Psychological factors in functional hypothalamic amenorrhea: A systematic review and meta-analysis

Background: Psychological factors have been found to be associated with functional hypothalamic amenorrhea (FHA); however, their role in the onset or persistence of FHA is still understudied. The study aims to assess the associations of psychological factors with the presence vs the absence of FHA.

Methods: A systematic literature search has been conducted across the major databases (PubMed, PsycINFO, Scopus, and Embase) to explore the psychological factors associated with FHA. The search was limited to English-written articles published from 2000 onwards. Articles were selected based on stringent inclusion/exclusion criteria. After data extraction, meta-analysis and meta-synthesis were conducted.

Results: Of 349 retrieved articles, eight studies were included. Findings indicate that the main psychological factors associated to FHA seem to be depression and eating attitudes, especially drive for thinness. FHA women present higher levels of anxiety, sleep disorders, dysfunctional attitudes, and alexithymia. The meta-analysis on drive for thinness revealed that the pooled MD across the studies was statistically significant both in the fixed 0.63 (95% CI: 0.31–0.95) and random model 0.70 (95% CI: 0.13–1.26). Likewise, as for depression, the pooled MD across the studies was statistically significant both in the fixed 0.60 (95% CI: 0.36–0.84) and random model 0.61 (95% CI: 0.20–1.01).

Discussion: Findings showed the association of psychological factors and FHA and recognized their involvement in the persistence of the disorder. A multidisciplinary approach should involve a collaborative process between gynecologists, clinical psychologists, and psychiatrists, from diagnosis to treatment. Longitudinal studies should be implemented with a comparison/control group or by including clinical psychologists in the psychological assessment and study design.

1 Introduction

Functional hypothalamic amenorrhea (FHA) is a form of secondary amenorrhea caused by hypogonadotropic hypogonadism related to an aberration of the pulsatile release of gonadotropin-releasing hormone (GnRH) from the hypothalamus (1). FHA entails a significant impact on ovarian function with hypoestrogenism and the sequent absence of a regular menstrual period persisting for more than 3-6 months in women who previously had regular cycles (2, 3).

According to epidemiological data, in Europe and USA FHA accounts for 20-35% of cases of secondary amenorrhea, rising to be one of the most common reproductive disorders in women of childbearing age (4). Among adolescent girls, the prevalence of FHA is approximately 15-48% of secondary amenorrhea diagnoses (5), but that may be underestimated due to the difficulty in differentiating from the instability of hypothalamic–pituitary-ovarian (HPO) axis during puberty (6). However, once the menstrual pattern is assumed, the approach for the diagnosis of amenorrhea does not differ from that of adults (1, 6).

FHA has been found to be related to the suppression of the HPO axis; these dysregulations of the HPO axis in FHA seemed not to be caused by any identifiable organic disease or anatomic factor (1), while they were found to be associated with stress, weight loss, and/or excessive physical exercise (7). Based on these eliciting factors, three variants of FHA have been established: weight loss-related, exercise-related, and stress-related (3). As the cause of FHA does not seem organic but functional, the role of psychological factors can be decisive in assessing their impact on the onset and persistence of the disorder. In fact, a psychogenic component has been recognized in FHA since its first diagnostic formulation (8).

Considering weight loss-related FHA, evidence shows that psychological factors interact with significant physiological changes, metabolic alterations, and endocrinological aberrations, contributing to the persistence of FHA (9, 10). Indeed, women with FHA reported more deranged eating attitudes, restrictive eating behavior, and bulimic symptoms than comparison (11). As previous studies have shown, women with dysfunctional eating attitudes are at higher risk for menstrual problems and infertility (12). As it is widely known, decreased food intake causes a shortage of energy, which leads the body to economize and thus suspend those functions not necessary for survival (such as menstruation) (13). All these features are also present more severely in patients with an eating disorder, so it is essential to make an appropriate differential diagnosis.

Likewise, exercise-related amenorrhea is a frequent clinical condition among athletes, particularly those involved in elite sports and aesthetic disciplines (1), such as artistic skating and gymnastics. Several psychological and behavioral factors have been identified as contributing to the high prevalence of secondary amenorrhea in athletes. One of the main factors is high energy expenditure associated with many athletic activities, which can lead to energy deficits and disrupt regular ovulatory cycles. In addition, many athletes engage in disordered eating practices such as restricting food intake or engaging in extreme dieting to maintain leanness for optimal performance (1). Another potential factor is psychological stress associated with athletic training and overstated goals.

