Case Specific Nutrition | 431 followers on LinkedIn. Individualized Nutrition. Incredible Results. Match with your dietitian: https://www.casespecificnutrition.com/match | Case Specific Nutrition (CSN) is a group of passionate, Registered Dietitians (RDs) who help people achieve their health and wellness goals using person-centered nutrition guidance and motivational coaching techniques. CSN The Private Practice: Founded in 2013, CSN is Pittsburgh based and proudly supports the community through their four office locations in the Greater Pittsburgh Area. CSN is in-network with all major insurers.