Beyond generalized anxiety: the association of anxiety sensitivity with disordered eating

Background Anxiety and eating disorders (EDs) are rising at alarming rates. These mental health disorders are often comorbid, yet the factors associated with their comorbidity are not well understood. The present study examined a theoretical model of the pathways and relative associations of anxiety sensitivity (AS) with different dimensions of ED risk, controlling for generalized anxiety. Methods Participants (N = 795) were undergraduate students with an average age of 21 (SD = 4.02), predominantly female (71%), and Hispanic (71.8%). Participants completed an online survey with established measures of AS (i.e., Anxiety Sensitivity Index-3; ASI-3), general anxiety (i.e., Beck Anxiety Inventory; BAI), and eating behaviors (i.e., Eating Attitudes Test-26; EAT-26). Results The results of our structural equation models indicated that AS subscales were significantly associated with dimensions of the EAT-26, even when controlling for generalized anxiety. Specifically, the ASI-3 factors reflecting cognitive and social concerns provided the most consistent significant associations with EDs. Whereas reporting higher cognitive concerns was associated with higher ED symptoms (e.g., reporting the urge to vomit after a meal), reporting higher social concerns was associated with fewer ED symptoms. These differential results may suggest risk and resilience pathways and potential protective or buffering effects of social concerns on ED risk. Discussion Findings advance understanding of the role of AS in the comorbidity of anxiety and EDs, demonstrating the strong association of AS with ED pathology. These findings provide cognitive indicators for transdiagnostic therapeutic intervention in order to reduce the risk of EDs. Supplementary Information The online version contains supplementary material available at 10.1186/s40337-023-00890-0.


Introduction
Eating disorders (EDs) represent a serious and growing health concern affecting 9% of the population worldwide [1].Over the last two decades, the prevalence of EDs has risen from 3.5 to 7.8% [1].Moreover, EDs are associated with high rates of psychiatric comorbidity [2][3][4], with numerous studies demonstrating the comorbidity between anxiety and eating pathology [5][6][7][8][9][10][11].This is concerning, given that the lifetime prevalence of anxiety is approximately 33% [12] and also rising [13].Even more concerning is the estimate that 80% of EDs go undiagnosed, and 75% of individuals who have symptoms do not seek treatment [14,15].Therefore, it is important to understand the associations between anxiety and eating disorder risk, especially in non-clinically diagnosed populations.In the present study, we focus on how anxiety sensitivity (AS)-the fear of fear-might relate to eating disorder risk above and beyond more commonly studied measures of general anxiety.
Generalized anxiety disorder (GAD) is most commonly comorbid in individuals with EDs [9,26].The core feature of GAD, worry, is often elevated in individuals with EDs when compared with a non-clinical sample, and may play a role in eating symptomatology, representing a construct that is elevated in both diagnoses [27].Specifically, worry is associated with food and weight [28,29], eating pathology (e.g., fear of weight gain, inability to recover, engaging in ED behaviors like vomiting or exercise [30]; and may negatively impact the course of eating pathology relating to poorer treatment outcomes [9,31].Individuals with EDs who report comorbid anxiety problems, also report that symptoms of anxiety preceded the development of eating pathology in 60-90% of cases [32][33][34][35].However, anxiety disorders do not always precede eating pathology [32], and some researchers have argued that EDs may exacerbate anxiety symptomology [9].Nevertheless, anxiety is clearly one pathway in the genesis of eating pathology [33].Although the mechanisms by which anxiety impacts eating pathology are still unclear [32], the high prevalence of comorbidity demands further research to identify transdiagnostic, coactive processes, and points of intervention.Moreover, approaching EDs from a generalized anxiety perspective may not be the most effective at illuminating underlying mechanisms, as there are different aspects of anxiety that may affect behavior differently, and therefore, we examine AS.

