Nancy Mazarin, Certified Nutritionist & Registered Dietitian Long Island NY

09/09/2026

Yes, a vegetarian or vegan diet can be very healthy when it is planned well. But neither diet is automatically healthy on its own; overall health depends on the quality of the foods you choose.

On both vegetarian and vegan diets, you eat foods that come from plants. Vegetarians leave out meat, poultry, and fish, but most still eat animal byproducts. Vegan diets are stricter, eliminating all products derived from animals.

08/03/2026

Diet is critically important. It’s not just what you eat, but also when and how often you eat. Learn how to manage chronic constipation in my latest post: https://mazarinrd.com/how-to-manage-chronic-constipation-dietitian-support/

07/20/2026

After a diagnosis of chronic kidney disease, many people feel overwhelmed—especially by the question, “What do I eat now?” The internet is full of conflicting information, and lengthy handouts can be confusing and unnecessary. Working with a Registered Dietitian Nutritionist who specializes in renal nutrition is invaluable for both patients and caregivers.

A Registered Dietitian Nutritionist can help with kidney disease by providing online medical nutrition therapy to slow the progression of the disease, prevent complications, and help patients manage comorbidities. Implement an individualized diet plan with an expert Long Island nutritionist and impr...

07/14/2026

What conditions can a functional nutritionist help manage? Learn more in my recent blog post. Thanks for reading!

A functional registered dietitian nutritionist uses a holistic, root-cause approach to health. Learn how diet, lifestyle, genetics, and environment work together to influence wellness and discover how personalized nutrition therapy can support your health goals.

06/30/2026

What is intermittent fasting and three of the most common approaches on my latest blog:

Intermittent fasting can be an effective dietary strategy for weight loss, blood sugar management, and reducing inflammation. A Long Island dietitian explains the benefits, limitations, and how to determine whether intermittent fasting is right for you.

06/08/2026

Food is not “good” or “bad.” It exists on a spectrum from least healthy to healthiest. Carbohydrates are essential for health. The key issue is the type of carbohydrates you choose. Learn the truth about carbs: https://lnkd.in/eBTjBQQD

05/27/2026

The numbers are alarming. Colorectal cancer rates are at an all-time high, and The Cancer Research Institute reports that “1 in 5 diagnoses occurs in someone under the age of 55.”� Learn more in my latest blog:

Discover the best diet to help prevent colon cancer with a Long Island dietitian’s evidence-based guide. Learn how high-fiber foods, plant-based proteins, and limiting processed foods can significantly lower your risk. Improve digestive health and reduce inflammation with expert nutritional insigh...

04/28/2026

Your diet significantly impacts bone health. It’s not just about what foods you need to eat, but also which foods should be limited:

When people think about bone health, it’s common to reach for a glass of milk or a calcium supplement combined with vitamin D. Bone health, however, doesn’t come from just two nutrients in isolation. It’s about overall dietary patterns—and, when appropriate, supplementation. That is a bone-h...

04/24/2026

Many people use the terms “dietitian” and “nutritionist” interchangeably. Though all Registered Dietitians (RD/RDN) are nutritionists, not all nutritionists are dietitians.
Dietitians and nutritionists are distinct professions. Learn more in my recent blog: https://mazarinrd.com/should-i-see-a-dietitian-or-nutritionist-to-lose-weight/

04/20/2026

What is IBS and what is the best diet? Learn more in my recommendations to manage and resolve Irritable Bowel Syndrome:
https://mazarinrd.com/what-is-the-best-diet-for-ibs-long-island-dietitian-tips/