Rachael Costello is a registered dietitian nutritionist in private practice based in Northern Illinois. She works with family feeding issues, including picky eaters and developing healthy eating habits and weight loss programs. She provides nutrition counseling for clients dealing with food allergies and intolerance.  

Rachael is also a clinical supervisor and adjunct faculty in the Nutrition Program at Harper College.

Educational Background

Rachael holds an M.S. in Applied Nutrition from the University of New England and a B.A. in Dietetics from the University of Northern Colorado.  She completed her dietetic internship at  Virginia Commonwealth University Medical College of Virginia.  She has a certificate of training in food allergy from the Academy of Nutrition and Dietetics.

Professional Associations

  • Academy of Nutrition and Dietetics
    • Medical Nutrition Practice Group
    • Dietitians in Integrative and Functional Medicine
  • Illinois Academy of Nutrition and Dietetics


Rachael Costello, MS, RDN, LDN, is a registered dietitian. The materials and content contained on this site (www.RachaelCostelloNutrition.com) are for general educational purposes only and are not intended to be a substitute for professional medical advice, diagnosis or treatment. Persons with serious medical conditions should consult a physician before beginning or modifying any diet, exercise or lifestyle program. The use of any information provided on this site is solely at your own risk.