Concerning stress-related FHA (3), the Endocrine Society Clinical Practice Guidelines (14) claim that various types of stress and life events, which are perceived as traumatic and/or stressful experiences by women, might trigger the disease. In this sense, it has been argued that FHA is a type of somatic disorder caused by stress (15–17). Russell and colleagues (18) identified a wide spectrum of stressors that may characterize the prior experience of women with FHA, such as extreme danger, fear for one’s own safety profound family conflict or loss, and minor life changes (starting school, etc.). So far, a fair number of literature reviews has been published investigating the pathophysiological factors of FHA or its consequences also in term of psychological effects (7, 19, 20), However, to the best of our knowledge, no review has been specifically designed to address psychological factors in FHA, nor their role on the onset, persistence, or subtype of FHA. The primary aim of this systematic review was to assess the associations of psychological factors with the presence (cases) vs the absence (controls) of FHA. The recognition of the involvement of such factors may help the identification of new clinical strategies for the management of FHA.

2 Materials and methods

The systematic review was conducted according to the Cochrane Collaboration guidelines (21) and the PRISMA Statement (22), to provide a comprehensive and unbiased overview of the evidence defining psychological factors associated with FHA, its onset or persistence.

2.1 Search strategy

To include the broadest range of literature, the electronic literature search was conducted on the four major databases in the field of health sciences: PubMed, PsycINFO, Scopus, and Embase.

The search was limited to articles published from 2000 onwards (in order to focus on more contemporary psychological constructs and assessments) and to English-language journal articles. The literature search was undertaken on the 24th of February 2022 and was adapted for each database as necessary. The search strategy includes Medical Subject Headings (MeSH) and text words for the following domains of interest: 1) secondary amenorrhea/secondary amenorrhoea/functional hypothalamic amenorrhea; AND 2) psychology/psychological/mental health, OR 3) stress/stressor/distress, OR 4) emotions/emotional/affective/alexithymia. The selection of the search term was based on the literature on FHA and the clinical experience. Lateral searching of Google Scholar and of the reference lists of included studies was executed manually. An expert librarian was consulted to verify that the search strategy was adequate to yield a comprehensive literature search. Figure 1 shows the process of literature search and selection of publications.

FIGURE 1

Figure 1 Flow diagram of literature search and process of studies’ selection.

2.2 Eligibility criteria

The inclusion criteria were as follows:

● diagnosis of FHA based on current criteria (1);

● peer reviewed studies;

● studies adopting an analytical study design (i.e., an observational study with a control or comparison group);

● studies addressing psychological dimensions using standardized and validated instruments.

Exclusion criteria were:

● intervention studies;

● non-empirical studies (e.g., case reports, commentaries, reviews, abstract meeting, or letters);

● studies not addressing psychological dimensions;

● not available full text.

2.3 Study selection and data extraction

Study selection was performed independently by two researchers (FB, LB), through the screening of records (i.e., titles, abstracts, and keywords). If the abstract was insufficient to determine the eligibility of the article, screening was based on the full text. When the two researchers did not reach a consensus on inclusion, decisions were made through discussion with a third researcher (GP).

A standardized data form was prepared in Excel to simplify data management. The following information was extracted for each eligible article: title, authors, country of the first author, keywords, article type.

2.4 Quality assessment

The “Quality appraisal checklist – quantitative studies reporting correlations and associations” by the National Institute for Health and Clinical Excellence (NICE) (23) was used to assess quality of studies. Two reviewers (FB, LB) independently applied criteria to assess a study’s internal and external validity and address the following key aspects of study design: characteristics of study participants; definition of independent variables; outcomes assessed, and methods of analyses. Checklist items are worded so the following responses are possible: “++” =2; “+” = 1; “-” = 0., “Not Reported (NR)” = 0. Since Items 3.4 and 3.5 are not applicable to any of the included studies, they were not considered in the total count. For each article, the sum of all scores was calculated; the highest possible score was 34. The threshold for high quality was set at 75% (minimum score=25.5) of the total score. Disagreements were resolved through discussion with a third researcher (GP).

The quality assessment did not eliminate any studies, rather it provided a comprehensive view of the quality of the studies’ methodology, analysis, and presentation of results (Supplementary Table A).

