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Jason Lillis

Biographic Data

ID316162
NAMEJason Lillis
GIVEN NAMESJason
FAMILY NAMELillis
SIGNATURELILLIS J
AFFILIATIONSUniversity of Nevada, Reno
ORCID0000-0002-0884-8730
VERIFIEDYes
TOTAL WORKS20
TOTAL CITATIONS22
AUTHOR COUNT20
EDITOR COUNT0
FIRST PUBLICATION YEAR2006
LATEST PUBLICATION YEAR2025
H-INDEX3
  • An individual participant data meta-analysis investigating the mediating role of eating behavior traits in Acceptance and Commitment Therapy-based weight management interventions

    Open Access•Laura Kudlek, Julia Mueller et al.•ARTICLE•Annals of Behavioral Medicine•2025•Cited by: 1•References: 80

  • HIV Status, Obesity, and Risk for Weight Stigma

    Open Access•Emily Panza, Jason Lillis et al.•ARTICLE•AIDS and Behavior•2021

  • Confirmatory factor analysis of the Acceptance and Action Questionnaire for Weight-Related Difficulties-Revised (Aaqw-R) in a United States sample of adults with overweight and obesity

    Open Access•Cara Dochat, Niloofar Afari et al.•ARTICLE•Journal of Contextual Behavioral…•2020

  • Characterizing Lifetime and Daily Experiences of Weight Stigma among Sexual Minority Women with Overweight and Obesity

    Open Access•Emily Panza, KayLoni L Olson et al.•ARTICLE•International Journal of…•2020

    Sexual minority women are disproportionately impacted by obesity yet are underrepresented in weight stigma research. This Ecological Momentary Assessment (EMA) study is a secondary analysis that aimed to elucidate the frequency and contextual characteristics of perceived experiences of lifetime and momentary weight stigma among sexual minority women with overweight/obesity. Participants were 55 sexual minority women ages 18-60 with a body mass in…

  • Self-stigma and weight loss

    Open Access•Jason Lillis, J Graham Thomas et al.•ARTICLE•Journal of Health Psychology•2020•Cited by: 4•References: 22

    This study sought to examine whether two facets of weight self-stigma (fear of enacted stigma and self-devaluation) were associated with weight change and treatment engagement for 188 individuals participating in a 3-month online weight loss program. Fear of enacted stigma predicted less weight loss 3 months later after controlling for demographics, eating problems, and psychological symptoms. Self-devaluation did not predict weight loss. Neither…

  • Assessing the valuing process in Acceptance and Commitment Therapy

    Open Access•Jennifer L Barney, Jason Lillis et al.•ARTICLE•Journal of Contextual Behavioral…•2018

  • Exploring process variables through which acceptance-based behavioral interventions may improve weight loss maintenance

    Open Access•Jason Lillis, J Graham Thomas et al.•ARTICLE•Journal of Contextual Behavioral…•2017

  • New developments in the assessment of weight-related experiential avoidance (Aaqw-Revised)

    Open Access•Lara Palmeira, Marina Cunha et al.•ARTICLE•Journal of Contextual Behavioral…•2016

  • Weight loss intervention for individuals with high internal disinhibition

    Open Access•Jason Lillis, Heather M Niemeier et al.•ARTICLE•BMC Psychology•2015

    ClinicalTrials.gov, NCT01461421 (registered October 25, 2011)

  • Acceptance and Commitment Therapy for weight control

    Jason Lillis, Kathleen Kendra et al.•ARTICLE•Journal of Contextual Behavioral…•2014

  • The Acceptance and Action Questionnaire – Stigma (AAQ-S)

    Michael E Levin, Jason B Luoma et al.•ARTICLE•Journal of Contextual Behavioral…•2013

  • Acceptance and commitment therapy.

