annotated bibliography education example

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Sample Abstract from ERIC

The image below shows an example Abstract that includes the purpose, methods, results, and implications (in that order). 

Save annotations in EBSCO account

Use the "Create Note" tool and write your annotation. Copy/paste it to your paper.  Or sign up for an EBSCO account (free) so you can save notes.

Save your annotations in your EndNote Basic Account

If you are using your EndNote Basic account to keep track of your references,

• write your annotation in the the "Reference Notes" field,   
• then when you are FORMATING your paper and creating your BIBLIOGRAPHY, choose the STYLE APA ANNOTATION SENTENCE STYLE.

Example of Annotated Bibliographies entries (in APA format)  

Goldschneider, F. K., Waite, L. J., & Witsberger, C. (1986). Nonfamily living and the erosion of traditional family orientations among  young adults.  American Sociological Review,   51,  541-554.

The authors, researchers at the Rand Corporation and Brown University, use data from the National Longitudinal Surveys of Young Women and Young Men to test their hypothesis that nonfamily living by young adults alters their attitudes, values, plans, and expectations, moving them away from their belief in traditional sex roles. They find their hypothesis strongly supported in young females, while the effects were fewer in studies of young males. Increasing the time away from parents before marrying increased individualism, self-sufficiency, and changes in attitudes about families. In contrast, an earlier study by Williams cited below shows no significant gender differences in sex role attitudes as a result of nonfamily living.  

Graybosch, A., Scott, G.M. & Garrison, S. (1998). The Philosophy Student Writer's Manual.  Upper Saddle River, NJ: Prentice Hall.

Designed to serve as either as a writing guide or as a primary textbook for teaching philosophy through writing, the  Manual  is an excellent resource for students new to philosophy. Like other books in this area, the  Manual  contains sections on grammar, writing strategies, introductory informal logic and the different types of writing encountered in various areas of philosophy. Of particular note, however, is the section on conducting research in philosophy. The research strategies and sources of information described there are very much up-to-date, including not only directories and periodical indexes, but also research institutes, interest groups and Internet resources.

Examples of What Your Bibliography Should Not Look Like:

Marieb, Elaine N. (1992). Human Anatomy and Physiology  Redwood City, CA: The Benjamin/ Cummings Co.

• I use this book to get the basic information about arthritis, it was very informative.

Keefe FJ., (1996) Pain in Arthritis and musculoskeletal disorders.  Journal of Orthopaedic & Sports Physical Therapy, 24, 279-290

• I got all the facts about exercising with arthritis and the different types of exercise.

How to write an annotated blbiography

An annotated bibliography is....

• a list of citations to books, articles, and documents
• in an appropriate style format  i.e.,APA, Chicago Manual of Style, etc.
• with brief (usually about 150 words)  descriptive and evaluative  paragraphs -- the annotations (or abstracts).

The annotations  inform the reader of the relevance, accuracy, and quality of the sources;  they expose the  author's point of view, clarity and appropriateness of expression, and authority.

The Process

• First, locate books, articles, reports, etc. Use library databases like ERIC ,   Education Source   or Google Scholar . Get help on this at  http://guides.lib.purdue.edu/education .
• Select those works that provide a  variety of perspectives  on your topic.
• Cite the book, article, or document using the appropriate style.

• Write  ( do not copy the abstract from the database) a concise annotation that  summarizes the central theme and scope  of the book or article. Include  one or more sentences  that:

o    evaluate the authority or background of the author,

o    comment on the intended audience,

o    compare or contrast this work with another you have cited, or

o    explain how this work illuminates your bibliography topic.

The annotation should include most, if not all, of the following:

• Explanation of the  main purpose and scope  of the cited work;
• Brief description of the work's  format and content ;
• Theoretical basis and  currency of the author's argument ;
• Author's  intellectual/academic credentials ;
• Work's  intended audience ;
• Value and significance  of the work as a contribution to the subject under consideration;
• Possible  shortcomings or bias  in the work;
• Any  significant special features  of the work (e.g., glossary, appendices, particularly good index);
• Your own brief impression of the work .

