Introduction and purpose of the work: Non-alcoholic fatty liver disease (NAFLD) is a common condition in the general population. In its course, excessive fatty acids are deposited in liver cells. The best way to prevent it is to reduce weight by being physically active and eating a proper low-calorie diet. The purpose of this study is to describe the potential health benefits of the mediterranean diet in people with NAFLD. For this purpose, the literature available in the PubMed database was reviewed using the following keywords: mediterranean diet; non-alcoholic fatty liver disease (NAFLD); non-alcoholic steatohepatitis (MASH). State of the knowledge: The mediterranean diet is rich in fruits, vegetables, nuts, fish, olive oil and whole-grain products. It has the effect of decreasing insulin resistance, which is a major cause of NAFLD. In addition, it exerts anti-inflammatory and antioxidant properties. In recent years, numerous clinical studies have been conducted analyzing the effects of this diet on laboratory results, liver steatosis and progression to steatohepatitis (MASH) in patients with NAFLD. Conclusions: The results of the studies show that following a mediterranean diet can prevent as well as alleviate the course of this disease. However, there is a need for more clinical studies, on larger groups of people to recognize the mediterranean diet as an effective form of NAFLD therapy.

The prevalence of vitamin D deficiency in society and the growing awareness of related health problems have resulted in the widespread use of vitamin D supplementation. The source of vitamin D is skin synthesis with the participation of ultraviolet radiation (UVB) and its supply with the diet. The inability to cover the daily requirement for vitamin D without an additional source of vitamin D means that the society most often reaches for dietary supplements that do not have the properties of a medicinal product. The use of over-the-counter supplements, where the actual dose of the vitamin may differ from the dose declared by the manufacturers, may result in a lack of benefit from the food product when the vitamin D content is too low or lead to hypervitaminosis when the content is too high.

Adaptogens are synthetic compounds or plant extracts that have the ability to increase the body's efficiency in the presence of stress stimuli. Extracts from ginseng, Eleutherococcus senticosus, Rhaponticum carthamoides, roseroot and chinensis are the best known plant adaptogens. The aim of this work is to assess the use of plant adaptogens in the past and present, and to outline the prospects for their future use. The use of natural adaptogens by humans has a rich history - they are used to treat many diseases, improve memory or reduce the effects of stress. Half a century ago, plant adaptogens were first used in competitive sports due to their effect on increasing the body's resistance to stress and improving physical endurance. Although many people now take plant adaptogens, human clinical trials are still very limited. Information obtained while writing this paper indicates that plant adaptogens may provide a number of benefits in the treatment of chronic fatigue, cognitive dysfunction and immune diseases.

Introduction and Purpose. Polycystic ovary syndrome (PCOS) is the most common endocrinopathy in women of reproductive age worldwide. Patients may present with a wide range of symptoms. According to the most commonly used Rotterdam criteria, the presence of 2 out of 3 criteria is required for diagnosis: clinical and/or biochemical markers of hyperandrogenism (HA); ovulation disorders (oligo- or anovulation); polycystic ovaries on ultrasound (PCOM); and exclusion of disorders mimicking the clinical features of PCOS. The basis of treatment are birth control pills, metformin and antiandrogens. The pathogenesis of the syndrome is not fully understood. The aim of the study is to summarize the potential health benefits of vitamin D supplementation for women with PCOS based on publications from the last 10 years available on Pubmed. State of knowledge. Vitamin D receptors have been identified not only in calcium-regulating tissues, but also in many reproductive organs, such as the ovary (especially granulosa cells), uterus, placenta, testes, as well as hypothalamus and pituitary gland. In recent years, there have been studies analyzing the effect of vitamin D supplementation on the hormonal balance, metabolism and clinical symptoms in women with PCOS. Summary. The results of studies on vitamin D supplementation in women with PCOS are mixed. Some of them are promising and confirm a beneficial effect on glucose metabolism and insulin resistance, lipid metabolism, hormonal balance, alleviation of HA-related symptoms, improvement of menstrual frequency; while the results of other studies do not show significant improvement and do not confirm these effects. Therefore, there is a need for further research on the relationship between the pathogenesis of PCOS and vitamin D and the impact of its supplementation.

Introduction and purpose of work: COVID-19 is a disease caused by the SARS-CoV-2 virus. Vitamin D is categorized as a steroid hormone that affects the body's calcium-phosphate balance. It also exerts an immunomodulatory and anti-inflammatory function. Numerous studies indicate that vitamin D levels may have an impact on the course of COVID-19 infection. The purpose of this study is to describe the potential health benefits of vitamin D supplementation in COVID-19 patients. The literature available in the PubMed database was reviewed using the following keywords: "vitamin D"; "COVID-19 infection"; "SARS-Cov-2 virus". Stan wiedzy: Witamina D zmniejsza ryzyko ciężkiej ostrej infekcji górnych dróg oddechowych i COVID-19 poprzez jej wpływ na zmniejszenie replikacji wirusa, zmniejszenie produkcji cytokin prozapalnych i zwiększenie integralności komórek śródbłonka w drogach oddechowych. Stymuluje również syntezę katelicydyny i beta-defensyn. Białka, o których mowa, wykazują bezpośrednią aktywność przeciwwirusową. Część badań dowodzi, że niedobór witaminy D zwiększa śmiertelność, potrzebę inwazyjnej i nieinwazyjnej wentylacji u pacjentów z SARS-Cov-2-dodatnim. Udowodniono, że odpowiednia suplementacja omawianej witaminy zmniejsza ryzyko zakażenia COVID-19 nawet u osób wrażliwych. Wnioski: Wykazano, że obniżony poziom witaminy D zwiększa częstość występowania i nasilenie infekcji COVID-19. Istnieje potrzeba dalszych badań w celu potwierdzenia suplementacji witaminy jako skutecznej metody zapobiegania i łagodzenia infekcji wirusem SARS-Cov-2.