2.5 Meta-synthesis and meta-analysis

First, a meta-synthesis was undertaken to synthesize evidence and provide a comprehensive overview of the data. Thus, two reviewers (FB, LB) independently identified psychological dimensions based on psychological constructs (e.g., depression, anxiety, etc.) describing the findings that emerged from the included studies. Data were clustered and summarized to describe the identified dimensions.

The primary analysis was calculated using descriptive statistics reported in the results section of each study and involved differences in the distributions of psychological factors between FHA women and controls (or comparison). Since all studies compare mean values and standard deviations (SDs) across case/control groups on continuous outcome variables, effect sizes (expresses as mean difference) and the corresponding 95% confidence interval (CI) were performed using Cohen’s d (24) or Hedge’s g (25) and its 95% confidence interval (26) for each outcome measure. Specifically, Cohen’s d was calculated when two groups have similar standard deviations and are of the same size; while Hedges’ g was computed when there are different sample sizes. Cohen’s d or Hedge’s g values were interpreted as small if 0.2≤ d (or g) < 0.5, medium if 0.5 ≤ d (or g) < 0.8; large if d (or g) ≥ 0.8 (27).

Then, because the included studies were heterogeneous in terms of variables and instruments, it was not always appropriate to undertake a meta-analysis (21). A decision was made to only conduct a meta-analysis if four or more studies assessed the same psychological construct, as already made in previous studies (28).

Meta-analysis was performed using the Comprehensive Meta-Analysis Software program (26).

Statistical heterogeneity was assessed with the I², which has been conventionally adopted to indicate low, moderate, and high heterogeneity values of 25%, 50% and 75%, respectively (29). As heterogeneity among studies was expected on the basis of large variability in the assessment of psychological constructs across different studies, both fixed and random-effects models were used (30).

To investigate potential publication bias, the funnel plot of the results of the included studies was checked for asymmetry (31).

3 Results

3.1 Study characteristics

Of the 349 publications found, 347 were identified by database search and 2 by an additional search based on the articles’ bibliography. The process of removing duplicates and screening titles and abstracts resulted in 8 publications. Therefore, we included 8 studies in the review (Table 1), of which two (36, 37) refers to the same study population (and were therefore included but jointly analyzed). All studies used a case-control design (women with FHA vs healthy controls), with 3 studies also included a comparison group (organic amenorrhea or due to anorexia nervosa -AN-), for a total of 514 women: 209 with FHA, 239 eumenorrheic controls, and 66 with other forms for amenorrhea.

TABLE 1

Table 1 Characteristics of the studies included in the review.

3.2 Psychological factors

The psychological variables detected by the selected studies are described in Table 2.

TABLE 2

Table 2 Psychological assessment.

The psychological aspects assessed are numerous, including both symptomatologic dimensions as depression, anxiety, stress, sleep disorders, or eating disorders, and more stable or trait dimensions as alexithymia, self-control, perfectionism, need for social approval, or resilience. Sexual functioning is included in one study.

3.3 Depression

Five studies (11, 32–34, 38) evaluated the role of depression in FHA using self- report instruments.

We observed heterogeneity in the populations involved and in the questionnaires adopted in each study. Three studies involved adult women (32, 33, 38) and assessed depression through the Beck Depression Inventory (32, 38) or the Zung Self-Rating Depression Scale (33); while two studies involved FHA adolescents assessing depression through the Children Depression Inventory (11, 34).

Considering depression, a significant difference in level of depression between FHA patients and controls was found both in adult (32, 33) and adolescent (34) populations (respectively: d = 0.77 [0.21 − 1.33]; d = 0.83[0.37 − 1.29]; d = 1.25 [0.59 − 1.90]). In contrast to these results, the study by Pentz and colleagues (38) did not find a significant difference between FHA women and healthy controls, neither on the scale of depression (BDI) nor with the scale of mood disorders (Profile of Mood States).

The pooled MD across the studies was statistically significant both in the fixed 0.60 (95% CI: 0.36–0.84) and random model 0.61 (95% CI: 0.20–1.01); the heterogeneity between the studies included was moderate (I² 63%) (Figure 2).

FIGURE 2

Figure 2 Forest plot of depression prevalence in FHA patients and controls.

The funnel plot (Supplementary Figure A) showed a low risk for publication bias.

