Change in eating disorder symptomatology across the menstrual cycle may have important implications for treatment. This interpretation is supported by genetic data that indicate a moderately strong heritability of binge eating 55,56 and vomiting as a compensatory behavior . Moreover, it has been suggested that exacerbation of binge eating is more consistently present across all women with BN the week preceding menses compared with exacerbation during the mid-luteal phase, during which time only some women show exacerbation in binge eating . Studies comparing binge-eating frequency in women with BN across menstrual cycle phases show that both binge-eating frequency and bulimic symptoms are significantly elevated in the luteal (premenstrual) phase compared with the follicular and ovulatory phases 32,50–52. Additionally, the loss of white blood cells can lead to the increased risk and severity of infections. This can lead to the person’s heart rate and blood pressure dropping, which increases the risk of heart failure. In addition, reducing the calories the body consumes can lead to the breakdown of muscles and other tissues within the body, including the heart. Early intervention and treatment greatly improve the likelihood of recovery. Psychotherapy is a common course of treatment for bulimia that may help address issues of self-esteem. Therefore, someone with bulimia may need additional screening and treatment for different mental health conditions. In boys, genetic effects on overall levels of eating pathology symptoms are 0% in pre-adrenarche, 44% in late adrenarche, and 57% in early gonadarche and into young adulthood.18,28 In girls, genetic effects on eating pathology are 0% in pre-gonadarche and ~50% in mid-gonadarche and beyond.26,27,29–31 These developmental patterns indirectly suggest that at least some of the underlying genetic mechanisms (e.g., timing of activation of protective/risk genes) likely differ for males versus females. Adolescent and adult studies generally point to sex similarities in the magnitude of genetic effects on eating pathology symptoms (e.g., binge eating, weight/shape concerns, composite scores), with heritability estimates typically ~40–70% in both sexes.19–25 However, sex differences have been found for the timing of the developmental emergence of genetic contributions to eating pathology symptoms, as well as the types of genetic factors contributing to heritability estimates within each sex. Given consistent presentation of muscular-oriented body image concerns and related behaviors, this lack of conceptual framework is concerning.57 Further, evidence suggests that males report less severe overall ED psychopathology compared with females.17 However, it is likely that much of the gold standard assessments reveal lower scores among boys given a lack of validity and sensitivity within specific items.15 Given a limited number of studies specific to boys, low sample size in samples of men in mixed-sex trials and assessment methods that retain bias and cull symptoms more specific to females (eg, internalization of a thin ideal),32,57 developing and testing assessment tools specifically among males is unequivocally essential to future assessment, diagnostic, and treatment endeavors. Over several decades, evidence has accumulated in support of an association between sexual orientation and ED symptoms in adults, particularly in men,43–47 and in adolescent males.48–50 In examination of trends over time in eating pathology among adolescent sexual minority subgroups, although notably improved compared with sexual minority females, males continue to report higher prevalence of purging, using diet pills, and fasting to lose weight compared with their heterosexual counterparts.50 It seems that increased prevalence exists across a variety of ED symptoms; in a recent cohort study in the United Kingdom, at age 14 years, homosexual and bisexual boys reported significantly greater body dissatisfaction than their same-sex heterosexual peers.49 At this age, sexual minority boys also reported greater dysfunctional eating behaviors compared with their heterosexual peers. Notably, women with AN often exhibit estradiol concentrations similar to those observed in menopausal women, suggesting that this decrease in estradiol may hinder the effectiveness of SSRI treatments. Compared with other psychiatric disorders, the knowledge about beneficial pharmacological treatments for eating disorders is minimal. Third, exogenous administration of reproductive hormones may have important implications for eating disorder treatment and the chronicity often observed in these disorders. In order to fully characterize the role of reproductive hormones in eating disorder vulnerability and maintenance, researchers examining animal populations and researchers examining human populations will need to work closely together. Furthermore, limited work suggests that eating disorder symptoms affect the normal functioning of the estrogen system such that increased consumption of binge-type fatty meals decreases the inhibitory effect of estradiol. Previous animal research has shown that females in the womb with males are exposed to higher levels of testosterone. Testosterone appears to protect people against eating disorders, providing further evidence that biological factors – and not just social influences – are linked to anorexia and bulimia, according to new research findings at Michigan State University. Some existing literature indicates that non-white boys, and in particular those of Latino and African American identification, demonstrate higher rates of disordered weight control behaviors compared with white or Asian boys.48,59–61 However, other work found that weight control behavior and concerns were equally or more prevalent among all non-whites, including higher risk among Asian American boys.58 Overall, there are largely mixed findings in the relationship between ED symptoms and cultural and ethnicity-related factors. Importantly, hormone augmentation alone is not an adequate treatment for an eating disorder, so this should be applied only in conjunction with additional forms of treatment, such as cognitive–behavioral therapy – which is often the treatment of choice for eating disorders, specifically BN and BED. It is also suggested that aspects of puberty and eating disorder symptoms share genetic vulnerability factors. Comparing the genetic influences on eating disorder symptomatology in girls pre- and post-puberty indicates that the genetic effects for eating disorder symptomatology in prepubertal girls were near 0% but rose markedly to approximately 60% in postpubertal girls and young adults 74,75. However, to date, studies have not examined the separate phases of pregnancy to determine in which phase risk and remission typically occurs, or whether it is the hormone concentration or flux in estradiol and progesterone that may serve as the critical window for risk or remission. It appears that the impact of pregnancy on eating disorder symptoms varies across women, representing a window of remission, relapse and new onset for BED.