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Nowadays, the gluten-free diet (GFD) has become much more than the dietary treatment for celiac disease. Due to its presumed beneficial effects even in non-celiac subjects, it has become a new fashion statement and it is promoted by some healthcare professionals, social media and marketing strategists. On the other hand, regardless of a proper medical indication, a GFD may present side effects, such as poor palatability, high costs and socio-psychological adversities. Moreover, it can be an obstacle to correct clinical practice and may induce nutritional deficiency due to a low-quality diet. In addition, a GFD can trigger or exacerbate many irritable bowel syndrome (IBS)-like disorders in predisposed subjects: reactivity to dietary nickel, the increased consumption of FODMAP-rich foods and histamine intolerance seem to frequently play a relevant role. The possible intersections between high-risk foods in these categories of patients, as well as the possible overlaps among IBS-like disorders during GFD, are described. In conclusion, it is advisable to undergo a careful clinical evaluation by a gastroenterologist and a nutritionist (in some cases, also a psychotherapist) before starting and during a GFD, because both benefits and risks are possible. It is also important to take into account IBS-like disorders that can be exacerbated by a GFD and that are still underestimated today. [ABSTRACT FROM AUTHOR]

Simple Summary: The treatment of advanced non-small cell lung cancer (NSCLC) after the age of 65 raises age-related problems as the elderly are often affected by other diseases, not infrequently chronic, take drugs that may interfere with anti-cancer treatment and are sometimes unable to fully understand relevant information. Moreover, they do not represent the ideal patient for enrolment in clinical trials, even with immunotherapy, which is now the choice therapy for the first-line treatment of NSCLC. With a view to offering more time to patients with metastatic NSCLC, the issues of quality of life and appropriateness of oncological care in the elderly are of primary importance. This review stresses the need to find a common approach to lung cancer management in a steadily aging society and describes the main currently available data on the use of immune checkpoint inhibitors in older patients with advanced NSCLC, confirming the necessity for reliable biomarkers that predict immune response to assess which patients benefit from which type of immunotherapy. Immune checkpoint inhibitors have changed the history of NSCLC treatment by becoming, alone or in combination with platinum-based chemotherapy, a mainstay of first-line therapy for advanced NSCLC. This increasingly dictates the identification of predictive biomarkers of response that can guide patient selection, in order to rationalize and personalize therapies, particularly in elderly patients. Immunotherapy in these patients raises questions of efficacy and tolerability related to aging, which is accompanied by a progressive decline in various body functions. Physical, biological and psychological changes contribute to individual validity status and, preferably, 'fit' patients are generally enrolled in clinical trials. In elderly patients, especially frail and complex patients with more than one chronic disease, data are poor and specific prospective studies are needed. This review reports the main available results on the use of immune checkpoint inhibitors in older patients with advanced NSCLC, in terms of efficacy and toxicity, and aims to highlight the need to better predict which patients might benefit from immunotherapy agents by probing knowledge and integrating information on immune system changes and age-related physiopathological modifications. [ABSTRACT FROM AUTHOR]