An annotated bibliography is an  original work created by you . Don't copy the annotation from the book introduction or jacket. Write it yourself. Copying is plagiarism and intellectual dishonesty.

How to Write an Abstract

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Home / Guides / Citation Guides / Citation Basics / Annotated Bibliography Format & Examples

Annotated Bibliography Format & Examples

A complete guide to the mla & apa annotated bibliography.

If you’ve just received an assignment that requires an MLA or APA annotated bibliography, you may be wondering where to start. This guide will help answer all of your questions and includes step-by-step instructions on how to do an annotated bibliography in MLA style, as well as an APA annotated bibliography. You will also find sample annotated bibliographies, real-life examples, and opportunities to practice what you have learned.

The MLA ( Modern Language Association ) and APA (American Psychological Association) are not associated with this guide. All of the information provided here, however, offers direction for students and researchers who use these citation styles in their work.

The structures and annotated bibliography templates on this page were created by the in-house librarians at EasyBib.com.

If you’re simply looking for an example of an annotated bibliography (both in MLA format and APA format), scroll down toward the bottom of the page. We’ve included links to visuals for those of you who need help with the structure and styling of an annotated bibliography. If you’re looking for a variety of annotated bibliography topics, and you’re truly searching for the answer to, “What is an annotated bibliography?” then continue reading!

Here’s a run-through of everything this page includes:

Table of contents

What is an annotated bibliography, annotations vs. abstract, why include annotations.

• Step 1: Analyze your sources

Step 2: Write the descriptions

• Step 3a: Formatting an MLA style annotated bibliography
• Step 3b: Formatting an APA style annotated bibliography

Annotated Bibliography Templates

Using the easybib annotation tool.

A bibliography is a complete list of the sources that were used to complete a research paper or project.

Depending on the style guide you follow, you may also see this called a Works Cited (also called an MLA bibliography) or Reference List (APA format). Each listed source, or citation , shares information about the author, title, publishing year, and other details that serve to credit the original authors whose work informed your research. These details also help other students and researchers find and read the source materials.

When your research is related to a scholastic assignment, you should always verify your instructor’s requirements for the types and number of sources to include, as well as the style you should adhere to when formatting your paper and bibliography.

An MLA annotated bibliography and an APA format annotated bibliography are bibliographies that include a concise explanation, or annotation , of each listed source. Depending on the assignment, this annotation may be solely descriptive, or analytical.

An abstract and annotation should not be confused; they differ in both their substance as well as their placement in a paper.

Annotations: 

• Usually found in bibliographies at the end of a paper
• Are subjective
• Purpose is to summarize and evaluate . It should briefly communicate the work’s main point, but also discuss the background of the author or study, and the strengths/weaknesses of the work.

Abstracts: 

• Usually found in journal databases or the beginning of a paper
• Are objective
• Purpose is to summarize . It should provide a short overview of the article and communicate the main points and themes.

If you would like to learn more , this link further explores the difference between an abstract and an annotation.

This resource provides additional information on how to write a bibliography with annotations in other formats. You can also take advantage of the plagiarism checker and bibliography tools that come with EasyBib Plus to help you create your reference lists.

Before you learn how to make an annotated bibliography, you may be wondering why you need to.

Sometimes instructors want you to create and include annotations in your bibliography, either as part of an assignment or as an assignment unto itself. Understanding the purpose of this approach to your reference list can help to ensure that you gain all of the benefits that the annotated bibliography process provides.

As a student, this method will help you develop or hone your research skills, providing you with practice not only in locating sources but also in analyzing and evaluating them for relevance and quality.

Your instructor will gain insight into your research abilities, as well, allowing them to assess your work more thoroughly. If you plan to publish your research, this comprehensive approach to detailing your sources will provide readers and other researchers with a substantial directory of resources to evaluate for their own work.

Whether you’re publishing or submitting your annotated bibliography, make sure your spelling and wording is correct! If you need to brush up on any parts of speech topics, check out our interjection , determiner , and adverb pages!

