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Measurement of Bioavailability: Pharmacokinetic Methods

Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...
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Related Experiment Video

Updated: May 25, 2026

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake
04:46

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

Published on: September 18, 2018

Validated Food Quantification Aids for Dietary Assessment: A Systematic Review.

Elijah O Fadeiye1, Hannah Al-Sehaim2, Jacqueline M McCormack1

  • 1Faculty of Science and Health, Atlantic Technological University, Sligo, F91 YW50, Ireland.

Nutrition Reviews
|May 23, 2026
PubMed
Summary

Accurate dietary assessment requires reliable food portion size aids, but many lack validation. This review found significant variation in aid accuracy and methodology, highlighting the need for standardized validation guidelines.

Keywords:
comparisondietary assessmentevaluationfood portion accuracyfood quantificationphotographic atlasportion-size aidsusabilityvalidation quality

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Iterative Development of an Innovative Smartphone-Based Dietary Assessment Tool: Traqq
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Published on: March 19, 2021

Related Experiment Videos

Last Updated: May 25, 2026

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake
04:46

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

Published on: September 18, 2018

Iterative Development of an Innovative Smartphone-Based Dietary Assessment Tool: Traqq
04:54

Iterative Development of an Innovative Smartphone-Based Dietary Assessment Tool: Traqq

Published on: March 19, 2021

Area of Science:

  • Nutrition science
  • Dietary assessment methodology

Background:

  • Accurate dietary intake measurement is crucial for health research and clinical practice.
  • Existing food portion size aids often lack sufficient validation, impacting their reliability and feasibility.

Purpose of the Study:

  • To systematically identify and evaluate the characteristics and methodological quality of validation studies for food quantification aids.
  • To assess the accuracy and variability of different types of food portion size aids.

Main Methods:

  • A systematic review of validation studies for food quantification aids was conducted.
  • Searched four databases (PubMed, Web of Science, Scopus, EMBASE) up to March 2025.
  • Included 74 articles encompassing 136 food quantification aids, assessing study details and quality.

Main Results:

  • Standardized food photographs were the most common (57%) and accurate aid type.
  • A wide range of percentage errors was observed, from -92% to +413%.
  • Only 20% of studies met high appropriateness criteria; usability was generally rated positively.

Conclusions:

  • Significant variation exists in the validation methods and accuracy of food portion size aids.
  • Standardized guidelines are needed for validating food quantification aids to improve dietary assessment accuracy.