    Steven C Hayes, Jason Lillis•BOOK•Acceptance and commitment therapy•2012

  • The Impact of Treatment Components Suggested by the Psychological Flexibility Model

    Open Access•Michael E Levin, Mikaela J Hildebrandt et al.•ARTICLE•Behavior Therapy•2012

  • Exploring the relationship between body mass index and health-related quality of life

    Open Access•Jason Lillis, Michael E Levin et al.•ARTICLE•Journal of Health Psychology•2011•Cited by: 10•References: 24

    Health-related quality of life (HRQL) has been shown to deteriorate as body mass index (BMI) increases. Recent research suggests weight stigma and experiential avoidance may partially account for the relationship between BMI and HRQL. Eighty-seven adults recruited from a weight-loss clinic completed an intake assessment, which consisted of physical measurement taking and completion of self-report measures. Experiential avoidance and weight self-s…

  • Measuring Weight Self‐stigma

    Open Access•Jason Lillis, Jason B Luoma et al.•ARTICLE•Obesity•2010

    Stigma associated with being overweight or obese is widespread. Given that weight loss is difficult to achieve and maintain, researchers have been calling for interventions that reduce the impact of weight stigma on life functioning. Sound measures that are sensitive to change are needed to help guide and inform intervention studies. This study presents the weight self‐stigma questionnaire (WSSQ). The WSSQ has 12 items and is designed for use onl…

  • Teaching Acceptance and Mindfulness to Improve the Lives of the Obese

    Jason Lillis, Steven C Hayes et al.•ARTICLE•Annals of Behavioral Medicine•2009

    BACKGROUND: Obesity is a growing epidemic. Weight control interventions can achieve weight loss, but most is regained over time. Stigma and low quality of life are significant problems that are rarely targeted. PURPOSE: A new model aimed at reducing avoidant behavior and increasing psychological flexibility, has shown to be relevant in the treatment of other chronic health problems and is worth examining for improving the lives of obese persons. …

  • Comparing Japanese International College Students' and U.S. College Students' Mental‐Health‐Related Stigmatizing Attitudes

    Open Access•Akihiko Masuda, Steven C Hayes et al.•ARTICLE•Journal of Multicultural…•2009•Cited by: 6•References: 23

    This study examined differences between Japanese international college students and U.S. college students on stigma toward people with psychological disorders, stigma tolerance in help seeking, and self‐concealment. Japanese international students had greater stigma toward individuals with psychological disorders than did their U.S. counterparts. No interrelationships between these variables, however, were found in the Japanese international stud…

  • Avoidance and Inflexibility as a Common Clinical Pathway in Obesity and Smoking Treatment

    Open Access•Elizabeth V Gifford, Jason Lillis•ARTICLE•Journal of Health Psychology•2009•Cited by: 1•References: 17

    This brief study presents reductions in avoidance and inflexibility as a potential common clinical pathway to intervene on for both smoking cessation and weight control. A mediation analysis-using the Avoidance and Inflexibility Scale (AIS)-was conducted on a group of participants ( N = 84) who were shown to improve weight control outcomes after receiving an Acceptance and Commitment Therapy (ACT) intervention. Results were then compared to a pre…

  • The Relation between Psychological Flexibility and Mental Health Stigma in Acceptance and Commitment Therapy

    Open Access•Akihiko Masuda, Steven C Hayes et al.•ARTICLE•Behavior and Social Issues•2009•References: 48

  • Acceptance and Commitment Therapy

    Open Access•Steven C Hayes, Jason B Luoma et al.•ARTICLE•Behaviour Research and Therapy•2006

  • Exploring the relationship between body mass index and health-related quality of life

    Open Access•Jason Lillis, Michael E Levin et al.•ARTICLE•Journal of Health Psychology•2011•Cited by: 10•References: 24

    Health-related quality of life (HRQL) has been shown to deteriorate as body mass index (BMI) increases. Recent research suggests weight stigma and experiential avoidance may partially account for the relationship between BMI and HRQL. Eighty-seven adults recruited from a weight-loss clinic completed an intake assessment, which consisted of physical measurement taking and completion of self-report measures. Experiential avoidance and weight self-s…

  • Comparing Japanese International College Students' and U.S. College Students' Mental‐Health‐Related Stigmatizing Attitudes

    Open Access•Akihiko Masuda, Steven C Hayes et al.•ARTICLE•Journal of Multicultural…•2009•Cited by: 6•References: 23

    This study examined differences between Japanese international college students and U.S. college students on stigma toward people with psychological disorders, stigma tolerance in help seeking, and self‐concealment. Japanese international students had greater stigma toward individuals with psychological disorders than did their U.S. counterparts. No interrelationships between these variables, however, were found in the Japanese international stud…