Step 1: Analyze your sources 

Each annotation should be a summarization or analysis of your source. If you have been tasked with writing annotations as part of a research paper or project, begin to create both the citation and notes on the source while you identify and analyze your sources.

Not only will this approach help you to hone your research skills and identify sources that are relevant and useful for your topic, but you will also save time. When done in this manner, both your citations and annotations will be nearly complete before you begin to write the body of your paper.

Analyzing your potential sources requires a two-pronged approach that first evaluates the author, publication, and date, and then examines the content.

When conducting your initial assessment of the source, consider some of the following questions to guide your appraisal:

• What qualifies the author to write on this subject?
• Is the author affiliated with a reputable institution in this field?
• Is the author credentialed or otherwise considered an expert in this field?
• Is this source current?
• Is this the most recent edition?
• Is the publisher reputable?
• Is the journal reputable?

Once your primary evaluation is complete, you will move on the assessing the content itself. Consider some of these elements as you review each source:

• Who is the intended audience?
• Is the author presenting her opinion or interpretation as the truth, or stating facts?
• What supporting evidence does the author provide?
• Did the author perform the research, or curate and present the research of others?
• If the author used the research of others, are the sources the author cites credible?
• Are there errors or omissions of fact?
• Is the author writing objectively and without bias?

Also, consider the value each source provides to you:

• Is the information helpful for your particular assignment?
• Does it help answer your research question(s)?
• Is this source different from your other sources, or does it repeat information you already have?
• Is the source providing you with a different perspective on your topic, or changing your beliefs or thinking about your subject?

To make it easier for you to create your reference page, write your notes in the format you will be using when you construct this part of the assignment (for instance, as short phrases or complete sentences). Once you have identified all of the sources you wish to include, you will merely need to insert what you have already written on the page and write your citation, which is explained in the next section.

Click here for additional information and a supplementary annotated bibliography sample. For an MLA bibliography example (with annotations),  check out our visual example of an MLA annotated bibliography .

An annotated bibliography entry may be written either as short phrases or complete sentences. Your instructor will advise you of which approach you are required to take.

Annotations should include either:

• The main points from the source, as well as the topics covered, the approach used, and any findings.
• Or your critical evaluation.
• A standard annotation is approximately one paragraph.
• Take care not to include any unnecessary details, as the goal is to summarize each source as succinctly as possible and, in some cases, evaluate them.
• Your field of study or instructor will determine what format your annotated bibliography will use. In this guide, you’ll find examples of an MLA and an APA annotated bibliography.

Here is an annotated bibliography example MLA annotation for the book The Elements of Eloquence: Secrets of the Perfect Turn of Phrase by UK author and blogger Mark Forsyth:

The author, Mark Forsyth, examines the rhetorical devices used in the English language, analyzing the patterns and formats that create memorable quotes. He traces the history of rhetoric to the Ancient Greeks, and provides an abridged timeline, following their use and evolution through to modern day. The author also explores the broader subject of persuasion and maps out the role that the figures of rhetoric play in it. In all, he examines over thirty devices, dissecting notable passages and phrases from pop music, the plays of William Shakespeare, the Bible, and more to explore the figures of rhetoric at work within each of them. Thorough definitions accompany this examination of structure to demonstrate how these formulas have been used to generate famously memorable expressions as well as how to reproduce their effects.

Notice how the annotated bibliography MLA entry above is descriptive enough so the reader has an idea of what the source is about with just a single paragraph. For more information on annotations, check out this informative site . If you’re looking to strengthen your writing in general, reading these grammar guides could be a good start.

For guidance on creating entries in MLA format , APA format , and more styles , check out the EasyBib library of resources or try the EasyBib annotation tool—we talk about it below!

Step 3a: MLA annotated bibliography format

The MLA Style Center and the current edition of the MLA Handbook provide the following guidance for formatting an MLA annotated bibliography:

• Title your reference page as “Annotated Bibliography” or “Annotated List of Works Cited.”
• Place each annotation after its reference.
• Annotations should typically not exceed a single paragraph.
• Annotations should be indented one inch from the start of your citation.
• Double-space all text on the page.
• 1-inch margins around the page.

