Abstract: The present invention relates to a system (100), a device, a method (200), and a computer program for providing a health advice to a subject. It is proposed to modify a digital coaching advice depending on trends of a physiological observable (e.g., weight, Body Mass Index, etc.). A digital coach varies the wording of his/her advice depending on the risk categorization. It is proposed to analyze physiological measurements for deviation from the mean and rate of change and to translate these basic statistics into a concept of urgency/risk to structurally vary the wording or appearance of a digital coach. Thus, a digital coach as proposed herein may look, act and talk differently depending on the urgency/risk of the users. Coaches may vary in language and appearance from gentle, via hard-but-fair, to “drill sergeant”.