Anxiety sensitivity and eating disorders
Anxiety sensitivity is related to but distinct from trait anxiety (or the tendency to experience anxiety across many situations and experiences) [34].A cognitive construct, AS is the belief that the physical sensations that accompany anxiety will lead to 'catastrophic outcomes' such as dangerous physical symptoms or social embarrassment [35,36].It is the feeling of dread associated with anxiety-related bodily sensations (e.g., racing heart, butterflies in the stomach, quivering hands, and feelings of loss of control over bodily sensations [37][38][39].Thus, AS is the fear of somatic arousal [40][41][42].Individuals who are high in AS tend to amplify and misinterpret bodily sensations and symptoms of anxiety [37,43,44].In moments of emotional distress, individuals may engage in maladaptive short-term affect regulation, and AS has been associated with heightened sensitivity to negative affect [45][46][47][48]. High levels of negative affect, related to AS, are a shared vulnerability in the emergence and maintenance of EDs and other internalizing disorders [49][50][51][52].Individuals who report disordered eating also have higher levels of AS [53], and tend to overeat in response to negative emotions [54].Higher levels of AS may lead to binge eating as a means to reduce emotional distress [55].When levels of AS are high, it may potentiate the aversiveness of negative affective or somatic states [45,46,56].Due to the heightened sensitivity of those negative emotions, individuals with AS may be more likely to engage in behavioral efforts to reduce their distress through maladaptive and pathological eating [56,57].Hearon and colleagues [40] found through ecological momentary assessment, that individuals with high levels of AS engaged in eating behaviors (i.e., calorie consumption) followed by high levels of negative affect.
The Anxiety Sensitivity Index-3 (ASI-3) [58] is an extensively used multidimensional measure of AS.The first dimension, cognitive concerns, refers to the fear of being mentally unable to control cognitions, the second one, physical concerns, focuses on the fear of experiencing the physiological symptoms related to anxiety, and the third dimension, social concerns, refers to the fear of one's symptoms being publicly observable [58].Little research to date has examined how the different dimensions of AS, (i.e., physical, social, and cognitive concerns) may differently predict EDs.One study showed that the cognitive concerns dimension of the AS, as measured by the ASI-3 [58] was significantly associated with disordered eating measured by the Eating Attitudes Test-26 (EAT-26) [59], suggesting that individuals high in this dimension may engage in maladaptive eating behaviors as a means to reduce the unwanted internal states, such as thoughts, emotions or physical symptoms [53].In individuals with a clinically diagnosed ED, all three dimensions of the ASI-3 [60] were positively correlated with the severity of ED symptomology.However, while controlling for comorbid psychopathology, only social and physical AS were related to ED symptoms.In that study, higher levels of social AS were related to elevated ED symptom severity, whereas higher physical AS was unexpectedly related to lower ED symptom severity.The authors [61] suggest that the negative association of physical AS on ED severity was a statistical suppression effect.Taken together, there is a clear association among AS and EDs.Understanding the differential pathways of association among dimensions of AS on ED outcomes is important because the experience of AS may relate to the heterogenous symptomology of EDs [62].

The present study
The rationale for this study was to go beyond prior research that has established associations between general anxiety and AS and EDs, by examining their unique contributions within the same model.Specifically, in this study, we examine the linkages among the three subscales of the ASI-3 [38] and their differential associations with four factors of disordered eating, after controlling for the associations with generalized anxiety.Broadly, if AS remains associated with eating disorder risk even after partialling out overlapping variance shared with general anxiety, this would support the idea that AS is a distinct and separable construct exhibiting potentially important incremental utility [63] in the eating disorder domain.We expected a-priori that the three AS constructs (i.e., physical, cognitive, and social concerns) will be associated with the EAT-26 above and beyond general anxiety.Figure 1 shows a general conceptual diagram of the anticipated regression of disordered eating on AS and generalized anxiety.

Participants
The sample comprised 795 undergraduate students, predominantly female (71%), with an average age of 21 (SD = 4.02), who were recruited through the Psychology department participation pool and volunteered to take part in an online survey in exchange for course credit for participation.Inclusion/exclusion criteria were: (1) over aged 18, (2) able to read English.Self-reported race/ethnicity: Hispanic (61.6%),African American (9.6%), White Non-Hispanic (7.4%),South Asian (e.g., Indian, Pakistani, 1.1%), Asian/Asian American (1.4%), Native American (0.1%), Other (4.9%), and no response (14%).Participants (73%) reported living with family and over half of the sample (51.5%) indicated an annual household income of less than $50,000.The sample was consistent with the characteristics of the major urban public research university and the surrounding community it serves.Physical characteristics reported by participants included height, range from 144.78 to 195.58 cm (M = 166.17cm, SD = 9.42 cm), and weight, range from 39.01 to 139.71 kg (M = 67.87kg, SD = 15.98 kg).Reported values were used to compute participants' body mass index (BMI; M = 24.96,SD = 5.13), which on average represented the ceiling of normal BMI.

