The inter-relationship between diet, selflessness, and disordered eating in Australian women

Disordered eating and the meat-avoidance spectrum: a systematic review and clinical implications

PURPOSE

Meat avoidance has long been thought to be related to eating psychopathology; however, research does not necessarily support this notion. Furthermore, commonly used eating disorder scales may be picking up on normal meat-avoiding behaviours in vegetarians and vegans. As such, we systematically reviewed the association between vegetarianism, veganism, and disordered eating, and reviewed the psychometric properties of eating disorder scales for use in these populations.

METHODS

We searched electronic databases MEDLINE, PsychINFO, and CINAHL for literature published until June 2021.

RESULTS

Forty-eight studies met eligibility criteria, with no consensus as to whether meat avoidance was associated with higher rates of disordered eating. Most studies reported a significant positive association with both vegetarianism and veganism, and orthorexia nervosa. Six studies provided evidence for the use of eating disorder measures in vegetarians and vegans, reporting poor psychometric fit among all scales.

CONCLUSION

This systematic review highlights the extent to which vegetarians and vegans have been highly understudied, with limited research suggesting higher levels of orthorexia nervosa behaviours in vegetarians and vegans. Furthermore, our results provide tentative evidence that the factorial validity of commonly used eating disorder scales, such as the EDE-Q, may be poor in vegans.

LEVEL OF EVIDENCE

Level I, systematic review.

Associations of self-repression with disordered eating and symptoms of other psychopathologies for men and women

BACKGROUND

Disordered eating has been found to be associated with constructs involving self-repression, such as selflessness (the tendency to relinquish one's needs for others'), and concern for appropriateness (an alertness to information about social comparison and tendency to vary one's behavior in different social situations). This study aimed to examine associations between these self-repression variables and symptoms of general psychopathology for women and men in a community sample.

METHODS

Two hundred and thirty-six participants (92 men) aged 18-76 (M = 29.11 ± 10.10) volunteered to complete online measures of disordered eating, concern for appropriateness (cross-situational variability and attention to social comparison information), selflessness, and symptoms of depression, anxiety and somatization. Structural equation models were built to assess pathways between the study variables for men and women separately.

RESULTS

A MANOVA 2*7 design showed that women scored significantly higher than men on measures of selflessness, disordered eating and depression. For men, selflessness scores were positively and significantly associated only with depression scores. Cross-situational variability scores were positively associated with depression, somatization and anxiety scores. For women, selflessness scores were positively and significantly associated with depression, disordered eating, somatization and anxiety scores. Cross-situational variability scores were positively and significantly associated with depression, anxiety and somatization scores but not with disordered eating scores. Attention to Social Comparison Information scores were positively and significantly associated only with disordered eating scores.

CONCLUSIONS

Self-repression is more closely linked to psychopathology in women than in men. For men, self-suppression seems to be associated with symptoms of internalizing disorders, but not disordered eating. Even for women, it appears that self-repression is not connected exclusively with disordered eating, but with symptoms of psychopathology in general. Future research should explore why self-suppression plays such a central role in women's psychopathology.

Using machine learning to explore core risk factors associated with the risk of eating disorders among non-clinical young women in China: A decision-tree classification analysis

BACKGROUND

Many previous studies have investigated the risk factors associated with eating disorders (EDs) from the perspective of emotion regulation (ER). However, limited research has investigated interactions between co-existing risk factors for EDs, especially in China where research in EDs is underrepresented.

METHODS

This study examined core risk factors related to maladaptive eating behaviors and ER, and how their interactions affect the detection of EDs. Using machine learning, a decision tree model was constructed on a data set of 830 non-clinical Chinese young women with an average age of 18.91 years (SD = 0.95). The total data set was split into training and testing data sets with a ratio of 70 to 30%.

RESULTS

Body image inflexibility was identified as the major classifier for women at high risk of EDs. Furthermore, interactions between body image inflexibility, psychological distress, and body dissatisfaction were important in detecting women at high risk of EDs. Overall, the model classifying women at high-risk for EDs had a sensitivity of 0.88 and a specificity of 0.85 when applied to the testing data set.

CONCLUSIONS

Body image inflexibility, psychological distress, and body dissatisfaction were identified as the major classifiers for young women in China at high risk of EDs. Researchers and practitioners may consider these findings in the screening, prevention, and treatment of EDs among young women in China.

The inter-relationship between diet, selflessness, and disordered eating in Australian women

Personality traits and diet can be used to predict if a person is predisposed to disordered eating. Results of this study demonstrate a strong significant relationship between the personality trait of selflessness, diet group, and disordered eating. Vegans were most likely to display selflessness tendencies associated with disordered eating; however when selflessness was controlled for, vegans displayed substantially less disordered eating pathology than non-vegetarians.

OBJECTIVE

To explore the relationship between diet group (non-vegetarian, semi-vegetarian, true-vegetarian, and vegan) and disordered eating while investigating to what extent personality trait of selflessness mediates the relationship between diet group and disordered eating.

METHOD

Cross-sectional data from 634 Australian nonclinical women who completed a series of online questionnaires including measures of diet group, disordered eating, and selflessness were used to examine associations between diet, personality (selflessness), and disordered eating.

RESULTS

Selflessness was found to be a significant positive predictor of disordered eating. Results confirm that selflessness played a suppressing role in the relationship between the vegan diet group and disordered eating, when compared to non-vegetarians. Surprisingly, vegans displayed significantly less disordered eating than non-vegetarians and semi-vegetarians.

DISCUSSION

Results of the current study imply that the role of selflessness on disordered eating, when broken down across diet group, may be more complex than first thought. If replicated, these results suggest that targeted treatment of selflessness in different diet groups may improve treatment outcomes for disordered eating. Further research should explore why diet groups differ in terms of selflessness and how this impacts disordered eating.