Maven Precision Nutrition is a Black-owned metabolic testing and custom nutrition practice in Allied Gardens at 4420 Rainier Avenue, Suite 310, San Diego 92120, founded in 2021 by DeRahn Johnson. The practice's core service is resting metabolic rate testing — a 10-minute indirect calorimetry breathing analysis that measures precisely how many calories a client's body burns at rest, replacing generic calorie calculators with individualized metabolic data. Johnson holds a Fitness Nutrition Specialist certification from the National Academy of Sports Medicine and a Nutrition Specialist credential from the American Association of Sports Dietitians & Nutritionists, backed by over 10,000 hours of in-field consulting across fitness and wellness organizations. Gym members building strength and body-composition targets at Vertica Fitness San Diego in Allied Gardens layer Maven's metabolic data into their training macros, using RMR results to calibrate protein, carbohydrate, and fat ratios for specific training phases. Prior to founding Maven, Johnson spent 13 years as a software engineer — a background he applies to the data-analysis methodology behind each client's custom meal plan. The practice has collaborated with Jazzercise, Orangetheory Fitness, Boy Scouts of America, Rancho La Puerta, and the San Diego Public Library system on nutrition education programming. Maven operates by appointment from the Rainier Avenue suite in Allied Gardens, near the Waring Road commercial corridor and the I-8 interchange. The practice maintains BBB accreditation with an A+ rating under The Maven Method LLC, the company's registered legal entity since its 2021 incorporation. Clients addressing metabolic health alongside musculoskeletal care coordinate nutrition plans with providers at Chiropractic Center for Health and Human Potential in Allied Gardens, where dietary inflammation markers inform chiropractic treatment protocols. Maven's LGBTQ+-affirming and transgender-safe practice model accepts clients of all backgrounds through its appointment-based scheduling system.