Functional Diagnostic Nutrition (FDN) is a system of health coaching that uses functional lab testing to identify and address the root causes of chronic health conditions. Developed by Reed Davis in 2008, it incorporates principles from functional medicine, nutrition, and holistic health to create a personalized health program for each client. The FDN practitioner uses lab testing to assess the client's hormone levels, immune function, digestive health, and other biomarkers. Based on the results, they develop a customized plan that includes dietary and lifestyle changes, nutritional supplementation, and other natural therapies. The goal is to support the body's natural healing processes and restore optimal health and vitality.

Nutrigenomic testing is a field of study that examines the relationship between an individual's genetics and their response to nutrition. It involves analyzing genetic variations to understand how they affect the body's response to nutrients, metabolism, and the risk of diet-related diseases. This type of testing aims to provide personalized nutrition advice based on an individual's genetic makeup to optimize health and prevent disease.