Anxiety Sensitivity Index-3
Anxiety sensitivity was measured using the ASI-3 [58]; an 18-item version of the original ASI [38] assessing participants' concerns regarding arousal-related sensations across three dimensions with six items each: (1) cognitive concerns, (2) physical concerns, and (3) social concerns.Likert-type response scales ranged from 0 (very little) to 4 (very much).The total scale ranges from 0 to 72, and higher scores are indicative of higher sensitivity to arousal sensations.In the present sample, the average total score was 22.22 (SD = 16.65).Internal reliability was α = 0.89 for cognitive concerns, α = 0.84 for physical concerns, and α = 0.92 for social concerns.

Beck Anxiety Inventory
Anxiety was measured using the Beck Anxiety Inventory (BAI) [64], a 21-item scale designed to assess generalized symptoms of anxiety.It is comprised of two subscales: (1) somatic symptoms, and (2) subjective anxiety [68].Participants indicated how much they have been bothered in the past month by symptoms of anxiety on a 4-point Likert scale from 0 (not at all), to 3 (severely-it bothered me a lot).Total scores range from a low of 0 to a high of 63.Scores on the BAI are classified as minimal anxiety (0-7), mild anxiety (8)(9)(10)(11)(12)(13)(14)(15), moderate anxiety (16)(17)(18)(19)(20)(21)(22)(23)(24)(25), and severe anxiety .In the current sample, the average total score was 38.53 (SD = 14.99).Internal reliability was α = 0.93 for somatic symptoms subscale and α = 0.90 for subjective anxiety subscale.1 General, conceptual path diagram of the latent variable regression approach to incremental validity testing relating the anxiety sensitivity and general anxiety dimensions to eating disorder risk.Note: For ease of reading, the diagram omits exogenous variances and covariances and the endogenous disturbance.Ellipses, . . ., between factor model indicators suggest that additional indicators may load on each factor model (but are omitted to conserve space).Solid black vs solid grayscale lines are used to visually distinguish the regression model from the measurement models, respectively.Solid black one-headed arrows indicate regression paths

Eating Attitudes Test-26
The EAT-26 [59] was used to assess symptoms of disordered eating and ED symptomology in both non-clinical and clinical populations.An effective screening tool, it has a reported sensitivity of 90% when measured against clinical diagnostic interviewed based on DSM-IV criteria [65].However, some more recent studies have found insufficient to moderate sensitivity of the EAT-26 to detect full or partial EDs [66].The original structure of the EAT-26 consists of three subscales: (1) dieting, (2) bulimia and food preoccupation, and (3) oral control.Participants responded on a 6-point Likert scale with answer choices ranging from 1 (never) to 6 (always).Following Garner et al., [59], answers 1 through 25 are recoded for frequency to represent: 0 (never, rarely or sometimes), 1 (often), 2 (usually), and 3 (always), and question 26 is recoded using the reverse, such that higher scores indicate greater endorsement of disordered eating behaviors on each subscale.In the present sample, the average total score was 9.68 (SD = 9.15), close to the cutoff of 11 and above for risk of overweight and bulimic and binge-purge symptoms established in recent research [66][67][68].
Despite its extensive use, there is an emerging body of literature questioning the factor structure of the EAT-26, as the three-factor structure originally developed in an AN female sample does not perform similarly in non-clinical and non-SWAG (Skinny White Affluent Girls) stereotyped populations [69][70][71][72].Different factorial structures have been reported in non-clinical samples [71], different cultures and ethnic groups [66,70,[72][73][74], and different genders [75].Therefore, in the present study, we analyzed the factorial structure of the EAT-26 at the item and subscale level in order to evaluate how this measure performed in our mostly Hispanic and female sample.Internal reliability for the total score was α = 0.87.

