Polycystic ovary syndrome is a modern disease that affects 1 out of 5 women of reproductive age worldwide. The disease is accompanied by dysmenorrhea, hyperandrogenism, overweight, skin problems, etc. To date, it has been precisely established that polycystic ovary syndrome is a polygenic hormonal problem correlated with genetically determined determinants. There are exogenous factors that induce the development of pathology, which can be regulated and controlled. One of the exogenous factors that can have a serious impact on women's health and control of polycystic ovary syndrome is a balanced diet and elimination of deficiencies in the body, especially vitamin D and folic acid deficiency. The improvement of numerous health indicators through lifestyle modification, which includes nutrition and exercise, is among the suggested management techniques in the evidence-based international clinical guidelines. This systematic review seeks to offer a general idea regarding the state of know-how in this topic by summarising the actual findings from randomised controlled trials, systematic reviews, and meta-analyses.