Modern Manna Health was started in 1978 by Danny Vierra, CNC. In 1978 Danny purchased his first health food in Tracy, California, and two years later, he bought his second health food store in Lodi, California. As Danny helped many customers with their health issues, he learned which natural methods worked best. His clients also shared many healing stories about their success and reversal of many illnesses.

Danny hosted a live radio show called Healthline for 15 years. Every Tuesday morning, he shared the latest health topic and interviewed alternative doctors, natural healers, or health educators on a specific health subject. Through Danny's research in natural medicine, he acquired knowledge on various health subjects and a greater ability to answer live questions from callers.

Danny particularly enjoyed his radio guest Charlotte Gerson, the daughter of the late Dr. Max Gerson. Dr. Gerson was the genius who developed the world famous Gerson Therapy. Danny had the privilege of visiting the Gerson Hospital and learning by Charlotte’s side on several occasions.

Danny promoted Modern Manna’s Health and Healing Crusades in Lodi, California which began in 1993. Some of the alternative doctors that have been featured at the event are the following: Dr. T. Colin Campbell, Dr. John McDougall, Dr. Neal Barnard, Dr. Richard Schulze, Charlotte Gerson, Dr. Lorraine Day, and Howard Lyman—the Mad Cowboy.

Danny was the Director of BellaVita Lifestyle Center and RISEN School of Natural Hygiene in California, He supervised hundreds of cleansing clinics and lifestyle programs. Danny trained students in the practical application of natural remedies such as cold-sheet treatments, herbal remedies, aromatherapy, charcoal poultices, castor oil packs, massage, hydrotherapy colon cleansing, lifestyle medicine, and God’s Laws of Health. Danny's approach to health was to assisting the body's natural ability to heal.