Procedure
These data are part of a large cross-sectional study on weight-and health-related concerns in college students conducted at a large public, urban university in the southeastern United States.Upon signing up, participants received an anonymous Qualtrics survey link.Those who provided informed consent continued on to complete the survey.

Results
In line with recommendations from the methodological literature [63,76], we tested our incremental validity hypotheses about the associations of AS with disordered eating, above and beyond general anxiety, using a latent variable structural equation modeling (SEM) approach that separated true score variation in each construct from measurement error.We fit all SEM models using the lavaan package in R [77,78] and Mplus version 8 [79].

Approach to factor model estimation and handling of missing data
Before running our full latent variable regression model (depicted conceptually in Fig. 1), we ran a series of confirmatory factor analysis (CFA) models assessing the fit of each measurement model in our sample.When reviewing the original scale validation study for the ASI-3, we noted that Taylor et al. [80] conducted their CFA models using categorical factor analysis methods employing weighted least squares estimation procedures based on polychoric correlations-a method known in the quantitative literature for being appropriate to handle ordinal outcomes with five or fewer categories [81,82].Because the items of the BAI and EAT-26 are assessed using fourpoint ordinal response scales,2 we opted to apply ordinal factor analysis methods to these items as well.
Thus, following Taylor et al. [80] example, for our confirmatory and exploratory factor analyses, we used WLSMV (weighted least squares mean and variance adjusted) estimation which allowed us to treat the scaling of the categorical items appropriately while also obtaining the standard battery of SEM model fit indices [79,83].Because this approach to estimation requires complete data, we initially hoped to use categorical multiple imputation methods to fill in the missing values, allowing us to easily apply complete data WLSMV methods to each imputed dataset in a subsequent step.Unfortunately, when we attempted multiply impute all item-level data using categorical imputation methods in the Blimp software package [84], the imputation algorithm failed to reach convergence despite increasing the number of Bayesian MCMC iterations to extremely large values (in the hundreds of thousands and even the millions), likely due to the large number of ordinal items to be imputed.
Failing our first-choice multiple imputation strategy, we adopted a two-pronged approach to missing data handling.First, we estimated all of our primary models using WLSMV estimation on the N = 697 cases with complete data, deleting the 12.3% of cases with missing values.This approach allowed us to assess the model fit associated with all initial confirmatory factor analysis models.Once this was accomplished, we then proceeded to verify our final structural regression model results in a second step by rerunning the model with Bayesian missing data estimation procedures in Mplus, using the estimates from our final WLSMV model as starting values to aid model estimation and help ensure convergence.We chose a Bayesian approach to model estimation under missing data because it is known to be faster and more computationally tractable than frequentist estimation using FIML for categorical indicators (a procedure that requires computationally costly numerical integration methods in Mplus and tends to break down as the number of latent variables increases beyond 2 or 3) [79].The pairwise proportion of complete cases on each pair of variables obtained from the Bayesian analysis of our final model in Mplus ranged from 0.957 to 1.00.

