Diabetes is one of the most prevalent chronic diseases worldwide and is one of the fastest growing global health problems of the 21st century. Since diabetes is a multisystemic disease requiring complex treatment, regular analysis of the condition of patients with diabetes is necessary. As wearable medical systems for monitoring human health develop, there is huge potential for testing and thus improving diabetes care. The purpose of this work is to evaluate the current developments in wearable biosensors for glucose analysis. In particular, the possibilities of sweat testing for non-invasive blood glucose testing will be considered. Wearable biosensors, as a convenient means of measurement, have become a rapidly growing area of interest due to their ability to integrate traditional medical diagnostics and the use of miniature "laboratory on the body" analytical devices. The availability of human condition testing is of great importance. Diabetes is best treated by tight glycemic control, which is achieved by monitoring glucose levels. Recently, various principles of biosensor analysis for diabetes biomarkers have been developed based on new principles of analysis, which are discussed in this review.