Sources in an annotated bibliography can be organized alphabetically by the first word in each reference (as with a normal Works Cited page), by publication date, or by subject.

For a visual example of an annotated bibliography, as well as specific annotation examples, visit the MLA annotated bibliography guide .

If you are required to share your references in a manner other than in MLA bibliography format, the EasyBib style guides can help you with many common styles. While you’re at it, check out their conjunction , preposition , and pronoun pages to help keep your paper in mint condition!

Step 3b: APA annotated bibliography format

The American Psychological Association states that your instructor should set the guidelines for your annotated bibliography, but asks that the bibliography be formatted according to their standard reference page rules (see Section 9.51 of the Publication Manual ). If your teacher has requested an APA formatted annotated bibliography, first ask them for guidelines. Otherwise, here are some quick rules for you to follow:

• Double space all text on the page.  
• Title your page “Annotated Bibliogra phy”. Bold and center the title.  
• Organize references alphabetically by the first word of each reference.  
• Only the first line of a ref erence is flush with the left margin. Any other lines after the first line should be indented ½ inch from the left.  
• Add annotations on the next line after their paired reference.   
• Fully indent annotations by a ½ inch from the left.  
• Keep annotations short. No more than one paragraph.  

For examples of a  properly formatted APA annotation, visit this guide on APA annotated bibliographies .  

In comparison to the sample annotated bibliography MLA, the APA sample formats its page elements and references differently.

Students and researchers who type their research notes can save time by using an annotated bibliography template in MLA format while reviewing and analyzing sources. By adding the relevant information into a pre-formatted template, you’ll create a resource that helps you when you begin writing your paper in addition to saving time by completing your references and summaries alongside your research.

Students who prefer to take notes by hand can employ a modified version of this approach, with an additional step required to transfer your handwritten and formatted references from your notebook to populate your reference page.

Bibliography Template for MLA

To create an annotated bibliography MLA template, copy the following details into the program in which you will take notes or hand write it on the top margin of a page in your notebook. For each source, use this template to guide you as you identify the necessary details and insert them into your notes:

• Author (Last name, First name).
• Title of source.
• Title of the container ,
• Other contributors (names and roles),
• Publication Date,
• Location of the source (such as URL or page range).
• Summary or Analysis.

The MLA 9 model for MLA works cited entries offers a single format for all source type, and a great deal of flexibility to include the information most relevant to your topic and omit that which isn’t.

Hopefully our visual annotated bibliography example in MLA above has helped. If you still have lingering questions, visit the MLA Style Center online ( linked here ). Also, here’s a guide if you’re looking for more on the related topic of MLA in-text & parenthetical citations .

Bibliography Template for APA

Students and researchers who are still asking themselves how to piece together an annotated bibliography, or still questioning what is an annotated bibliography, could probably benefit from a template, similar to the one above. This one, however, is for those of you who are tasked with creating an annotated bibliography in the style created by the American Psychological Association.

The tricky thing about this specific style though, is that every reference is styled differently. Books, websites, journal articles, newspaper articles, and many others each have their own reference structure.

For most sources though, you should look for the following, basic information:

• Type of source
• Author (last name, first name)
• Title of source/article/web page, etc.
• Title of where source was found (e.g., database name, website name, etc.)
• Other contributors (names and roles)
• Location of the source (such as URL, DOI, or page range)
• Summary or Analysis

We understand it can get tricky, and it’s very different from the Modern Language Association’s structure for references. Take a moment to either use the other handy guides on EasyBib.com or use our automatic generator to form your references in just a few clicks. Our tools help take the pain away from having to rack your brain to form references properly. Capitals, lowercase letters, italics, quotation marks, punctuation in the appropriate places, it can all be quite overwhelming. Do yourself a favor, and use the EasyBib automatic citation generator.

