Diabetes mellitus is a complex heterogenous metabolic disorder prevalence of which is increasing day by day.  International Diabetes Federation (IDF) predicts that the number of people with diabetes will rise from 366m in 2011 to 552m in 2030. The developing countries will be affected most by escalating diabetes epidemic primarily due to urbanization, changing food habits and less physical activities.  Of the total diabetic population about 90% are type 2 diabetics, rest are type 1 diabetics.

It is well established that in diabetes multiple abnormalities can be detected in diverse tissues. Therefore, it is very difficult to get a single group of effective compound(s) to treat this complicated disease. There are several types of glucose-lowering drugs including insulin sensitizers, insulin secretagogues, GLP-1 analogs and α-glucosidase and DPP-IV inhibitors etc. Most of them, however, have considerable side effects and are expensive. Hence, it is crucial to search for new drugs that would potentially have no or less side effects and will be moreaffordable. Medicinal plant drug discovery provides important leads against various pharmacological targets. As more than 80% of population of the developing countries depend on plant materials for their primary health care, it is imperative to scientifically evaluate the folkloric information on plant materials used for diabetes.