Considering the comparison between FHA patients and women with other amenorrhoeic conditions, a non-significant difference was found between FHA patients and patients with organic amenorrhea (32) while a significant difference was found between FHA patients and AN patients (d = -0.99[-1.63 − -0.35]) (34), with FHA adolescents reporting less depressive symptoms when compared to adolescents with AN.

3.4 Eating disorders

Seven studies (11, 32, 34–38) evaluated the role of eating attitudes and eating disorders in FHA using self- report instruments. Specifically, four studies used the Eating Disorder Inventory-2 (EDI-2) (11, 32, 34, 38) finding differences between FHA patients and controls or comparison groups with respect to the EDI-2 subscales (see Table 2 for all data). In particular, the subscale drive for thinness, which assesses excessive concern with dieting, preoccupation with weight, and fear of weight gain, was found to be significantly higher in FHA patients when compared to controls or organic amenorrhoeic patients, with large effect sizes (32, 34, 38), and significantly lower when compared to patients with AN, with moderate effect sizes (34).

The meta-analysis on the subscale drive for thinness (Figure 3) revealed that the pooled MD across the studies was statistically significant both in the fixed 0.63 (95% CI: 0.31–0.95) and random model 0.70 (95% CI: 0.13–1.26); the heterogeneity between the studies included was moderate (I2 65%). The funnel plot (Supplementary Figure B) showed a low risk for publication bias.

FIGURE 3

Figure 3 Forest plot of drive for thinness subscale prevalence in FHA patients and controls.

Moreover, two studies (35–37) used the Eating Attitude Test-26, with contrary findings: while Tranoulis and colleagues (36, 37) found a significant difference in EAT-26 scores between FHA patients and controls (g= 1.36 [0.95-1.77]), and specifically higher dieting [g= 0.90 (0.51-1.29)], bulimia and food preoccupation [g= 1.72 (1.29-2.15)], the study by Pentz & Rados (35) did not found difference in disordered eating behaviors between FHA and controls; however, FHA patients reported more prevalent history of anorexia nervosa (20% vs 0% and 0%, respectively).

3.5 Other psychological symptomatologic dimensions: anxiety, stress, sleep disorders, psychiatric disorders

Two studies assessed anxiety, both in term of level of state (current) and trait (lifetime) (33, 36, 37), using two different measurement scales (Zung Self-rating Anxiety Scale and State-Trait Anxiety Scale respectively). Moreover, the study of Strock and colleagues (38) explore anxiety symptoms through a subscale of the Profile of Mood States.

A significant difference in level of anxiety between FHA patients and controls was found (33, 36, 37) (respectively: d = 1.26 [0.79 − 1.75]; g = 1.10 [0.70 − 1.50]). Higher prevalence was shown among FHA patients.

The study by Strock and colleagues (38) assessed the role of stress through two self-reported questionnaires, without showing significant difference between FHA patients and controls.

One study (36) explored the presence of sleep disorders finding significant differences between FHA patients and controls regarding sleep problems (see Table 2).

Two studies explored psychopathological dimensions by clinical interviews, one using a psychodynamic semistructured interview (11) and one using the Structured Clinical Interview for DSM-IV Disorders (SCID) (35), with miscellaneous results (see Table 2 for all details). Briefly, Bomba and colleagues (11) showed that FHA patients reported: i) an absence of important depressive and anxious disorders in FHA patients, similarly to control subjects; ii) a presence of mild subclinical depressive traits in FHA patients; iii) a presence of subclinical eating disorders in adolescence; iv) presence of previous stressful events reported by their parents and presence of common life events associated with the onset of FHA.

Also, the study by Pentz & Rados (35) revealed that the prevalence of depressive or anxiety disorders did not differ between FHA and control or comparison groups, while FHA patients reported more prevalent history of anorexia nervosa (20% vs 0% and 0%, respectively).

3.6 Psychological trait dimensions: alexithymia, dysfunctional attitudes, parental rearing perception

The study by Bomba and colleagues (34) assessed alexithymia and found a significant difference between FHA adolescents and healthy controls in relation to alexithymia and one of its subscale reflecting difficulties in describing feelings [respectively d= 1.27 (0.61-1.93) and d = 1.38 (0.71-2-05)]. FHA adolescents reported higher levels of alexithymia.