Assessing the fit of the ASI and BAI and reevaluating the fit of the EAT-26
Fit statistics for all factor models are displayed in Table 1.The 3-factor structure of the ASI-3 [58] and the 2-factor structure of the BAI [64] exhibited generally acceptable fit [85]. 3By contrast, the original three-factor structure of the EAT-26 Garner et al. [59] showed unacceptable model fit across nearly all metrics.This was not surprising, given recent criticisms of the EAT-26 in the literature [86][87][88].Therefore, we conducted the EFA in Mplus, using WLSMV estimation to handle the categorical indicators in the same manner as our CFA.In this analysis, we extracted estimates and fit indices for 1-through 7-factor models.
To arrive at a final factor structure for the EAT-26 items, we used a combination of statistical and substantive criteria.Model fit was subpar for the 1-and 2-factor models so they were ruled out.Next, because a latent variable requires at least two indicators to be identified in a larger model featuring two or more latent variables [88][89][90][91], we only considered models in which at least two indicators exhibited high standardized factor loadings (≥ 0.7) on every factor. 4This criterion further ruled out the 5-, 6-and 7-factor models from consideration.To determine among the 3-and 4-factor models, we only considered factor loadings ≥ 0.3, and we dropped from consideration any indicator that did not load highly on any factor with a standardized loading ≥ 0.7.Finally, because we wanted to impose perfect simple structure in the measurement models in our final SEM [93,94], we dropped any indicator featuring a cross-loading ≥ 0.3.
The factor structure of the 3-and 4-factors models were largely overlapping.The difference was that the fourth factor extracted in the larger model included the two purging items from the EAT-26.Because these items were substantively meaningful indicators of ED risk, we opted to retain the 4-factor structure as our final model.Table 2 shows the standardized loadings of all items retained in our final model.All factors in this model, except for factor 3, "preoccupation with thinness, " feature either two or three indicators.On factor 3, the three highest loading indicators-items 1, 11, and 14-all clearly grouped around a common substantive meaning.Because the remaining two items (10 and 12) were not as closely aligned in their substantive meaning and because a latent factor in an SEM only requires 3 indicators to be identified (not 5), we opted to drop these items from our subsequent analyses.It is worth noting the correspondence between the factor structure we uncovered and those found in the previous literature.After dropping items 10 and 12 from the preoccupation factor, the structure of this factor was identical to the three-indicator 'self-perception of body shape' factor identified by Ocker et al. [86] and also mirrored the highest loading items from factor 1 in the supplemental materials of Maïno et al. [87].The other factors identified in our categorical EFA exhibited similarities with previous work as well: the three indicators in our "diet/carb restriction" factor are also featured in Ocker et al. [86] "dieting" factor and Maïno et al. [87] factor 4. Similarly, the items in our "pressure to eat" and "purging" factors were the same indicators that exhibited the highest loadings in Maïno et al. [87] factors 2 and 3, respectively.Although we conducted our categorical EFA analyses prior to discovering and reviewing this prior work 5 -such that the decision-making procedure described here was not influenced by the results of these previous studies-the similarity of our results to those of Ocker et al. [86] and Maïno et al. [87] is broadly encouraging.
Following our EFA analysis, we conducted a CFA of our four-factor solution to assess the fit of this model to our data.We emphasize that the purpose of this CFA was not to 'confirm' our exploratory model in the same (training) dataset 6 but was, rather, to establish that a CFA approach, Item wordings are reworded with electronic permission from the original scale by Garner et al. (1987).The remaining EAT-26 items not shown here were included in the EFA analysis, but ultimately excluded from the final factor structure based on the decision-making criteria described in the main manuscript.High standardized factor loadings (≥ .imposing perfect simple structure by allowing items to load on one and only one factor (thereby imposing zero loading constraints in the remaining entries of the factor loading matrix), would exhibit acceptable fit to our data.As seen in Table 1, the model fit was high in both the 4-factor EFA and the 4-factor CFA.Encouraged by these results, we proceeded to our SEM analyses.

Approach to latent variable regression model specification
Figure 2 displays our full latent variable regression 7 model. 8Note that we added the single EAT-26 item 4 assessing binging behaviors as a model outcome, based on the substantive importance of this type of ED behavior.Although utilizing a single item for this construct is not ideal, this approach allowed us to assess binging behaviors rather than omitting this construct from the model or attempting to force this binging item to hang together with other scale items that do not share the same meaning (that is, that do not ask about binging behavior directly).
In addition to this full model, we estimated two reduced models: (1) a model that only included the two BAI factors as regressors (x-variables); and (2) a model that only included the three ASI-3 factors as regressors (x-variables);.The rationale for including these reduced models was to afford easy calculation of the R-squared change ( R 2 ), and to facilitate comparison of whether and how results might shift when partialling out shared variance from the other constructs.To afford accurate calculation of R 2 between models, we estimated both reduced models using the extra DV approach described in Hayes [95].9

