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NYS Certified Dietitian-Nutritionist (CDN), Registered Dietitian Nutritionist (RDN), MS, CNS • Long Island, Queens, New York & Online
  • AboutAbout Nancy Nancy Mazarin is a Registered Dietitian (RD) and Certified Nutritional Specialist (CNS) with a Master’s Degree in Nutrition from Columbia University. She is also a Certified Dietitian Nutritionist (CDN) in the State of New York. Nancy’s career path has always been in the science field, starting as a researcher at the Albert Einstein College of Medicine. Her love of science, combined with her interest in nutrition, eventually led her to pursue her Master’s Degree. In her endeavors, Nancy has worked as a medical nutrition consultant for hospitals and physicians, taught college-level courses and reviewed scholarly nutrition education articles. Nancy has worked with hundreds of patients, helping them to understand the ever-changing science of nutrition and create programs that are tailored to their own health goals. Included in these individualized plans are education, meal planning and behavior modification. As a food and nutrition expert, Nancy translates the science of nutrition into practical everyday solutions. DEGREES B.A. with a major in biology M.S. in nutrition from Columbia University R.D. from the American Dietetic Association CNS: Certified Nutrition Specialist (American College of Nutrition) CDN: Certified Dietitian Nutritionist (New York State certification) MEMBERSHIPS American Dietetic Association Diabetes Care and Education practice group…
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A Long Island Dietitian Nutritionist explains the Benefits of Time-Restricted Eating: Chrononutrition and Weight Loss

Beautiful Thanksgiving Table of Empty Place Setting with Decor Intermittent Fasting

As a NYS certified dietitian nutritionist, I work with many individuals who need to manage their weight as well as health issues such as diabetes and cardiovascular disease (cardiometabolic diseases). In my last blog I explained and discussed Chrononutrition. Now I can expound on the relationship to and potential benefits of time time-restricted eating.

Let’s start with basics: Weight gain occurs when energy intake exceeds energy expenditure, and these excess calories from food are stored as fat. But new research suggests this is not the entire story. What has been observed for a long time, but poorly understood, is that overnutrition can disrupt circadian rhythms (as explained in the previous blog), and these internal clocks will then disrupt metabolism.
As Dr. Joseph T. Bass, professor of medicine at Northwestern University Feignberg School of Medicine, says “It is well known, albeit poorly understood, that insults to the body clock are going to be insults to metabolism.” Moreover, Bass continues to say that “our clock gets scrambled”, particularly with a diet high in fat with highly refined carbohydrates, a western diet.
Though eating meals and/or snacks late in the day has been linked to an increased risk of obesity for some time, it has been unclear whether this is caused by changes in hunger and appetite, energy expenditure, or both, and whether molecular pathways in adipose tissues are involved. The findings of recent research show that all these factors converge and result in positive energy balance and increased obesity. Thus, the circadian timing of food intake alters energy intake, expenditure, and storage, increasing the probability of weight gain.

To put it simply, there is a link between weight gain and late-night eating. As a Long Island RDN, I work with patients to help them lose weight and promote health. Nutrition therapy includes modifying and moderating what patients eat as well as their eating behaviors and practices.

In summary, there is a relationship between the internal clock (circadian rhythm) and an individual’s metabolism and weight. For those having difficulty with weight management, these studies support the use of Time-Restricted Eating.

Further reading:

  • Science Daily
  • Science Magazine
  • Cell Metabolism, Volume 34, Issue 10, 4 October 2022, Pages 1420-1421, 1486-1498.e7
  • Adafer R, Messaadi W, Meddahi M, Patey A, Haderbache A, Bayen S, Messaadi N. Food Timing, Circadian Rhythm and Chrononutrition: A Systematic Review of Time-Restricted Eating’s Effects on Human Health. Nutrients. 2020; 12(12):3770. https://doi.org/10.3390/nu12123770  PMID: 33302500; PMCID: PMC7763532.
  • Oike H, Oishi K, Kobori M. Nutrients, Clock Genes, and Chrononutrition. Curr Nutr Rep. 2014 Apr 27;3(3):204-212. doi: 10.1007/s13668-014-0082-6. PMID: 25101217; PMCID: PMC4118017.
  • Duszka K, Wahli W. Peroxisome Proliferator-Activated Receptors as Molecular Links between Caloric Restriction and Circadian Rhythm. Nutrients. 2020; 12(11):3476. 
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https://mazarinrd.com/wp-content/uploads/2022/11/FoodClock-2_Nov-15_2022-scaled.jpg 1703 2560 Nancy Mazarin https://mazarinrd.com/wp-content/uploads/2025/03/NancyMazarin-2-1030x281.png Nancy Mazarin2022-11-16 10:45:122022-11-22 14:39:56A Long Island Dietitian Nutritionist explains the Benefits of Time-Restricted Eating: Chrononutrition and Weight Loss

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Amy Pedolsky
17:02 26 Dec 22
Over the past six months that I have been seeing Nacny, she has been very helpful in hepling me lose 31 pounds. She understands very aspect of what I needed and how to accommidate them properly. With Nancy's help I have been able to change my lifestyle, eat healthier and change and treat my medical conditions very differently and for the best. I would highly reccommanded Nancy to anyone that has tried diets before and has not succeded and who has a lot of different medical conditions that make it difficult to know what to eat and what not to eat.
Michael Maino
21:11 17 Dec 22
I was hesitant at first to start seeing a nutritionist. I was very comfortable with my poor eating habits despite being upset about my weight; however I knew I needed to make a change.

Nancy was very understanding from the start. Before meeting with Nancy, I had been in a constant cycle of over-restricting myself to lose weight rapidly, followed by binge eating and gaining it all back plus some more.

Over the past year and a half, Nancy has helped me discover normal eating. She helped me understand my hunger and my fullness in addition to helping me choose better food options.

Nancy is very dedicated to working with you and helping you achieve your goals. She doesn’t just help you reach your goals — she helps you change your perspective of food and eating for the better. What you learn with Nancy is not temporary — you will carry it with you and practice it throughout your life.

I have lost almost 70 pounds since first meeting with Nancy and continuing on my journey. I highly recommend working with her.

Nancy, thank you for all of your help!
Carol Vogt
21:38 12 Dec 22
Although I was unlucky when I developed some health issues, I was very lucky to find Nancy Mazarin, a skilled, intelligent, caring nutritionist. I saw lots of doctors but she was the one who came up with the diagnosis that finally led to my improved health. She was always available when I had questions and was even willing to meet with me one weekend when I was struggling.
Bonnie Eisler
00:22 03 Dec 22
Nancy has been wonderful to work with. She is extremely knowledgeable about nutrition, and very intuitive in identifying and removing roadblocks her clients may be experiencing on their way to achieving their goals. Nancy is extremely organized and promptly keeps her appointments. I highly recommend her!
richard markx
02:55 11 Oct 22
Absolutely knowledgeable compassionate and very personable!
Anyone wishing to improve their health through nutrition and education will find Nancy Mazarin incredibly helpful Thank you for all your help Nancy!
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