Even though there are a lot of different variations, here’s a commonly used structure for sources:

Author’s Last Name, First initial, Middle initial. (Year the source was published). Title of the source . Retrieved from (insert the website address here)

Underneath the reference, include your summary or analysis paragraph.

Hopefully, this page helped answer all of your “What is an annotated bibliography?” questions. If you’re seeking out an annotated bibliography generator, follow the steps above the annotated bibliography examples.

Looking for additional help with other related topics? Don’t forget about the various beneficial guides on EasyBib.com! Our APA in-text citation guide and our APA parenthetical citation guide are two of our most popular pages. Learn the ins and outs of referencing your work in the body of your paper with our thorough, complete, and reader-friendly guides.

If you are creating a bibliography in MLA format, the EasyBib MLA bibliography generator can help save you time formatting your citations and annotations correctly. You can create entries for websites, books, videos, databases, dictionary articles, and many other types of sources.

In addition to forming the citations, you can also enter your annotation text to produce the complete entry for each source. The process for this is simple. You can follow along below to practice creating one:

• First, select your source type from among the 50+ available options. For this example, we will use the acting career of Keanu Reeves as our research topic and use the movie Point Break from 1991 as our first source. To cite this film, you would select the option for “Film/Online Video.” As you follow along, pick the option that is suitable for your source if you are using a different example.
• Enter the title of your source or, if you are citing a website, you may enter the URL. (Now would be a great time to peek at how to cite websites in MLA ). After you enter the title or URL for your reference, the EasyBib citation tool will scan for titles that match it and provide you with a list of results. Select “Cite this” next to the listing that matches your source.
• You will see a citation form. This gives you the option to add additional relevant or necessary information. For our sample topic, we will specifically cite Keanu Reeves as the performer and Kathryn Bigelow as the director.
• After entering any additional details, you have the option to expand your entry and include an annotation. To do so, select “Add annotation” at the bottom of the page, and a text box will open up.

Then, type your summary or analysis into the text box. If you took notes during the research stage using the format of your paper, this might be as simple as copying and pasting your already written summary or critique. Once you have entered all of the necessary information, select “Create citation” to generate the complete entry. You can then copy and paste this into your MLA bibliography.

Here’s what it’ll look like:

Point Break . Directed by Kathryn Bigelow, performance by Keanu Reeves, 20th Century Fox, 1991.

Reeves’ role as rookie FBI Agent Johnny Utah in Point Break marks the turning point in his Hollywood film career. While he’d risen to fame due to the success of the Bill and Ted franchise, his status today as an action star began when Point Break provided him with the material to establish himself as capable of portraying more than the lovable but unserious characters of his previous starring roles. In a parallel arc, director Kathryn Bigelow’s career also sees a shift beginning with Point Break , establishing her within the traditional action genre as a serious director capable of creating high-action and visually memorable films. While Point Break leaves plenty to be desired in terms of dialogue, it afforded Bigelow and Reeves the opportunities to showcase themselves and their talent in new ways that still echo in their work today.

• Works Cited

Harner, James L.  On Compiling an Annotated Bibliography . 2nd ed., Modern Language Association of America, 2000.

MLA Handbook . 9th ed., Modern Language Association of America, 2021.

Publication Manual of the American Psychological Association . 7th ed., American Psychological Association, 2020.

“What Guidance Should I Give My Students for Preparing an Annotated Bibliography?” The MLA Style Center , The Modern Language Association, 4 Nov. 2016, style.mla.org/annotated-bibliographies/.

Visit our EasyBib Twitter feed to discover more citing tips, fun grammar facts, and the latest product updates.

Published October 18, 2015. Updated July 25, 2021.

Written and edited by Michele Kirschenbaum and Elise Barbeau. Michele Kirschenbaum is a school library media specialist and is the in-house librarian at EasyBib.com. Elise Barbeau is the Citation Specialist at Chegg. She has worked in digital marketing, libraries, and publishing.