  • Self-stigma and weight loss

    Open Access•Jason Lillis, J Graham Thomas et al.•ARTICLE•Journal of Health Psychology•2020•Cited by: 4•References: 22

    This study sought to examine whether two facets of weight self-stigma (fear of enacted stigma and self-devaluation) were associated with weight change and treatment engagement for 188 individuals participating in a 3-month online weight loss program. Fear of enacted stigma predicted less weight loss 3 months later after controlling for demographics, eating problems, and psychological symptoms. Self-devaluation did not predict weight loss. Neither…

  • An individual participant data meta-analysis investigating the mediating role of eating behavior traits in Acceptance and Commitment Therapy-based weight management interventions

    Open Access•Laura Kudlek, Julia Mueller et al.•ARTICLE•Annals of Behavioral Medicine•2025•Cited by: 1•References: 80

  • Avoidance and Inflexibility as a Common Clinical Pathway in Obesity and Smoking Treatment

    Open Access•Elizabeth V Gifford, Jason Lillis•ARTICLE•Journal of Health Psychology•2009•Cited by: 1•References: 17

    This brief study presents reductions in avoidance and inflexibility as a potential common clinical pathway to intervene on for both smoking cessation and weight control. A mediation analysis-using the Avoidance and Inflexibility Scale (AIS)-was conducted on a group of participants ( N = 84) who were shown to improve weight control outcomes after receiving an Acceptance and Commitment Therapy (ACT) intervention. Results were then compared to a pre…

  • Acceptance and Commitment Therapy

    Open Access•Steven C Hayes, Jason B Luoma et al.•ARTICLE•Behaviour Research and Therapy•2006

  • Teaching Acceptance and Mindfulness to Improve the Lives of the Obese

    Jason Lillis, Steven C Hayes et al.•ARTICLE•Annals of Behavioral Medicine•2009

    BACKGROUND: Obesity is a growing epidemic. Weight control interventions can achieve weight loss, but most is regained over time. Stigma and low quality of life are significant problems that are rarely targeted. PURPOSE: A new model aimed at reducing avoidant behavior and increasing psychological flexibility, has shown to be relevant in the treatment of other chronic health problems and is worth examining for improving the lives of obese persons. …

  • Comparing Japanese International College Students' and U.S. College Students' Mental‐Health‐Related Stigmatizing Attitudes

    Open Access•Akihiko Masuda, Steven C Hayes et al.•ARTICLE•Journal of Multicultural…•2009•Cited by: 6•References: 23

    This study examined differences between Japanese international college students and U.S. college students on stigma toward people with psychological disorders, stigma tolerance in help seeking, and self‐concealment. Japanese international students had greater stigma toward individuals with psychological disorders than did their U.S. counterparts. No interrelationships between these variables, however, were found in the Japanese international stud…

  • Avoidance and Inflexibility as a Common Clinical Pathway in Obesity and Smoking Treatment

    Open Access•Elizabeth V Gifford, Jason Lillis•ARTICLE•Journal of Health Psychology•2009•Cited by: 1•References: 17

    This brief study presents reductions in avoidance and inflexibility as a potential common clinical pathway to intervene on for both smoking cessation and weight control. A mediation analysis-using the Avoidance and Inflexibility Scale (AIS)-was conducted on a group of participants ( N = 84) who were shown to improve weight control outcomes after receiving an Acceptance and Commitment Therapy (ACT) intervention. Results were then compared to a pre…

  • The Relation between Psychological Flexibility and Mental Health Stigma in Acceptance and Commitment Therapy

    Open Access•Akihiko Masuda, Steven C Hayes et al.•ARTICLE•Behavior and Social Issues•2009•References: 48

  • Measuring Weight Self‐stigma

    Open Access•Jason Lillis, Jason B Luoma et al.•ARTICLE•Obesity•2010

    Stigma associated with being overweight or obese is widespread. Given that weight loss is difficult to achieve and maintain, researchers have been calling for interventions that reduce the impact of weight stigma on life functioning. Sound measures that are sensitive to change are needed to help guide and inform intervention studies. This study presents the weight self‐stigma questionnaire (WSSQ). The WSSQ has 12 items and is designed for use onl…

  • Exploring the relationship between body mass index and health-related quality of life

    Open Access•Jason Lillis, Michael E Levin et al.•ARTICLE•Journal of Health Psychology•2011•Cited by: 10•References: 24

    Health-related quality of life (HRQL) has been shown to deteriorate as body mass index (BMI) increases. Recent research suggests weight stigma and experiential avoidance may partially account for the relationship between BMI and HRQL. Eighty-seven adults recruited from a weight-loss clinic completed an intake assessment, which consisted of physical measurement taking and completion of self-report measures. Experiential avoidance and weight self-s…

  • Acceptance and commitment therapy.

