Introduction: Allostatic load refers to the cumulative burden of chronic stress and life events. It involves the interaction of different physiological systems at varying degrees of activity. When environmental challenges exceed the individual ability to cope, then allostatic overload ensues. Allostatic load is identified by the use of biomarkers and clinical criteria. Objective: To summarize the current knowledge on allostatic load and overload and its clinical implications based on a systematic review of the literature. Methods: PubMed, PsycINFO, Web of Science, and the Cochrane Library were searched from inception to December 2019. A manual search of the literature was also performed, and reference lists of the retrieved articles were examined.We considered only studies in which allostatic load or overload were adequately described and assessed in either clinical or non-clinical adult populations. Results: A total of 267 original investigations were included. They encompassed general population studies, as well as clinical studies on consequences of allostatic load/overload on both physical and mental health across a variety of settings. Conclusions: The findings indicate that allostatic load and overload are associated with poorer health outcomes. Assessment of allostatic load provides support to the understanding of psychosocial determinants of health and lifestyle medicine. An integrated approach that includes both biological markers and clinimetric criteria is recommended.

Background: Serotonin-noradrenaline reuptake inhibitors (SNRI) are widely used in medical practice. Their discontinuation has been associated with a wide range of symptoms. The aim of this paper is to identify the occurrence, frequency, and features of withdrawal symptoms after SNRI discontinuation. Methods: PRISMA guidelines were followed to conduct a systematic review. Electronic databases included PubMed, the Cochrane Library, Web of Science, and MEDLINE from the inception of each database to June 2017. Titles, abstracts, and topics were searched using a combination of the following terms: “duloxetine” OR “venlafaxine” OR “desvenlafaxine” OR “milnacipran” OR “levomilnacipran” OR “SNRI” OR “second generation antidepressant” OR “serotonin norepinephrine reuptake inhibitor” AND “discontinuation” OR “withdrawal” OR “rebound.” Only published trials in the English language were included. Results: Sixty-one reports met the criteria for inclusion. There were 22 double-blind randomized controlled trials, 6 studies where patients were treated in an open fashion and then randomized to a double-blind controlled phase, 8 open trials, 1 prospective naturalistic study, 1 retrospective study, and 23 case reports. Withdrawal symptoms occurred after discontinuation of any type of SNRI. The prevalence of withdrawal symptoms varied across reports and appeared to be higher with venlafaxine. Symptoms typically ensued within a few days from discontinuation and lasted a few weeks, also with gradual tapering. Late onset and/or a longer persistence of disturbances occurred as well. Conclusions: Clinicians need to add SNRI to the list of drugs potentially inducing withdrawal symptoms upon discontinuation, together with other types of psychotropic drugs. The results of this study challenge the use of SNRI as first-line treatment for mood and anxiety disorders.

There is growing awareness of the role of allostatic load (the cost of chronic exposure to fluctuating or heightened physiologic responses resulting from repeated or chronic stress) in the balance between health and disease. When environmental challenges exceed the individual ability to cope, allostatic overload ensues. The determination of allostatic load initially relied on measurements of biomarkers, and then it was expanded to clinimetric criteria for allostatic overload. It provides a characterization of the individual psychosocial environment that is missing from current clinical diagnostic formulations and has major implications for identifying syndromes that are not included in traditional diagnostic classifications. Healthy lifestyle behavior and euthymia may modulate the vulnerabilities induced by allostatic overload. Here, we present a staging system for the longitudinal development of allostatic load. Consideration of allostatic load allows clinicians to create individually tailored interventions to prevent or decrease the negative impact of environmental factors on health.

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The building of life stress, well expressed by the concept of allostatic load, plays an important part in all phases of endocrine illness. Allostatic load refers to the cumulative burden of both stressful life events and chronic stress. When environmental challenges exceed the individual ability to cope, allostatic overload ensues. Assessment of allostatic load/overload by clinical measurements including indices and rating scales, in addition to biomarkers, offers a characterization of the person’s psychosocial environment that is missing from current formulations. Consideration of allostatic load in endocrinology may shed light on a number of clinical issues: interpretation of abnormal hormone values that lack explanations; coping with the various phases of illness; maladaptive illness behavior; response to treatment; presence of residual symptoms; health-damaging lifestyle habits. Addressing allostatic load calls for innovative models of endocrine outpatients with multidisciplinary organization of care, extended time for the interview, focus on rehabilitation. We provide an overview on the mechanisms of allostatic load, how it can be assessed, its potential role in endocrine disturbances, and how its consideration may lead to a needed innovation in patient care.