Latent variable regression results
Standardized results from our latent variable regression models are displayed in Table 3, fit using WLSMV estimation in lavaan.Squared semipartial correlations (sr 2 values) were calculated using the supplemental rsquareCalc()function from Hayes [95].Table 4 presents all pairwise model-implied correlations between our final model regressors and outcomes in the model.
As Table 3 shows, the AS subscales exhibit significant regression relationships with both the binging and purging outcomes, with or without controlling for general anxiety.Whereas higher levels of cognitive concerns were associated with higher latent propensities to binge, 10the reverse appeared to be true of social concerns, such that higher degrees of social concerns were associated with lower propensities to binge.Comparing the model R 2 from the full model to that of reduced model 1, the set of AS factors uniquely accounted for R 2 = 0.17 - 0.11 = 0.06, or 6% of the variance in binging propensity.
Furthermore, higher levels of cognitive concerns and lower levels of social concerns were significantly associated with higher purging propensities, controlling for somatic symptoms and subjective anxiety.The squared semipartial correlations associated with these relationships are even more pronounced than for the binging outcome (see Table 3): cognitive concerns uniquely accounted for 10.5% of the variance in latent binging propensities whereas social concerns uniquely accounted for 7.8% of the variance in latent binging propensities, controlling for each other, and for all other model regressors (x-variables);.Comparing the model R 2 for the purging outcome to that of reduced model 1, adding the AS factors results in R 2 = 0.22 -0.06 = 0.16, suggesting that AS accounts for 16% of the variance in latent binging propensity, controlling for the factors of general anxiety.
These results suggest that AS exerts significant associations with binging and purging outcomes, above and beyond general anxiety.Specifically, higher levels of cognitive concerns are positively associated with the propensities to binge and purge whereas higher levels of social concerns are negatively associated with these outcomes, possibly suggesting a protective or buffering influence. 7Note that, as stated, Fig. 2 depicts a path diagram of a latent variable regression model; not a causal diagram.As such, using standard path diagrammatic notation, the one-headed arrows in this diagram represent regression coefficients-no more, no less.Although we theorize that general anxiety and anxiety sensitivity can act as antecedents to disordered eating (but, as noted above, the past literature suggests that they might also, at times, act as consequents), we fully recognize the inability of cross-sectional data to speak to temporal precedence, let alone causality.Because the one-headed arrows here represent hypothesized associations, not ironclad causes, one peer reviewer thoughtfully suggested that we change all oneheaded arrows in the diagram to two-headed arrows.Though we appreciate the judicious and careful approach implied by this suggestion, we leave the diagram as-is, including the one-headed arrows in order to accurately depict the latent variable regressions as run in Mplus.Indeed, it is this regression-based specification that allowed us to test our incremental validity hypothesis by partialling out overlapping variance between the AS and BAI factors on the x-side of the model.Of course, the effect sizes of greatest interest in these analyses are the squared semipartial correlations and R-squared change values reported below, which can be interpreted as measures of (semi)partial association without recourse to causal language.Thus, ultimately, we fully trust our readers to understand the assumptions and caveats that come hand-in-hand with any regression analyses conducted on cross-sectional data, including latent variable regression analyses such as this one.
The AS subscales were not associated with the remaining eating outcomes in this sample-although, neither were the BAI subscales, except the subjective anxiety and panic subscale, which was associated with higher levels of latent preoccupation with thinness when controlling for all other regressors.
Table 5 presents the results of our final model, after reestimating it in Mplus using Bayesian estimation to fit the model and handle missing data.The pattern of results is comparable in direction, (relative) strength, and (Bayesian analogues to) 'significance.' These results only serve to strengthen our confidence in the robustness of our main model findings to different approaches to missing data handling.

