SOZO
Holistic Nutrition
Hi, I’m Haley Castellano, founder of Sozo Holistic Nutrition. My Greek roots instilled in me a deep love for food, health, and the power of nourishment from a young age. I always joked that I went to school just to tell people to follow the Mediterranean diet—and while it's more complex than that, there’s a lot of truth to it.
I hold a bachelor’s degree in Health Science and Nutrition, and a master’s degree in Clinical Nutrition (MSCN). I am a Certified Nutrition Specialist (CNS)—the highest credential for personalized nutrition in the United States. With over eight years of experience in the nutrition field, I am deeply committed to restoring optimal health to the Massachusetts community.
My passion for functional nutrition came from my own health journey—years spent in the Western medical system searching for answers. I felt overdiagnosed and under-cared for, given labels without real solutions. Too often, we’re told, “You have ___”, followed by a prescription, rather than support understanding, “Why do I have this? How can I heal from this? How can my family prevent this?” Functional nutrition shifts that conversation. It’s about understanding the root causes of imbalance, using food as medicine, and restoring the body’s ability to heal.
The name Sozo comes from the Greek word σῴζω, meaning to heal, restore, and make whole. This philosophy is at the heart of everything we do—addressing health at its root, not just managing symptoms. At Sozo, we bridge science and tradition to create personalized, sustainable wellness solutions that empower you to take control of your health with knowledge, not just prescriptions.
True healing starts from within—when we give the body what it truly needs.
The Philosophy of Holistic Nutrition
Holistic or functional nutrition goes beyond simply addressing symptoms—it’s about restoring balance and healing from the inside out. At SOZO Holistic Nutrition, we believe that true health comes from identifying and addressing the root causes of imbalances in your body, rather than merely masking symptoms. By focusing on your body’s unique needs, we aim to create lasting changes that empower you to achieve long-term vitality.
At Sozo, we take a personalized approach to nutrition that considers your genetics, lifestyle, environment, and health history. This allows us to develop a tailored plan that is as unique as you are. Our philosophy is grounded in the belief that health is a journey, not just a destination—one that’s rooted in whole-body healing and preventative care.
Here’s how functional nutrition at SOZO differs from traditional approaches:
Root Cause Resolution: We look deeper than surface-level symptoms, focusing on identifying and correcting the root causes of imbalances in your body.
Personalized Care: Your health plan is designed specifically for your unique needs, using a holistic, individualized approach that supports your overall well-being.
Sustainable Change: Our goal is to help you make meaningful changes that will last, empowering you to live with vitality and resilience.
Preventative Wellness: We prioritize proactive care to help you prevent future health issues and maintain optimal health over the long term.
At SOZO Holistic Nutrition, we believe that healing means more than just treating illness—it’s about restoring your whole self to a place of wholeness and balance. Our functional nutrition approach is designed to help you feel your best, not just today, but for the years to come.
Specialized Care for Niche Condtions
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Navigating Avoidant/Restrictive Food Intake Disorder (ARFID) requires a highly individualized and compassionate approach. My expertise lies in uncovering the root causes of food aversions, sensory sensitivities, and nutritional gaps—providing a structured yet flexible path toward expanding food variety, restoring nutritional balance, and fostering a healthier relationship with eating. Through personalized strategies and step-by-step support, I help clients move beyond restrictive patterns in a way that feels safe, sustainable, and empowering.
Join my ARFID Support & Resource Community called the ARFID Support Circle—a professional online group providing education, food ideas, peer discussions, and monthly live calls for recovery support. This is a general support group, not personalized nutrition counseling. Membership is $22.99/month.
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Overcoming anorexia, binge eating disorder, and disordered eating patterns requires more than just nutrition guidance—it demands a diligent, compassionate, and highly personalized approach. I combine deep clinical expertise with unwavering support, ensuring that every step toward healing is met with both education and empathy. My approach is structured yet adaptable, providing clear guidance, accountability, and evidence-based strategies to help you rebuild a balanced relationship with food while prioritizing nutritional restoration and long-term well-being. I am an engaged, detail-oriented practitioner who will be fully invested in your journey—because you deserve care that is both thorough and deeply supportive.
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I specialize in PCOS management, hormonal balance, and preconception nutrition, providing personalized, science-backed strategies to enhance reproductive health. Whether you're navigating irregular cycles, metabolic challenges, or unexplained fertility struggles, I work diligently to create a plan that nourishes your body, regulates hormones, and optimizes fertility for both women and men. My approach goes beyond generic advice—I offer targeted nutrition, lifestyle adjustments, and diligent support to help you build the healthiest foundation for conception and a thriving pregnancy.
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Alongside my specialized care, I also provide personalized nutrition support for:
Sustainable Weight Management
General Gastrointestinal Concerns (gut dysbiosis, bloating, inflammation)
Anxiety & Mood Support
Autism & Neurodivergent Nutrition Support
My approach is root-cause focused, evidence-driven, and highly individualized to support lasting wellness.