Heather Mangieri, MS, RDN, CSSD, LDN, is an award-winning food and nutrition expert, registered dietitian, and board-certified specialist in sport dietetics. She is the founder of Nutrition CheckUp, a nutrition consulting practice with expertise in sport nutrition, weight management, and disordered eating. She consults with a variety of clients, including casual exercisers, competitive athletes, and families looking to eat well while navigating busy schedules. She specializes in helping active adolescents eat well for proper growth, development, and sport performance.

Since 2010 Mangieri has been a national media spokesperson for the Academy of Nutrition and Dietetics. She has built a reputation for delivering evidence-based messages in sport nutrition, adolescent sport nutrition, weight management, ergogenic aids, dietary supplements, fad diets, and lifestyle modification. Mangieri frequently writes about sport nutrition, including in the professional publications of the National Collegiate Athletic Association and the Academy of Nutrition and Dietetics, as well as in Stack magazine and Food and Nutrition magazine. She has been quoted in hundreds of national publications, including Fitness, ESPNW, ESPN Kids, Runner's World, Women's Running, Women's Health, Men's Fitness, Men's Health, New York Times, Chicago Tribune, Los Angeles Times, and USA Today. In addition to national recognition, she has a strong local following, appearing frequently on KDKA Pittsburgh's show Night Talk.

Mangieri speaks regularly to athletes, consumers, and professionals about sport nutrition, dietary supplements, weight management, and disordered eating. In June 2014 she spoke on disordered eating in athletes at the first Eating Disorders in Sport conference and spoke on the same topic at the 2015 annual meeting of the Collegiate & Professional Sports Dietitians Association.

In 2008 Mangieri was recognized as Pennsylvania's Young Dietitian of the Year. In 2012 she received the Keystone award in recognition of her leadership in demonstrating outstanding professional standards to serve and advance the aim of Pennsylvania dietitians. She serves on the executive committee of Sports, Cardiovascular, and Wellness Nutrition (SCAN), a dietary practice group of the Academy of Nutrition and Dietetics.

Mangieri studied human nutrition with an emphasis on research at Pennsylvania State University, earning a BS degree in 1996. She earned her master's degree from the University of Pittsburgh in wellness and human performance in 2007. Before entering private practice, she was an instructor at the University of Pittsburgh in the department of sports medicine and nutrition and a part-time faculty member in the department of exercise science at Chatham University, teaching nutrition and exercise classes to undergraduate students.

She lives in the Pittsburgh metropolitan area.