Discussion
In the present study, we found that in a large sample of young adults, AS cognitive and social dimensions were associated with ED symptomatology, and most , between factor model indicators suggest that additional indicators may load on each factor model (but are omitted to conserve space).And once again, solid black vs solid grayscale lines are used to visually distinguish the regression models from the measurement models, respectively.One-headed arrows represent regression relationships.Bolded lines represent paths that reached significance in our final analyses (see Model 3 in Table 3) importantly, that these associations went beyond those of general anxiety.It is important to mention that most research to date has treated AS as a sole construct, without analyzing the differential contributions of the three AS dimensions.The present study expands our understanding of the unique and distinctive contributions of each AS dimension (beyond the influences of general anxiety) associated with EDs outcomes.We motivate future researchers to unravel these specific associations and further prove/establish AS risk and resilience effects in the development and maintenance of EDs.
Our results suggested that the cognitive dimension of AS behaved as a risk pathway for eating pathology, while the social dimension revealed a possible resilience or protective effect for EDs.(i.e., specifically for binging and purging outcomes).This suggests that individuals who exhibit heightened fears regarding their anxietyrelated thoughts, such as catastrophic interpretations of physical sensations, may be more prone to engaging in binge eating and purging.This positive association has important practice implications, as treatments should address the specific anxiety-related thoughts, and help reframe the catastrophic interpretations of physical sensations, to develop healthier coping mechanisms and reduce reliance on these maladaptive eating behaviors.On the other hand, individuals more concerned about their anxiety symptoms being publicly observable and more preoccupied about negative evaluations from others, may be at lower risk for engaging in binging and purging behaviors.Again, these findings are relevant for clinical practice and the development of new interventions that could target these increased concerns about social evaluations.Our results support previous findings looking at the associations between AS and binging, suggesting higher AS levels associated with greater calorie consumption [40], greater eating expectancies or feeling

Table 3 Standardized latent regression results of EAT-26 outcomes regressed on general anxiety and anxiety sensitivity
Bolded entries indicate significant results at or below the .05level.sr 2 = squared semipartial correlations, calculated using the supplemental rsquareCalc() function from Hayes [95].Reduced models were specified according to the extra DV approach described in Hayes [95].These models were estimated using WLSMV estimation in lavaan out of control [56,96], or binging behaviors [55].Literature on the associations among AS and purging is scarce.
On the other hand, the non-significant results across diet and carb restriction, pressure to eat and preoccupation with thinness could also be a result of the non-clinical sample selected.In fact, in a clinical sample, drive for thinness was significantly associated with AS [97].
Due to the high comorbidity among anxiety and eating pathologies, our results on the association of AS with ED beyond the highly comorbid generalized anxiety have clinical potential for differential and transdiagnostic prevention and intervention for EDs.By accounting for general anxiety we were able to focus specifically on the association of AS with EDs outcomes, proving a more targeted and unique understanding of these associations.This has clinical implications, allowing practitioners to better understand the complex interplay among factors involved in eating pathologies, and most importantly, to disentangle the high comorbidity among anxiety and EDs, to help develop more effective prevention and treatment interventions.
This study also adds to the emerging body of literature questioning the traditional factor structure of the EAT-26 in non-SWAG stereotyped samples [71,72,75].The uniqueness of our sample (i.e., mostly female and Hispanic), led to establish a new four-factor model of the EAT-26, similar to previous studies [98,99].Our findings reaffirm the need to embrace diversity in ED research, as proposed by Halbeisen et al. [69] and the need to critically assess widely used ED assessment tools (i.e., EAT-26) that may perform differently across diverse understudied samples.Further, the rising rates of EDs across these largely neglected populations-of different race/identity, gender, and sexual identity groups [100,101], older adults [102], and diverse socio-economic statuses [103,104]-stresses the need for greater diversity in future research of the etiology and symptomatic expression and to develop diversity-affirming and culturallysensitive assessment tools for EDs.
The current study has important limitations.First, it is based on a convenience sample recruited from the university population and composed of over 70% females, over 60% Hispanic, and a reported average EAT-26 total score below the clinical cutoff.This makes it difficult to generalize our findings to other genders, cultures, diverse demographic and educational backgrounds, or clinical populations.Future studies should consider including a broader spectrum of severity in EDs.Second, the cross-sectional nature of this study prevents us from establishing causal inferences between AS subscales and ED outcomes.Future research should examine through longitudinal designs how AS dimensions predict and impact in a temporal manner EDs risk or resilience.It is also important to note that the current dataset was collected in 2018, thus the reported levels and experience of anxiety and eating behaviors might have aggravated in the current time as a result of the health pandemic in 2020 [105].One final methodological limitation is our reliance on single item indicators for certain constructs in our model.Naturally, it would be more ideal to have multiple indicators for assessing binging and purging behaviors, as exemplified by our approach in estimating latent factors for the other subscales.Nonetheless, using the single binging item, for example, allowed us to assess binging behaviors rather than omitting this construct from the model or attempting to force this binging item to hang together with other scale items that do not share the same meaning (that is, that do not ask about binging behavior directly).That is, the decision to incorporate this single item was based upon both statistical considerations in terms of model fit and EFA results, as well as substantive concerns in terms of the meaning of the items in the EAT-26 questionnaire.From our standpoint, the available options were limited to either incorporating single item indicators as standalone outcomes, a choice substantively congruent with our rationale, or alternatively, omitting such items altogether, thereby missing any opportunity to assess the (semipartial) associations of anxiety sensitivity and general anxiety with these constructs within our model.In addition, previous studies have introduced new factorial structures for the EAT-26 including single item indicators [74,106].Ultimately, it is important to be aware that our reliance on single item indicators may have introduced measurement error and reduced the precision of our estimates in these parts of the model.
In addition to demonstrating the differential pathways of association of AS with disordered eating beyond generalized anxiety, our model provides therapeutic potential to reduce the risk of EDs.Emerging and young adulthood has been associated with elevated levels of stress and anxiety [107] that can impact AS and disordered eating.It has been argued that AS is a critical indicator and transdiagnostic treatment target for EDs [53,54].Thus, our model has important implications for practice, as it demonstrates associations between AS and ED pathology and suggests that both of these associated factors need to be considered when assessing risk.In fact, Fletcher et al. [108] argued that effective EDs interventions are dependent on addressing comorbid non-eating behaviors such as anxiety.In conclusion, our results suggest that individuals high in AS may rely on maladaptive eating (i.e., binging and purging) in an effort to regulate the experience of AS.Our differential results regarding the AS subscales underscore not only the complexity of eating pathologies, but also the importance of considering the unique fears and concerns associated with AS in the assessment and treatment of EDs.Anxiety sensitivity should be targeted in transdiagnostic treatment approaches to reduce risk and develop effective prevention and intervention strategies for EDs.

