The Food Forum of the National Academies of Sciences, Engineering, and Medicine convened a virtual workshop, Challenges and Opportunities for Precision and Personalized Nutrition, on August 10-12, 2021. The workshop explored potential challenges and opportunities in the application of precision and personalized nutrition approaches to optimize dietary guidance and improve nutritional status. Workshops presenters discussed current precision and personalized nutrition research methodologies, limitations in data and design, adapting technologies for utilization, and policy and regulatory challenges. This Proceedings of a Workshop summarizes the presentations and discussions of the workshop.