Welcome to
Jillian Greaves Functional Nutrition and Wellness

A place for women seeking supportive, personalized solutions for their hormone and digestive symptoms.

It's our mission to empower women to take back control of their health, to eliminate their symptoms naturally, and to experience life at its fullest potential.

Our Approach


Food is one of our most powerful tools in the prevention and management of disease. We also live in a culture where different diets and products are being marketed to us every day, along with conflicting nutrition messages that make deciding what to eat stressful and confusing.

As Functional Medicine Dietitians and Women's Health Specialists, we help women identify and address the root causes of their hormonal and digestive symptoms using advanced lab testing, personalized nutrition and supportive lifestyle therapies as the first line of intervention.

We’re best known for our whole-health approach and our ability to support and empower women in eliminating their hormone and digestive health symptoms naturally...WITHOUT restrictive diets, my fitness pal logging, or missing out on foods that you love.

About_Approach.jpg

We practice functional medicine nutrition and utilize cutting-edge research to provide exceptional care to women in an environment that is always supportive and empathetic.

From chronic low energy to debilitating digestive and skin issues to horrible PMS and irregular cycles, we know firsthand what it's like to have your symptoms dismissed by providers and to be told that everything is fine or to "just take birth control."

After years of education and advanced training, healing our own bodies, and working with over 1000 women in our programs to transform their health, we know what works.

Here's How We'll Do It

Here's How We'll Do It

About_Values_1.jpg

01/ Know, nourish, and heal.

Understanding the WHY behind your unique symptoms and having a clear blueprint for how to support your body’s needs it’s the first step to healing your symptoms naturally.

We’ll utilize our clinical expertise combined with advanced functional lab testing to uncover the root causes of your symptoms. Together we’ll develop a plan of action and support you with implementing targeted nutrition and lifestyle strategies. You’ll learn how to tap into your body’s innate wisdom and develop confidence in exactly how to nourish your body for effective healing.

About_Values_2.jpg

02/ Live life in the grey.

Health is rarely ever black-and-white and we know the rigid + restrictive diets don’t work. Work with us to find flexibility and to establish sustainability as we find the right balance to support and nourish your body from all angles.

Remove the guilt and ditch the extremes of diet culture messaging to achieve whole body health and establish a personalized pattern of eating that allows you to fully engage in life while also achieving optimal health.

About_Values_3.jpg

03/ Align your whole self - body and mind.

Stop living in a cycle of punishment and deprivation in pursuit of health and wellness. Dig deeper by listening to your body and align your actions and mindset to support purpose driven behavior change.

Change the way you look at health from the cultural norms of restriction and bandaid approaches. Confidently identify and heal your symptom root causes and learn to operate from a place of abundance.

About_Values_5.jpg

04/ Find your answers, and reclaim your life.

You deserve the answers to a life free from unpleasant symptoms and stress around food!

Let’s put you back in the driver’s seat of your health.

Meet The Functional Medicine Dietitian Team

Jillian Greaves MPH, RD, LDN

Jillian is a Functional Medicine Dietitian, Women’s Health Specialist, and the owner of Jillian Greaves Functional Nutrition & Wellness.

Street Cred:

  • Bachelor of Science in Human Nutrition & Dietetics from the University of Massachusetts Amherst

  • Master’s Degree in Nutrition from Tufts University

  • Dietitian Training and supervised practice completed at the University of Michigan

  • Trained in Functional Medicine & Functional Medical Nutrition Therapy

  • Worked in Clinical Nutrition Research at the USDA Human Nutrition Research Center on Aging

  • Former Outpatient Dietitian at Boston Medical Center’s Endocrinology, Diabetes, and Weight Management Clinic

  • Extensive training and experience in Women’s Health

Courtney Cayer RD, LDN

Courtney is an Integrative Functional Medicine Dietitian, Women’s Health Specialist, and Lead Practitioner at Jillian Greaves Functional Nutrition & Wellness.

Street Cred:

  • Bachelor of science in human nutrition & dietetics from the University of Massachusetts Amherst

  • Dietitian training and supervised practice completed at Mass General Hospital

  • Trained in functional medicine and functional medical nutrition therapy.

  • Former dietitian at Fuel For Life - a functional medicine telehealth nutrition company

Isabel Fay RD, LDN

Isabel is an Integrative Functional Medicine Dietitian, Women’s Health Specialist, and Practitioner at Jillian Greaves Functional Nutrition & Wellness.

Street Cred:

  • Bachelor of Science in Nutrition and Wellness from Simmons University 

  • Dietitian training through Priority Nutrition Care Distance Dietetic Internship

  • 2 years of applied and practical functional nutrition experience at a private Functional Medicine practice

  • Training in integrative and functional nutrition at the Integrative Functional Nutrition Academy