The first mention of a vegetarian diet in Poland appeared in the 19th century. Since then, its popularity has been growing steadily year by year. Nevertheless, it remains a controversial topic. Many scientists try to explain what is the correct vegetarian diet and how its use can affect the health and proper human body functioning. Vegetarian diet is mainly based on the elimination of meat consumption. Depending on the type, it also involves the abandonment of fish, eggs as well as milk and their products. Such kind of nutrition based mainly on plant-derived products can effectively prevent diseases of civilization, reduce the risk of developing obesity, promote the maintenance of normal cholesterol and blood sugar, and lower blood pressure. However, an incorrectly balanced vegetarian diet may be associated with deficiencies of some vitamins and minerals. This paper reviews a few dozens of studies on people using a vegetarian diet in Poland. This review shows that vegetarians in Poland are not very well studied group and further research is needed.