Hi, I’m Isabel! I’m a passionate, life-long health and wellness lover and am living the dream I’ve imagined since I was 11. All my life I’ve had a profound passion to help people be well and thrive and have found that food can really be healing and health-promoting if we allow it to be.

As a child, I had chronic stomach aches and a million food allergies (red foods, eggs, wheat, dairy)- and I was also an athlete, so finding food that worked for my body and felt good at the same time was (and is) always really important to me. Though I’ve certainly had my own food struggles, throughout my teens, twenties, and into my thirties, I’ve certainly found a wonderful place for the food that makes my body and mind feel good, and especially for my dessert (if you follow me on social media you’ll see that!).



My philosophy is built on the premise that most of our bodies do better with more plants, more movement, and fewer processed ingredients, but the specifics of how each of us lives are completely different because we all have different needs.

I/we work with each of our clients closely to help them feel their best by taking a personalized approach and blending functional, holistic, and integrative medicine. We recognize that everyone (and their bodies) are different which is why we help our clients to listen, learn from, and provide for their bodies. In this process, clients will improve their relationship with food and themselves, thereby enabling healing so they can achieve their health goals (whatever they may be!).

I’m so excited for you to learn more about how me and my team can help you live a happier and healthier life!


Isabel Smith, MS RD CDN, is a nationally recognized Registered Dietitian, Health and Lifestyle Expert, Investor, and Entrepreneur. She is the CEO and founder of Isabel Smith Nutrition and lives in New York City.

Isabel holds a Registered Dietitian License, a Bachelors of Health and Exercise Science from Gettysburg College, and a Masters of Science in Nutrition Communications from Tufts University. Isabel was trained in all areas of clinical nutrition at New York Presbyterian Hospital in New York City and has worked with patients at other highly esteemed Academic Medical Centers including Dana Farber Cancer Institute, and Hospital for Special Surgery. Throughout her training, Isabel also trained under some of the best Integrative and Functional Medicine Dietitians and Clinicians and uses her Integrative and Functional Wellness training together with her clinical background when working with clients and groups.

In her private practice, Isabel works with clients in the areas of functional and integrative wellness in the areas of hormonal balance, weight loss and intuitive eating, allergies and immune health, weight loss, thyroid health, digestive health (celiac, IBS/IBD, allergies and sensitivities), athletic performance, blood sugar control, and more. In addition to private client work, Isabel also works with corporations and corporate executives to promote healthy eating and mindfulness/stress management (and recently launched a new business Wellfuel, LLC

Isabel sits on the Expert Advisory Board of Eat This, Not That, and also MBODY 360, and her expert opinion is often featured in places like Elle, Mind Body Green, Readers Digest and more.  Isabel is also an advisor and consultant for various food and health-minded brands (in the past Isabel has worked with Anheuser-Busch, KIND, Biotta Juice, Caesarstone, Liebherr Appliances to name a few).

In her spare time, Isabel can be found making new recipes, trying various new exercise classes, practicing yoga and running in Central Park with her Yorkshire Terriers, Sasha and Henry.


  • B.A. Health and Exercise Sciences, Gettysburg College
  • M.S. Nutrition Communications, Tufts University
  • Dietetic Internship: New York Presbyterian Hospital
  • Oncology Fellowship: New York Presbyterian Hospital


  • Registered Dietitian Nutritionist, Academy of Nutrition and Dietetics
  • Certified Dietitian Nutritionist, State of New York
  • Active Member of Greater New York Dietetic Association
  • Active Member of Academy of Nutrition and Dietetics (Dietitians in Functional Medicine and Nutrition Entrepreneurs groups)
  • Certified Reiki Practitioner, Level 2

Meet Sydney


She's our amazing Registered Dietitian Nutritionist that’s worked with clients for 10 years. She’s also a certified Diabetes Care and Education Specialist (CDCES) for 8 years. Last but not least, Sydney is a board certified Integrative and Functional Nutrition Certified Practitioner (IFNCP). Currently living the sunny life out in California, she is originally from Virginia where she received a B.S. in Nutrition Science from Virginia Tech and an M.S. in Nutrition Science from East Carolina University. When not working with clients, you may find Sydney out hiking with her dog or at a local music festival.

 Meet Lisa


She’s the team’s jack of all trades. She’s also the first person you will speak with when you book a call to learn more about working with us. Lisa has spoken with hundreds of ISN clients and potential clients. Schedules, operations, and strategy are some other things she helps out with here at ISN. Lisa graduated with a BS from Cornell University and has an MBA from Yale.

Meet Kier


He’s our social media guru. Behind the scenes he’s making us look good ;) Kier is the one who stays up all night to make Isabel’s dancing pop. You may speak to him in our DM’s… if so, be sure to say hi!



We help men and women of all ages live healthier and happier lives by focusing on the whole person – your individual needs, lifestyle, mental health, and goals.