Fig.
Fig.1General, conceptual path diagram of the latent variable regression approach to incremental validity testing relating the anxiety sensitivity and general anxiety dimensions to eating disorder risk.Note: For ease of reading, the diagram omits exogenous variances and covariances and the endogenous disturbance.Ellipses, . . ., between factor model indicators suggest that additional indicators may load on each factor model (but are omitted to conserve space).Solid black vs solid grayscale lines are used to visually distinguish the regression model from the measurement models, respectively.Solid black one-headed arrows indicate regression paths

Fig. 2
Fig. 2 Path diagram of the final latent variable regression model.Note: For ease of reading, these diagrams omit: a exogenous variances and covariances as well, b item residuals (implied unique factors), c endogenous disturbances, and d disturbance variances and covariances.Once again, ellipses, . .., between factor model indicators suggest that additional indicators may load on each factor model (but are omitted to conserve space).And once again, solid black vs solid grayscale lines are used to visually distinguish the regression models from the measurement models, respectively.One-headed arrows represent regression relationships.Bolded lines represent paths that reached significance in our final analyses (see Model 3 in Table3)

Table 1
Model fit indicesAll models were fit using WLSMV estimation in lavaan, except for the EFA model in main table column 4, which was conducted using WLSMV estimation in Mplus.Fit statistics from lavaan are reported are from the robust column of output

Table 2
Standardized loadings from 4-factor EFA and CFA analyses of EAT-26 items 7) are presented in bold text thoroughly acquainted with the background literature on the EAT-26 measure at the time of the initial analyses.6However,in addition to fitting this CFA model to the dataset used in the present study, we also cross-validated the 4-factor structure of the EAT in three additional (validation) datasets collected by the same lab.The 4-factor version of the eat displayed in Table-2 resulted in good model fit in all three validation samples.See the Additional file 1 for further details.

Table 4
Model-implied regressor-outcome correlationsCorrelations were estimated using the what = "cor.all"argument in the lavInspect() function in lavaan, applied to the final latent variable regression model

Table 5
Standardized latent variable regression results using Bayesian estimation in Mplus*Indicates parameter estimates whose 95% posterior credible interval does not contain zero