Three studies assessed other dysfunctional attitudes as self-control, perfectionism, and need for social approval (32, 35, 38), finding that FHA women reported higher dysfunctional attitudes [d= 0.83 (0.27-1.40)] (32) and, specifically: a significant effects on a greater need for approval (32, 38) [respectively, d=0.85 (0.29-1.41) and d= 2.7 (2.00 – 3.39)], higher levels of perfectionism trait [d= 1.39 (1.06-1.72)] and higher levels of concerns over mistake [d= 1.08 (0.85-1.31)] compared to controls (35). No difference was found regarding self-control neither compared to control (32, 38, 43) nor to comparison (32, 35) groups.

Two studies assessed the parental rearing perception, one with a questionnaire (35) and one through a clinical interview (11) with contrasting findings. While the study by Pentz & Rados (35) showed that the FHA group did not differ from controls in perception of parental rejection, emotional warmth or overprotection, the study by Bomba and colleagues (11) found that 80% of FHA girls reported having an excessively demanding, controlling, and intrusive mother, with conflicting family relationships in 50% of cases.

3.7 Sexual functioning

The study by Dundon and colleagues (33) also explore the sexual functioning of FHA patients, showing a significant difference on sexuality between FHA patients and controls [d = 1.22 (0.74-1.69)], but not on satisfaction with partner. Specifically, FHA women reported lower scores on sexuality scale that includes sexual desire, sexual arousal, orgasm, and satisfaction or enjoyment of sexual activities when compared to controls

4 Discussion

FHA is a form of secondary amenorrhea with a complex etiology, in which numerous factors have been implicated as specific triggers for its onset. In this review, we present an overview of the psychological factors associated with FHA.

All reviewed studies found that psychological factors played a role in FHA condition. Despite the heterogeneity of studies and populations, we identified some recursive psychological factors that might be clinically relevant. It is possible to divide findings in two main categories: those exploring psychological state, which might be transitory, like depression, eating attitudes, anxiety, and sleep disturbances; those focusing on psychological traits, which may represent benchmark index of patients functioning, like alexithymia, stress, and life events.

As for the symptomatologic dimensions, studies found numerous significant results on psychological state of FHA patients, identifying depression and eating attitudes as the most common psychological disturbances in FHA patients. A significant level of mood symptoms and depressive scores was showed among FHA women and adolescents (11, 34). Women with FHA experienced significantly higher depression than healthy women (33). However, two studies (11, 35) assessing psychopathological dimensions by clinical interviews, showed that FHA patients do not manifest important depressive disorders, with scores similar to those of control subjects. According to these findings, patients with FHA may often manifest depressive symptoms; however, they do not satisfy criteria for a clinical diagnosis for depressive disorder (11, 35).

Eating attitudes and behaviors were investigated, finding difference between FHA patients and controls/comparison groups. These findings are in line with previous studies (13, 67) showing that several dysfunctional attitudes towards nutrition, such as a focus on diet, extreme physical activity, and fear of gaining weight, characterize the psychological profile of FHA patients. Dysfunctional eating attitudes and subthresholding restrictive anorexia nervosa seem to be associated with FHA (11). Although patients with FHA do not meet the psychopathological criteria for a diagnosis of AN, they reported a higher prevalence of previous diagnosis of anorexia nervosa (35).

Overall, it is noteworthy that the symptoms that emerged via self-report were not confirmed by the interviews performed (11, 35). Further studies are needed to assess psychological variables with instruments other than the self-report measures, which work well as screening measures but have no diagnostic purpose.

Furthermore, reviewed studies have investigated other psychopathological symptomatology. Studies by Dundon and colleagues (33) and Tranoulis and colleagues (37) found a significant difference in anxiety levels between FHA patients and controls, while the study by Strock et al. (38) did not identify any significant findings. One study (36) explored the presence of sleep disturbances, finding significant differences with a higher prevalence among FHA patients.

One of the most popular hypotheses on the etiology of amenorrhea is that stress is one of the important pathogenetic factors in FHA patients. Although this hypothesis has been confirmed over time (6, 15–17), surprisingly only one study has investigated the role of stress in the diagnosis of FHA, revealing no significant findings. This finding is in contrast with previous literature. For example, Berga and colleagues (68) in a case-control study found that the group consisting of women with FHA had a higher concentration of cortisol than eumenorrheic women due to stress. According to the authors, high cortisol levels characterize the clinical condition of patients with FHA and, considering the recognized association between cortisol and stress, they count stress among the factors involved in the onset of FHA (68). Specifically, a key endocrinological aspect of stress is hyperactivation of the hypothalamic-pituitary-adrenal axis (6). Stress increases the secretion of corticotropin-releasing hormone and consequently contributes to the elevated levels of adrenocorticotropin and cortisol secretion, which reduce GnRH drive (7). However, it is difficult to find a clear definition of what ‘stress’ means in relation to FHA. Lazarus and Folkman (69) claim that stress originates from those situations in which the individual perceives his/her own resources to be insufficient to cope with the situation. To date, the definition and the nature of the stress underpinning FHA are still an intriguing matter of debate. Thus, further studies should define stress related to FHA and clarify its role.

