Protein shakes are often high in calories particularly if you have added sugars or flavoured proteins to it. However, both pure whey protein is relatively low in calories as compared to the calories found in ready-made protein shakes or powders which even when blended with milk and other additives may contain more than expected in terms of calories consumed. https://theusapeople.com/do-protein-shakes-lead-to-unwanted-weight-gain.html