Mangieri is a food and nutrition expert and is a board certified specialist in sports dietetics. She owns Nutrition CheckUp, a nutrition consulting practice located in Pittsburgh, Pennsylvania that specializes in sports nutrition, weight management and disordered eating. In her practice, she provides nutritional guidance and expertise to casual exercisers and competitive athletes so they can maximize their training efforts to reach their fitness goals. She also coaches clients interested in weight management and wellness to improve their life with nutrition and physical activity in order to feel better and prevent disease. Mangieri joined the Carnegie Mellon University team in 2015 as a consultant to the Student Health Services and the Athletic Department.
For the past six years, Mangieri has served as a spokesperson for the Academy of Nutrition and Dietetics, helping translate science into practical messages that can be understood by the public. She frequently writes on sports nutrition and weight management topics and speaks to consumers and professionals on eating right when it matters most. Mangieri is the author of Fueling Young Athletes, due to be released in December 2016.