Concerning psychological traits, reviewed studies explored alexithymia, dysfunctional attitudes, and parental rearing perception, which can represent benchmark index of patients functioning. An interesting study (34), compared alexithymia levels between FHA adolescents and control, showing that FHA patients have more difficulties in describing feelings. Alexithymia refers to the difficulties that individuals gave in perceiving, differentiating, and expressing emotions. This condition often characterizes the psychological profile of patients with somatic disorders (70) and it could be also a characteristic of women with FHA. In the reviewed studies FHA women reported higher dysfunctional attitudes such as higher level of perfectionism, higher concerns over mistakes, and greater need for approval than controls (32, 35). This is in line with previous literature (13, 14, 68), which have defined the psychological profile of women with menstrual problems, identifying low self-esteem, introversion, fear of judgement, high expectations of themselves in addition to those identified by this review.

As for parental rearing perception, studies found contrasting results (11, 35). However, in one of two studies 80% of FHA girls reported an excessive, demanding, controlling and intrusive mother, with conflict family in 50% of cases. Furthermore, stressful life events, such as presence of psychiatric disease in family, post-partum depression, intrafamiliar conflicts, transfers, and chronic disease are often reported in patients with FHA and felt very stressful, having an impact on the FHA condition (18).

Still concerning relational variables, Dundon and colleagues (33) investigated satisfaction with partner relationships and sexuality. No differences emerged in partner satisfaction, but a study (33) showed a significant difference in sexuality between FHA patients and controls. FHA women reported lower scores on the sexuality scale including sexual desire, sexual arousal, orgasm, and satisfaction or pleasure with sexual activities than controls. Although sexuality appears to be a central aspect of the psychological functioning of women with FHA, only one study has explored it (33).

Findings showed the association of psychological factors with the diagnosis of FHA and recognized their involvement in the persistence of the disorder. A multidisciplinary approach is fundamental in the clinical management of FHA and should involve a collaborative process between gynecologists, clinical psychologists, and psychiatrists, from diagnosis to treatment. The condition of FHA requires attention because it may reflect psychological or psychiatric difficulties and/or have a serious impact on daily life and quality of life. The primary intervention for women with amenorrhea is often solely focused on physiological aspects, but evidence has shown the positive impact of psychological interventions in terms of disease outcomes. Berga and colleagues (71) showed that a cognitive behavioral intervention designed to minimize problematic attitudes was likely to result in resumption of ovarian activity than observation. Based on the literature and results of this review, it is noteworthy that a tailored behavioral psychological intervention offers an effective treatment option that complements the clinical approach aimed at the recovery of ovarian activity.

The review presents some limitations. The review is based on only 8 studies; the small number of studies testifies to the fact that there is still a paucity of data regarding the psychological factors associated with FHA. Likewise, the number of patients composing the samples involved in the included studies is small. The heterogeneity of the studies’ designs and instruments allowed the meta-analysis to be carried out on a limited number of variables. Moreover, different instruments have been used to measuring the same construct. Since no study presented a prospective design from the time of diagnosis onwards, it was not possible to identify causal relationships between psychological factors and FHA and draw clear conclusions on the role of psychological factors in FHA.

Based on these considerations, further studies, possibly including epidemiological studies with prospective designs, are needed to clarify the temporal patterns and causal relationships between psychological factors and FHA. Likewise, additional studies on FHA are warranted to explore the role of psychological factors other than eating attitudes and depression. Specifically, the nature and the role of the stress underpinning FHA should be explored.

Author contributions

FB, GP, DL, EV, and LB were involved in the study conceptualization and methodology development. FB and GP performed the search. LB and FB conducted data analysis. FB, GP, and LB were involved in writing the original draft of the manuscript. EV and DL reviewed and edited the manuscript. All authors contributed to the article and approved the submitted version.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fendo.2023.981491/full#supplementary-material

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