Dr. Jay Luthar, MD, DipABLM, and Dr. Julia Loewenthal, MD have been named 2026 Castle Connolly Top Doctors, marking the second consecutive year they have received this prestigious designation. Only 7 percent of the nation's licensed physicians are selected annually as Castle Connolly Top Doctors for their specialties in their regions. The recognition underscores the unique approach of Lutanen Health, a bespoke primary care and longevity practice in Boston's Back Bay, where each physician cares for no more than 150 patients, emphasizing deep, sustained relationships and strategic health stewardship.
Unlike traditional volume-driven practices, Lutanen Health integrates longevity science into everyday care, identifying risks before symptoms emerge and implementing interventions to preserve vigor and delay decline. The practice is academically affiliated and the only one in Boston to weave longevity science into routine primary care. Dr. Luthar commented, 'The Castle Connolly recognition affirms what I believe matters most in medicine: time, trust, and partnership. When you understand someone's biology, context, and goals over time, you can offer care that is not only more effective but deeply human.'
Both Dr. Luthar and Dr. Loewenthal are fellowship trained in integrative medicine, bringing mind-body science and holistic approaches to lifestyle optimization. Their 3,000-square-foot healing space in Back Bay includes a state-of-the-art human performance laboratory. Lutanen Health focuses on metabolic health, cardiovascular risk reduction, cognitive preservation, and healthy aging, utilizing advanced diagnostic technologies such as AI-guided plaque detection, multi-cancer early detection blood testing, VO₂ max testing, biological age tracking, and genetic analysis.
Dr. Luthar completed his medical residency at Cambridge Hospital, a Harvard Internal Medicine Residency Site, and is board-certified in Internal Medicine, Integrative Medicine, and Lifestyle Medicine. Dr. Loewenthal completed her internal medicine residency at Brigham and Women's Hospital and a geriatric medicine fellowship through the Harvard Multi-Campus Geriatrics Program, and is board-certified in Internal Medicine and Geriatric Medicine. Both hold academic faculty roles at Harvard Medical School, bridging clinical care, education, and research to advance healthy aging.
The Top Doctors selection process involves nominations by peer physicians and review by the physician-led Castle Connolly research team, based on criteria including medical education, training, hospital appointments, and disciplinary histories. Doctors cannot pay to be selected. For more information about Castle Connolly Top Doctors, visit castleconnolly.com.
