Dr. Mary-Catherine LaBossiere, MPH, RD, LDN, is the registered dietitian and health strategist behind Defy Nutrition.
Mary-Catherine helps women who feel overwhelmed by health advice go from confused to confident with simplified, evidence-based nutrition and practical strategies they can actually use.
With a doctorate in Health Sciences, a master’s in Public Health, a bachelor’s degree in Nutrition, and additional training in integrative and functional nutrition and fertility nutrition, Mary-Catherine brings together research, clinical nutrition, and real-world application. Her approach focuses on looking beyond a single symptom, a single number, or a single food to help clients understand the bigger picture and make informed decisions about their health.
Rather than adding more rules, restrictions, or information to an already noisy health landscape, Mary-Catherine helps clients cut through the noise, identify what matters, and create sustainable changes that fit their actual lives.
As a veteran spouse and mom, Mary-Catherine also understands the realities of navigating health and nutrition in a life that doesn’t always go according to plan. That perspective is at the heart of Defy Nutrition: defy the rules that aren’t serving you, defy the all-or-nothing approach, and learn to eat and live in a way that works for you.
Learn more about the “why” behind Defy Nutrition here.
Mary-Catherine has worked with diverse populations and collaborates with several for- and non-profit organizations.
Defy Nutrition began in Clarksville, Tennessee, as Busy Babes Nutrition. In 2021, we reimagined the business with a new name, brand, and philosophy.
The name Busy Babes reflected a culture we no longer wanted to promote: the idea that being constantly busy was something to celebrate, even when it meant putting our own health on the backburner. We also knew our work had grown beyond serving women. We wanted a name that better reflected who we were becoming and the kind of health support we wanted to provide.
And so, Defy Nutrition was born.
Our mission has always been about more than telling people what to eat. We wanted to challenge the rigid rules, conflicting advice, and all-or-nothing thinking that can make taking care of your health feel so complicated. That philosophy became our original tagline:
Defy the diet rules. Defy yesterday’s you.™
Over the years, Defy Nutrition has continued to evolve alongside the people we serve. What began with nutrition counseling and community workshops has grown into a broader approach to helping individuals make sense of their health, cut through the noise, and turn evidence into practical action.
Today, Defy Nutrition serves clients virtually, making evidence-based nutrition support accessible across state lines. While the business has changed locations, names, and offerings over the years, the goal remains the same: Help people stop chasing the next rule and start making informed decisions that work for their real lives.
Defy Nutrition is about more than breaking rules. It’s about questioning the ones that never made sense in the first place.
We live in a health culture filled with endless “do this” and “don’t eat that” advice. Diet culture turns nutrition into a list of rules, while the internet gives us more information than ever—and somehow makes it harder to know what actually matters.
We believe your health deserves more nuance than that.
At Defy Nutrition, we combine evidence with real life. We look beyond one symptom, one number, or one set of rules to understand the bigger picture and identify what actually makes sense for you.
Because there is no one-size-fits-all approach to health. Your nutrition should fit your body, your goals, your circumstances, and your life—not the other way around.
Our goal isn’t to give you more rules to follow. It’s to help you cut through the noise, understand your options, and feel confident making informed decisions about your health.
Defy Nutrition serves individuals who want to feel better, understand their health, and make informed decisions about nutrition—without another restrictive diet or an endless list of rules.
Our clients often know they could be eating differently, but they’re tired of conflicting advice, overwhelmed by what they see online, or frustrated that what they’ve tried hasn’t delivered the results they were hoping for.
We work with people who are ready for a more individualized approach—one that considers their goals, preferences, circumstances, and real life. Whether you’re looking for practical support with everyday nutrition or trying to make sense of a specific health concern, our goal is to help you cut through the noise and move forward with confidence.
Virtual Nutrition Support
Mary-Catherine provides virtual nutrition services to clients in Massachusetts • Connecticut • Tennessee • Kentucky • Florida • South Carolina • Oregon • Alaska • California • Michigan • Arizona • Virginia • New Jersey • Texas
Because nutrition support shouldn’t be limited by your ZIP code.
Organizations & Community Partners
Defy Nutrition also works with organizations looking to bring evidence-based nutrition education and practical health strategies to their communities, teams, employees, or members.
Over the years, we’ve had the opportunity to collaborate with organizations including 5by5 Performance Therapy, the Pararescue Foundation, the Military Special Operations Family Collaborative, and Sanctuary on Main.
Interested in bringing Defy Nutrition to your organization? Let’s talk.