Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

6.3K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
6.3K
What are Estimates?01:06

What are Estimates?

8.2K
It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates. 
The estimate for the mean of a sample is denoted by ͞x, whereas the mean of the population is designated as μ. Further, parameters such...
8.2K
Cell Size01:22

Cell Size

126.2K
Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
126.2K
Estimation of k and VD of Aminoglycosides01:20

Estimation of k and VD of Aminoglycosides

215
Aminoglycosides are a class of antibiotics used to treat various bacterial infections. Clinicians must determine the elimination rate constant (k) and volume of distribution (VD) to optimize therapeutic efficacy and minimize toxicity. The k value represents the rate at which the drug is removed from the body, and the VD reflects the degree to which the drug distributes into body tissues. Accurately estimating these parameters allows healthcare professionals to tailor drug dosing to individual...
215
Optimal Foraging00:48

Optimal Foraging

13.7K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
13.7K
Formation of Species01:31

Formation of Species

44.7K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
44.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

What's on the menu? A review of school meal quality across twenty-nine countries.

Public health nutrition·2026
Same author

Dietary Patterns and Predictors of Food Insecurity and Poor Diet Among Children Less Than 5 Years in the Arid and Semi-Arid Region of Kenya: A Longitudinal Study.

Maternal & child nutrition·2026
Same author

Early introduction of complementary foods among infants exposed to maternal incarceration <i>in utero</i>.

Nutrition and health·2026
Same author

Factors that influence acute malnutrition detection and treatment by community health promoters in Samburu and Turkana counties, Kenya: A mixed methods study.

PLOS global public health·2026
Same author

Prevalence and risk factors of diarrhea among young children in Kenya's drylands: A longitudinal study.

PLOS global public health·2026
Same author

Implementing a multilevel, multicomponent intervention to engage fathers in complementary feeding in Northern Nigeria: Perceptions of deliverers and recipients.

PLOS global public health·2025

Related Experiment Video

Updated: Jan 21, 2026

Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
06:00

Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila

Published on: October 1, 2011

14.3K

Optimizing portion-size estimation aids: a formative evaluation in Malawi.

Courtney H Schnefke1, Chrissie Thakwalakwa2, Mary K Muth1

  • 1Food, Nutrition and Obesity Policy Research Program, RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC 27709, USA.

Public Health Nutrition
|July 23, 2019
PubMed
Summary

Photographic portion-size estimation aids (PSEA) are preferred in low-resource settings. Optimal PSEA design, using three portion sizes and specific visual characteristics, improves accuracy in food portion estimation during meal recalls.

Keywords:
Dietary assessment toolDietary intakeDietary recallLow-resource settingPortion-size estimation

More Related Videos

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer
03:55

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Published on: June 9, 2023

949
Contrast-Enhanced Subharmonic Aided Pressure Estimation SHAPE Using Ultrasound Imaging with a Focus on Identifying Portal Hypertension
06:20

Contrast-Enhanced Subharmonic Aided Pressure Estimation SHAPE Using Ultrasound Imaging with a Focus on Identifying Portal Hypertension

Published on: December 5, 2020

2.9K

Related Experiment Videos

Last Updated: Jan 21, 2026

Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
06:00

Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila

Published on: October 1, 2011

14.3K
Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer
03:55

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Published on: June 9, 2023

949
Contrast-Enhanced Subharmonic Aided Pressure Estimation SHAPE Using Ultrasound Imaging with a Focus on Identifying Portal Hypertension
06:20

Contrast-Enhanced Subharmonic Aided Pressure Estimation SHAPE Using Ultrasound Imaging with a Focus on Identifying Portal Hypertension

Published on: December 5, 2020

2.9K

Area of Science:

  • Nutrition science
  • Public health research
  • Dietary assessment methodology

Background:

  • Accurate dietary assessment is crucial for understanding nutritional status and informing public health interventions.
  • Portion-size estimation aids (PSEA) are commonly used in dietary recalls, but their effectiveness can vary, especially in low-resource settings.
  • Optimizing the design of PSEA is essential to improve the accuracy and usability of dietary data collection.

Purpose of the Study:

  • To evaluate user preferences and ease-of-use for various visual characteristics of printed and digital photographic portion-size estimation aids (PSEA).
  • To determine the accuracy of portion-size selections using PSEA with different visual attributes in a low-resource context.
  • To inform the development of optimized PSEA for improved dietary assessment.

Main Methods:

  • A convergent mixed-methods design was employed in Malawi's Blantyre and Chikwawa Districts.
  • Ninety-six women (aged 18-45 years) participated in a study involving self-served meals, weighed food/water consumption, and post-meal recalls using PSEA.
  • Semi-structured interviews were conducted to gather qualitative data on preferences and ease-of-use.

Main Results:

  • Participants preferred photographic aids over drawings, three or five portion options over fewer, a 45° angle over 90°, and simultaneous over sequential presentation.
  • Approximately 50-75% of participants found the depicted portion sizes appropriate for their consumption.
  • Photographs with three portion sizes, a 45° angle, and simultaneous presentation yielded the most accurate portion-size selections.

Conclusions:

  • The visual characteristics of PSEA significantly influence user preferences, ease-of-use, and accuracy.
  • Optimized PSEA, incorporating preferred visual elements, can enhance the reliability of dietary intake data.
  • Findings can guide the development of more effective PSEA for use in low-resource settings and meal recall studies.