study design significantly impacts the quality of evidence on nutrient and bioactive food component effects.
    • Researchers must carefully consider study objectives and available resources when selecting a design.
    • Appropriate design selection is fundamental for advancing nutritional science and public health recommendations.