In relation to human health and functioning, light, or more specifically optical radiation, plays many roles, beyond allowing vision. These may be summarized as: regulation of circadian rhythms; consequences of direct exposure to the skin; and more indirect effects on well-being and functioning, also related to lifestyle and contact with natural and urban environments. Impact on mental health is relevant for any of these specifications and supports a clinical use of this knowledge for the treatment of psychiatric conditions, such as depression or anxiety, somatic symptom disorder, and others, with reference to light therapy in particular. The scope of this narrative review is to provide a summary of recent findings and evidence on the regulating functions of light on human beings’ biology, with a specific focus on mental health, its prevention and care.

Background: Since the outbreak of the COVID-19 pandemic, healthcare workers (HCWs) have been faced with specific stressors endangering their physical and mental health and their functioning. This study aimed to assess the short-term psychological health of a sample of Italian HCWs and the related influencing factors. In particular, the study focused on the differences related to HCWs’ gender and to having been directly in charge of COVID-19 patients or not. Methods: An online survey was administered to the whole staff of the Modena General University Hospital three months after the onset of the pandemic, in 2020. Demographic data and changes in working and living conditions related to COVID-19 were collected; mental health status was assessed by the Depression, Anxiety and Stress Scale (DASS-21) and the Impact of Event Scale-Revised (IES-R). Results: 1172 out of 4788 members returned the survey (response rate = 24.5%), the male/female ratio was 30/70%. Clinically significant symptoms assessed according to the DASS-21 emerged among 21.0% of the respondents for depression, 22.5% for anxiety and 27.0% for stress. Symptoms suggestive of a traumatic reaction were reported by 19.0% of the sample. Symptoms of psychological distress were statistically associated with female gender, job role, ward, changes in lifestyle, whereas first-line work with COVID-19 patients was statistically associated with more stress symptoms. HCWs reported a significant level of psychological distress that could reach severe clinical significance and impact dramatically their quality of life and functioning. Conclusions: Considering the persistence of the international emergency, effective strategies to anticipate, recognize and address distress in HCWs are essential, also because they may impact the organization and effectiveness of healthcare systems.

Evidence about bone health in people affected by psychiatric disorders is limited. This narrative review aims to highlight what is known, up to the present time, about clinical connections between bone health and psychiatric disorders, particularly depressive disorders (DD) and bipolar disorders (BD), in terms of common biological pathways. Besides inflammation, we focused on two molecules of growing interest: neuropeptide Y (NPY) and the neuro-hormone melatonin. Also, the role of psychoactive drugs on bone tissue was explored. For the preparation of this narrative review, the scientific literature of the most recent 7 years from PubMed, Springer Nature, Science Direct (Elsevier), Wiley Online, ResearchGate, and Google Scholar databases was analyzed. Reviewed evidence reveals that people diagnosed with BD or DD have an increased risk of both fractures and osteoporosis; NPY reduces bone loss induced by longer periods of depression and “buffers” psychological stress effects on bone health. MLT shows beneficial effects in osteoporosis and bone healing. Lithium, a mood stabilizer, shows potential bone-protective activity, while antipsychotic and antidepressant treatments may increase the risk of bone tissue damage, though further investigation is needed.