This thesis will show the importance and influence of regular exercise and balanced diet on the treatment and regulation of blood sugar levels in people suffering from diabetes. It will outline the ways in which proper nutrition and physical activity impact health as well as how they prevent and slow down different medical complications. The study aims to explain how physical activity and sport affect diabetes and blood glucose control. We will also give a few examples of accomplished athletes with diabetes,who manage to reconcile their career in sport with their condition. The goal of this research is to show how certain nutrients impact the course of a disease as well as to explain in what ways carbohydrates ,fats and proteins can cause an array of metabolic disorders. The study will also go on to show how vitamins and minerals influence our health. Furthermore,we will delve into why seeking expert advice is essential for people with diabetes in order to have an active and healthy life. In the preparation of this final thesis I consulted several scientific papers and research articles which are all indexed in various biomedical databases like Hrčak and Pub Med. In addition,other scientific books and publications in the field of nutritionism, biomedicine, medicine and sport were used. A small portion of the data was collected from online sources.