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Functional Diagnostic Nutrition: Using Saliva Testing, Food Sensitivity Labs, and Lifestyle to Find Root Causes: Reed Davis, Board Certified Holistic Health Practitioner (HHP) and Certified Nutritional Therapist (CNT), is founder of Functional Diagnostic Nutrition (FDN). He discusses using functional testing alongside conventional care to uncover “dysfunction” when standard labs appear normal. Davis describes assessing adrenal and metabolic stress via saliva testing for circadian cortisol patterns, cortisol-DHEA balance, sex hormones, secretory IgA, and melatonin, emphasizing clinical correlation and individualized “studies of one.” He outlines an approach targeting multiple “healing opportunities” (H-I-D-D-E-N: hormones, immune, digestion, detoxification, energy, nervous system) and applying D-R-E-S-S (diet, rest, exercise, stress reduction, supplementation) rather than relying on supplements alone. A case example links chronic hives, medication-related weight gain, and food triggers identified through additional testing, including the Mediator Release Test. The discussion also covers stress-driven gut dysbiosis, digestion decline, and EFT tapping for stress-related symptoms, and notes FDN practitioners can be found via FDNtraining.com/medicine.

Dr. Hoffman continues his conversation with Reed Davis, Board Certified Holistic Health Practitioner (HHP), Certified Nutritional Therapist (CNT), and founder of Functional Diagnostic Nutrition (FDN).

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Registered dietitian nutritionist Leyla Muedin discusses a Nature Communications study of 108,723 French adults in the NutriNet-Santé cohort (2009–2023) examining long-term exposure to food preservatives and type 2 diabetes. Using detailed dietary records cross-referenced with product/additive databases, researchers identified 58 preservative-related additives and analyzed 17 consumed by at least 10% of participants; 1,131 diabetes cases occurred. Higher overall preservative intake was associated with a 47% increased diabetes risk (49% for non-antioxidant preservatives; 40% for antioxidant additives), with several specific additives linked to higher risk. Leyla questions whether the findings reflect preservatives themselves or the ultra-processed, refined-carbohydrate foods that contain them, emphasizing recommendations to favor fresh, minimally processed foods and limit refined carbs and processed foods.