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Our Providers

Meet Our Experienced Medical Team

DR. SAGAR VERMA

Internal Medicine, Obesity Medicine & Integrative Medicine Physician

Dr. Sagar Verma is the founder and owner of Lifestyle Physicians, with locations in Warrenton and Culpeper, where he leads a physician-led practice focused on obesity, wellness, and integrative medicine. In addition to operating the Lifestyle Physicians Holistic Wellness Center, he is dedicated to helping patients achieve long-term health through personalized and preventive care. Dr. Verma is board-certified in Internal Medicine and Obesity Medicine by the American Board of Obesity Medicine, and also holds board certification in Integrative Medicine through the Academy of Integrative Health and Medicine (AIHM). Before relocating to the United States, he practiced as a Radiation Oncologist in India.

Since 2009, Dr. Verma has worked as an Internal Medicine Hospitalist. His passion for preventive care and wellness led him to establish Lifestyle Physicians in 2015, where he continues to serve the community with a focus on holistic health. He is also certified in Bioidentical Hormone Replacement Therapy (BHRT) and trained under Dr. Neal Rouzier, a globally recognized expert in hormone therapy.

In addition, Dr. Verma is trained and certified in regenerative medicine by Dr. Charles Runnels of the Cellular Medicine Association of America. He is an active member of several professional organizations, including the Obesity Medicine Association, AIHM, the American Medical Association, and the Virginia Medical Society.

Meet Our Fairfax Aesthetic Expert

Katherine Castro

Master Esthetician

Katherine Castro is a licensed Master Esthetician at Lifestyle Physicians, specializing in advanced medical aesthetics and corrective skincare treatments. She combines a strong clinical foundation with a personalized, results-driven approach to skin health. Working within a physician-led practice, Katherine ensures that every treatment is safe, effective, and tailored to each patient’s unique needs.

Her expertise includes advanced aesthetic services such as facials, chemical peels, microneedling, laser treatments, and customized skincare routines. She focuses on long-term skin health, creating individualized treatment plans that address concerns like acne, pigmentation, aging, and overall skin texture.

Known for her patient-focused approach, Katherine takes the time to understand each individual’s goals before recommending treatments. Her goal is to help patients achieve smoother, healthier, and more radiant skin through personalized care in a comfortable and professional environment.

REBECCA HAZEN, RN, FNP

NP Nurse Practitioner

Rebecca Hazen is a dedicated Nurse Practitioner at Lifestyle Physicians, specializing in integrative healthcare. With over 10 years of experience, including a strong background in emergency room care, she brings both clinical expertise and a compassionate approach to patient care. Rebecca follows a patient-centered philosophy, focusing on the connection between mind, body, and overall well-being. She develops personalized treatment plans by combining conventional and complementary therapies, helping patients achieve balanced and long-term health outcomes.

Known for her empathetic nature, Rebecca creates a supportive and comfortable environment where patients feel heard and involved in their care. She emphasizes open communication and encourages patients to take an active role in their health decisions.

With additional experience in health and fitness coaching, Rebecca supports patients in building sustainable lifestyle habits and reaching their wellness goals. Her approach is rooted in education, empowerment, and a commitment to helping individuals live healthier, more balanced lives.

NATASHA FRISK, CHNP, CHH, CHN

Herbalist | Digestive Nutrition Specialist ​ | Certified Holistic Nutritional Practitioner

As a Functional Holistic Nutritionist, Herbalist, and Certified Health Coach, she is dedicated to helping women restore balance through personalized nutrition, herbal support, and sustainable lifestyle changes. At Lifestyle Physicians, she specializes in nutritional counseling, customized meal planning, and educational programs designed to support long-term wellness.

She works closely with women experiencing hormonal imbalances, perimenopause, postmenopause, PCOS, diabetes, and those seeking effective weight loss and energy optimization. Her integrative approach focuses on the connection between mind and body, offering practical guidance to support healing, metabolism, and overall vitality.

Her services include one-on-one and group nutritional counseling, personalized meal planning, and herbal education. She provides targeted support for hormone balance, blood sugar management, digestive health, and exercise-based nutrition, helping patients achieve sustainable and meaningful health improvements.