Diabetes mellitus (DM) is a metabolic condition in where an increased blood sugar level over a prolonged period is observed. Diabetes can either be due to the inadequacy of insulin produced by the pancreas or due to improper response of the cell bodies to the insulin generated. The symptom of high blood sugar includes augmented hunger, increased thirst, and repeated urination. Diabetes may lead to several complications if left untreated. This paper deals with the latest accomplishments in non-invasive techniques for glucose and lifestyle observing which supports healthcare professionals in decision making. There are several procedures and techniques for analysis which can be put into two main categories—invasive procedures and non-invasive procedures. An invasive procedure is defined as a medical practice which pierces the skin in some manner whereas non-invasive procedure is any medical technique which does not pierce the skin. Non-invasive procedures are not always just good for making a diagnosis but sometimes they are used as treatment. © 2021, Springer Nature Singapore Pte Ltd.