A method for performing an optical non-invasive blood glucose concentration change indication is disclosed, including: providing an optical energy source spaced from a photo-detector by a sensing area transmitting energy from the optical energy source across human tissue disposed in the sensing area and onto the photo-detector storing a first reading corresponding to a light intensity observed by the photo-detector and displaying the first reading on a display of a user device, the first reading corresponding to a baseline blood glucose concentration. Apparatus for performing the method and additional embodiments are disclosed.
