Current trends and future directions in internalized weight stigma research: a scoping review and synthesis of the literature
Authors: Nutter Sarah , Saunders Jessica F. , Waugh Rachel 
Published: July 2024

Abstract
Background
Since the first papers focused on internalized weight stigma were published in the mid 2000’s, the literature has grown into a robust field that complements existing knowledge on weight stigma. Recently, researchers have documented the need for increased conceptual and measurement clarity, to distinguish internalized weight stigma from body dissatisfaction. Although several systematic reviews have been conducted on portions of the internalized weight stigma literature, no review to date has been conducted examining the entirety of the literature.

Objective
The aim of this research was to conduct a systematic scoping review and synthesis of research on internalized weight stigma. Specifically, we sought to examine the broad scope of the literature, terms used to refer to internalized weight stigma, how internalized weight stigma is defined, sample characteristics, and weight-based framings of internalized weight stigma research.

Methods
We conducted a single-concept search across six databases (EMBASE, Medline, PsychINFO, PubMed, SCOPUS, and Web of Science) of peer-reviewed papers published in English on internalized weight stigma. Data were extracted for article authors, year published, journal name and type, general article topic(s), study design, study location, sample characteristics, variables measured, paper framing, term used to describe internalized weight stigma, and definition of internalized weight stigma.

Results
Of the 931 unique records screened, 376 were identified for inclusion in the scoping review. The majority of internalized weight stigma research is characterized by cross-sectional methods, has been conducted in the US, and has utilized samples of higher weight white women. Further, 40 unique terms were used across the literature to refer to internalized weight stigma, and 19 different components of definitions of internalized weight stigma were identified. The literature is also characterized by a focus on understanding the association between internalized weight stigma and health outcomes with an emphasis on obesity.

Conclusions
This scoping review confirms a lack of concept clarity of internalized weight stigma, in part influenced by an inconsistency in definitions of internalized weight stigma across the literature. Considerations are provided for steps to enhance conceptual and measurement clarity. Given the obesity focused framing of much of the research on internalized weight stigma, considerations are also provided for reducing weight-centric approaches to research.

Plain english summary
In the early 2000’s, researchers began to pay more attention to the potential health impacts of believing societal stereotypes, negative attitudes, and beliefs about higher weight people. When these stereotypes, negative attitudes, and beliefs are directed towards the self, it can have significant consequences for an individual’s perceptions of self. This research collected and summarized all existing research published in English on internalized weight stigma. Our results highlighted that researchers do not use consistent terminology to refer to internalized weight stigma and that they do not have a consistent definition of internalized weight stigma. Further, a large proportion of the research is focused on obesity or weight loss, which may unintentionally perpetuate weight stigma in scientific research. We provide several recommendations for researchers to address these challenges in future research on internalized weight stigma as well as recommendations to address other identified gaps in the existing literature.