Get Ready for a Healthier Life!
Registered Dietitian Nutritionist (RDN)
NYS Certified Dietitian-Nutritionist (CDN)
Nassau County, New York & Nationally Online
Nancy Mazarin is a nutrition consultant with a private practice in Great Neck, New York, working with patients from Nassau County. She is a New York State Certified Dietitian-Nutritionist and Registered Dietitian Nutritionist with a master’s degree from Columbia University. Her focus is on health, wellness, and sustainable lifestyle choices. With thirty years of experience, Nancy employs practical nutritional tools to create long-term solutions while working closely with health professionals and patients on a full spectrum of medical conditions and nutritional needs.
Nancy works with individuals from Nassau County, Suffolk County, North Shore Long Island, South Shore Long Island, Queens, statewide, and nationally, providing virtual nutrition consultations.
Food provides the fuel for your body and the nutrients for your health. Nancy provides personalized nutrition counseling, which is rooted in the concept that one size never fits all. Her diet and lifestyle recommendations focus on optimizing health and disease prevention. Nancy provides treatment for many issues, including:
When you face medical issues such as diabetes, irritable bowel syndrome, conditions that challenge your physical and mental well-being or energy levels, diet is often the cornerstone of treatment, and proper nutrition is a powerful tool to restore your health. Patients with medical conditions and their associated symptoms are often referred to Nancy by physicians and healthcare professionals in Long Island, Queens, and the Greater New York area. Nancy works with your doctor using an integrative approach to understand your nutritional and medical needs. She translates research into practice and develops your individualized intervention program.
Working with a certified nutritionist and registered dietitian is an essential part of your comprehensive health care, enabling you to optimize health and well-being. During your initial nutrition consultation, Nancy will evaluate your current eating practices, as well as your home, work and social environment, and identify which areas need improvement and where good choices and habits already exist. Nancy‘s expertise will provide:
Registered Dietitian Nutritionist (RDN)
NYS Certified Dietitian Nutritionist (CDN)
Nassau County, New York & Online
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Nancy Mazarin2026-01-01 10:00:592026-01-12 12:38:17How to Lose Weight Sustainably in the New Year: Dietitian Tips
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Jen Rolston2025-11-15 10:00:552025-12-15 16:18:28Holistic Diet Myths Debunked by Long Island Dietitian Nutritionist
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Nancy Mazarin2025-10-14 16:18:372025-10-16 13:59:13What is the Best Diet for Vegetarians, Long Island RDN TipsWhat is the difference between a dietitian and a nutritionist?
Dietitians, like Nancy, are professionals who must complete rigorous education and certification requirements. They are the only qualified experts to provide medical nutrition therapy (MNT). Dietitians possess the critical skills to analyze medical records, lab results, and dietary assessments, applying evidence-based practices to develop effective nutrition strategies. Nutritionists, on the other hand, may not require any formal education or certification, depending on their region.
Is it worth paying for a nutritionist?
When you work with Nancy, you’re getting more than a meal plan — you’re investing in personalized, science-based support tailored to your health, goals, and lifestyle. RDNs are the only licensed professionals qualified to provide medical nutrition therapy for conditions such as:
How do I choose a nutritionist or dietitian?
Choose a NYC-certified nutritionist or registered dietitian with credentials from one of these boards: the Certification Board for Nutrition Specialists (CNS) or the Clinical Nutrition Certification Board (CCN). Both require a master’s degree in nutrition (or a related field) and supervised practical experience before certification.
What is a holistic nutritionist?
“Holistic nutrition” is a practical approach to healthy living that considers the whole person — physical, emotional, and mental well-being. As a dietitian, Nancy practices holistic nutrition, focusing on education: understanding where food comes from, making healthier choices at the market, reading labels, and recognizing how different foods affect the body — all with an emphasis on balanced, whole-food eating.
If you’ve worked with Nancy, she’d love to hear your feedback. Your review not only helps others find trusted nutrition care but also helps Nancy continue improving and personalizing her services. Thank you for sharing your experience!