Citation Guides

• Annotated Bibliography
• Block Quotes
• Citation Examples
• et al Usage
• In-text Citations
• Page Numbers
• Reference Page
• Sample Paper
• APA 7 Updates
• View APA Guide
• Bibliography
• MLA 8 Updates
• View MLA Guide

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An annotated bibliography is a list containing complete information of sources, such as journals, books, and reports, cited in the text. In addition, it provides a brief description of each source in about 100–150 words. The annotation can explain the topics covered in the source or evaluate the source. The main objective of giving the annotation is to provide the reader the importance, accuracy, and value of the source.

An example of an annotated bibliography in APA style is given below.

Lim, L. (2014). Ideology, rationality and reproduction in education: A critical discourse analysis. Discourse: Studies in the Cultural Politics of Education, 35 (1), 61–76. https://doi:10.1080/01596306.2012.739467

Lim (2014) focuses on issues of power and ideology dominant in curricular discourses of rationality to study a discourse analysis of the goals of one of the most important curricula in the teaching of thinking. He proves that political and class commitments are reproduced in the forms of thinking that are valued in societies. Through his research, Lim asserts that such curricula engage in making our understanding of what thinking and rationality are. It must facilitate the social reproduction of a specific proportion of the middle class.

If you want to evaluate or provide a description of a source you are citing, you can create an annotated bibliography. Write your annotation in 100–150 words and add it below the source for which you are providing your annotation. Remember, your annotation should provide the reader the importance, accuracy, and value of the source. Below are the guidelines and rules to be followed while writing an annotated bibliography for APA style:

Order your reference entries in alphabetical order, similar to how you would order entries in the reference list.

If you want to add an annotation to an entry, add it as a fresh paragraph below the reference entry. The annotation is indented 0.5 inches from the left margin. However, the first line of the annotation is not indented.

To format the annotated bibliography, follow the recommendations given below:

Set the left, right, top, and bottom margins to 1 inch.

Give double-line spacing.

Title the page “Annotated Bibliography.” Set it in bold.

The title should be aligned to the center of the page.

As you format reference entries, left-align all references in the annotated bibliography section. If any entry runs over more than a line, indent the subsequent lines 0.5 inch from the left margin.

Arrange all reference entries alphabetically according to the surname of the authors.

Provide your annotations below the reference entry for which you want to give your annotation. Indent annotations 0.5 inches from the left margin.

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Annotated Bibliography Breakdown

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Stem Cell Research: An Annotated Bibliography

Holland, Suzanne. The Human Embryonic Stem Cell Debate: Science, Ethics, and Public Policy . Boston: MIT P, 2001.

This is the annotation of the above source, which is formatted according to MLA 2016 (8 th ed.) guidelines for the bibliographic information listed above. If one were really writing an annotation for this source, one would offer a brief summary of what this book says about stem cell research.

After a brief summary, it would be appropriate to assess this source and offer some criticisms of it. Does it seem like a reliable and current source? Why? Is the research biased or objective? Are the facts well documented? Who is the author? Is she qualified in this subject? Is this source scholarly, popular, some of both?

The length of your annotation will depend on the assignment or on the purpose of your annotated bibliography. After summarizing and assessing, you can now reflect on this source. How does it fit into your research? Is this a helpful resource? Too scholarly? Not scholarly enough? Too general/specific? Since "stem cell research" is a very broad topic, has this source helped you to narrow your topic?

Senior, K. "Extending the Ethical Boundaries of Stem Cell Research." Trends in Molecular Medicine , vol. 7, 2001, pp. 5-6.

Not all annotations have to be the same length. For example, this source is a very short scholarly article. It may only take a sentence or two to summarize. Even if you are using a book, you should only focus on the sections that relate to your topic.

Not all annotated bibliographies assess and reflect; some merely summarize. That may not be the most helpful for you, but, if this is an assignment, you should always ask your instructor for specific guidelines.

Wallace, Kelly. "Bush Stands Pat on Stem Cell Policy." CNN . 13 Aug. 2001.

Using a variety of sources can help give you a broader picture of what is being said about your topic. You may want to investigate how scholarly sources are treating this topic differently than more popular sources. But again, if your assignment is to only use scholarly sources, then you will probably want to avoid magazines and popular web sites.

