That’s not a typo (“E” instead of “A”) in the title. ESPEN is the European Society for Clinical Nutrition and Metabolism. If you are a dietitian practicing in Canada or the US, you are probably more familiar with resources from A.S.P.E.N., the American Society for Parenteral and Enteral Nutrition.
Access to these ESPEN resources is free and does not require membership. I quickly scanned some guidelines relevant to my area of practice and the resources seem to be high quality and useful so I’m adding them to my toolkit in the sidebar.