    Steven C Hayes, Jason Lillis•BOOK•Acceptance and commitment therapy•2012

  • The Impact of Treatment Components Suggested by the Psychological Flexibility Model

    Open Access•Michael E Levin, Mikaela J Hildebrandt et al.•ARTICLE•Behavior Therapy•2012

  • The Acceptance and Action Questionnaire – Stigma (AAQ-S)

    Michael E Levin, Jason B Luoma et al.•ARTICLE•Journal of Contextual Behavioral…•2013

  • Acceptance and Commitment Therapy for weight control

    Jason Lillis, Kathleen Kendra et al.•ARTICLE•Journal of Contextual Behavioral…•2014

  • Weight loss intervention for individuals with high internal disinhibition

    Open Access•Jason Lillis, Heather M Niemeier et al.•ARTICLE•BMC Psychology•2015

    ClinicalTrials.gov, NCT01461421 (registered October 25, 2011)

  • New developments in the assessment of weight-related experiential avoidance (Aaqw-Revised)

    Open Access•Lara Palmeira, Marina Cunha et al.•ARTICLE•Journal of Contextual Behavioral…•2016

  • Exploring process variables through which acceptance-based behavioral interventions may improve weight loss maintenance

    Open Access•Jason Lillis, J Graham Thomas et al.•ARTICLE•Journal of Contextual Behavioral…•2017

  • Assessing the valuing process in Acceptance and Commitment Therapy

    Open Access•Jennifer L Barney, Jason Lillis et al.•ARTICLE•Journal of Contextual Behavioral…•2018

  • Confirmatory factor analysis of the Acceptance and Action Questionnaire for Weight-Related Difficulties-Revised (Aaqw-R) in a United States sample of adults with overweight and obesity

    Open Access•Cara Dochat, Niloofar Afari et al.•ARTICLE•Journal of Contextual Behavioral…•2020

  • Characterizing Lifetime and Daily Experiences of Weight Stigma among Sexual Minority Women with Overweight and Obesity

    Open Access•Emily Panza, KayLoni L Olson et al.•ARTICLE•International Journal of…•2020

    Sexual minority women are disproportionately impacted by obesity yet are underrepresented in weight stigma research. This Ecological Momentary Assessment (EMA) study is a secondary analysis that aimed to elucidate the frequency and contextual characteristics of perceived experiences of lifetime and momentary weight stigma among sexual minority women with overweight/obesity. Participants were 55 sexual minority women ages 18-60 with a body mass in…

  • Self-stigma and weight loss

    Open Access•Jason Lillis, J Graham Thomas et al.•ARTICLE•Journal of Health Psychology•2020•Cited by: 4•References: 22

    This study sought to examine whether two facets of weight self-stigma (fear of enacted stigma and self-devaluation) were associated with weight change and treatment engagement for 188 individuals participating in a 3-month online weight loss program. Fear of enacted stigma predicted less weight loss 3 months later after controlling for demographics, eating problems, and psychological symptoms. Self-devaluation did not predict weight loss. Neither…

  • HIV Status, Obesity, and Risk for Weight Stigma

    Open Access•Emily Panza, Jason Lillis et al.•ARTICLE•AIDS and Behavior•2021

  • An individual participant data meta-analysis investigating the mediating role of eating behavior traits in Acceptance and Commitment Therapy-based weight management interventions

    Open Access•Laura Kudlek, Julia Mueller et al.•ARTICLE•Annals of Behavioral Medicine•2025•Cited by: 1•References: 80

Psychology (18 works) · Psychiatry (17 works) · Eating Disorders and Behaviors (11 works) · Medicine (11 works) · Obesity (11 works) · Acceptance and commitment therapy (10 works) · Clinical Psychology (10 works) · Mindfulness and Compassion Interventions (10 works) · Obesity and Health Practices (10 works) · Clinical Psychology (9 works)

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