The bibliographic information above is proper MLA format (use whatever style is appropriate in your field) and the annotations are in paragraph form. Note also that the entries are alphabetized by the first word in the bibliographic entry. If you are writing an annotated bibliography with many sources, it may be helpful to divide the sources into categories. For example, if putting together an extensive annotated bibliography for stem cell research, it might be best to divide the sources into categories such as ethical concerns, scholarly analyses, and political ramifications.

For more examples, a quick search at a library or even on the Internet should produce several examples of annotated bibliographies in your area.

Annotated Bibliographies

• Definition and Purpose
• How to Make Annotated Bibliographies

Example Annotated Bibliography

•  Each reference in your bibliography follows the rules for your citation style, such as APA style.
•  Your notes for each reference come immediately after your reference. Your notes are indented so that each citation is easy to find.
•  The references in your bibliography appear in the same order they would in the reference list at the end of your paper. In APA style, that means that they are listed in alphabetical order by the first author’s last name.
•  Explain why each reference is useful for your paper.
•  Include specific data, facts, or other unique information you want to use in your paper.
•  Include limitations of each source.
•  You might notice some themes in what you are writing. Or, you might notice that different sources conflict. These themes and conflicts will be useful for organizing your literature review when you write your paper.

This study shows the complexity of identifying risk factors and, unlike other studies, closely examines the roles of obesity and birth weight. In this large cohort study of people in Britain, the researchers examined the roles of several demographic factors as well as a few different measures of weight and BMI changes. This study did not see a link between low birth weight and the risk of developing diabetes unless changes in BMI were also taken into account. The interplay between low birth weight and changes in BMI over time was a significant risk factor for developing diabetes. Other notable findings were that it mattered when people became obese; people who became obese as teenagers were at higher risk than people who became obese later in life. The study had several important limitations to note. First, the number of participants dropped drastically over time; they had an 82.4% drop-out rate over the 50 years of the study. Although they used statistical methods to estimate missing data and were careful to compare like timespans with like timespans, this lack of data could skew the results. The second major limitation is that the authors did not distinguish between different types of diabetes. Other limitations were more minor. Based on what the authors share about how they calculated another factor, which did not end up being significant, it is unclear if only people with married mothers were included in the study. The authors used the changes in BMI between the different data collection periods to estimate the average age of onset, but the data collection points were not evenly spaced and the authors did not explain why they collected data at those points in time instead of others. Again, that information could skew the data. In spite of its limitations, this article shows how no one factor alone can predict if a person will develop diabetes. It can be a caution in assigning too much importance to specific measures.

Ivarsdottir, E. V., Steinthorsdottir, V., Daneshpour, M. S., Thorleifsson, G., Sulem, P., Holm, H., Sigurdsson, S., Hreidarsson, A. B., Siggurdson, G., Bjarnason, R., Thorsson, A. V., Benediktsson, R., Eyjolfsson, G., Sigurdardottir, O., Zeinali, S., Azizi, F., Thorsteinsdottier, U., Gudbjartsson, D. F., & Stefansson, K. (2017). Effect of sequence variants on variance in glucose levels predicts type 2 diabetes risk and accounts for heritability. Nature Genetics , 49 (9), 1398-1402. https://doi.org/10.1038/ng.3928

In this study, the authors investigated the relationship between genetic variants that are known to affect blood glucose levels to see if they were also associated with type 2 diabetes. In addition to looking for differences between specific people, the authors also accounted for differences between samples taken from a single individual. The real value of this article is in the supplementary materials the authors shared. The authors included a copy of the code they used to calculate the differences between all of their samples. It can be modified to be used with other genetic traits. In addition, the authors also linked out to a set of open access genetic data sets for type 2 diabetes research. Both sets of information make this article super useful for additional genetic research.

Min, D., & Cho, E. (2018). Associations among health behaviors, body mass index, hypertension, and diabetes mellitus: A path analysis. Medicine , 97 (22), Article e10981. https://doi.org/10.1097/md.0000000000010981

Using existing data from a study of aging in Korea, this study identified specific risk factors for developing type 2 diabetes for people who have lower-than-normal weight levels or higher-than-normal weight levels. They looked at correlations between several dietary behaviors, exercise, demographic factors, and changes in body-mass index (BMI). Overall, they found a 2.4% incidence rate for diabetes in their study population, which consisted of middle-aged and older people in Korea who had not previously been diagnosed with diabetes. Regardless of weight, increases in a person’s BMI correlated with higher risk of developing diabetes. For people who were underweight, eating regular meals played a complex role; it was associated with a lower chance of developing type 2 diabetes, but also with increasing the person’s BMI. The study is helpful because it shows the complexity of identifying risk factors for developing type 2 diabetes and deciding what factors might be appropriate targets for public health programs. Rather than focusing on a single potential risk factor, this study looked at the interplay between several possible risk factors, which means the results reflect reality more closely. The study is limited in that the number of people studied was relatively small (a few thousand) and only a small portion of that group were underweight (about 130 people.) It is unclear if the results would hold for the larger population or for a different population.

Muller, N., Heller, T., Freitag, M. H., Gerste, B., Haupt, C. M., Wolf, G., & Muller, U. A. (2015). Healthcare utilization of people with type 2 diabetes in Germany: An analysis based on health insurance data. Diabetic Medicine , 32 (7), 951-957. https://doi.org/10.1111/dme.12747

This study demonstrates the high costs associated with having type 2 diabetes for both the individual and for insurance companies. It helps establish the argument that diabetes should be a public health priority and a priority for policy-makers and insurance companies. In addition, this study clearly showed that age correlates with both diabetes incidence and prevalence. This study looked at health-care related costs in insurance data for people in Germany who used the most common German insurance provider at the time. Based on that data, the researchers found that nearly 34% of people who had type 2 diabetes had secondary diabetes-related conditions. In addition, people with type 2 diabetes were more likely to use healthcare services on both outpatient and in-patient bases. People with type 2 diabetes were twice as likely to be admitted to the hospital and, when taking both outpatient and inpatient information into account, stayed at the hospital three times as long as people without any form of diabetes. (The researchers had excluded people with type 1 diabetes and gestational diabetes from their sample.) The researchers did not include standard deviations or confidence intervals; the data may not be fully representative. The data used in this study was collected in 2010; newer data might show different trends. The study’s findings may not be generalizable to other areas of the world due to differences in diabetes’ prevalence and incidence, the health care structures in place, and environmental factors. It still indicates that diabetes can be an expensive disease. In spite of some limitations, the information in this article suggests that targeting diabetes could have wide benefits.

Wang, T., Huang, T., Li, Y., Zheng, Y., Manson, J. E., Hu, F. B., & Qi, L. (2016). Low birthweight and risk of type 2 diabetes: A Mendelian randomisation study. Diabetologia , 59 (9), 1920-1927. https://doi.org/10.1007/s00125-016-4019-z

In this meta-analysis, the researchers pooled longitudinal data about two studies of healthcare workers in the United States to evaluate the connection between genetic differences and risk of developing diabetes. Building on a study that showed certain genetic variants increased the likelihood that a person would have a low birth weight, this study examined participant’s genetic make-up to determine their likelihood of having a low birth weight and then investigated how many people with each variation had diabetes at the end of the study. Overall, these calculated risk factors did correlate with increased risk of developing diabetes; having a higher risk factor increased the chances that the person would develop diabetes. However, only two of the five variants the authors considered correlated with increased risk of developing diabetes and they did not include the variant that had the strongest correlation to having a low birth weight. Even when taking into account other behavioral and demographic factors, genetic makeup was a significant risk factor for diabetes. This reinforces the idea that diabetes has several interacting causes. That said, the authors were only looking at people in the U.S. with European heritage; different populations might have different results. This study is important because it shows that social and behavioral factors are not the sole causes for diabetes; traditional public health programs cannot completely eliminate diabetes. In addition, the study’s results might explain some of why people with similar outward appearances or behaviors have different outcomes.

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