Registered Dietitian Nutritionists Fueling CrossFit Athletes to

Optimize Performance, Master Macros, & Achieve Ideal Body Composition

Virtual Insurance Covered Nutrition for CrossFitters often at no cost

Are you CrossFit Serious or CrossFit Causal?

Whether you're eyeing the podium at your next comp or aiming to stay injury-free for the long haul, we tailor nutrition to fuel your CrossFit goals.

For the Competitive Edge

CrossFit Serious – Fuel to Win

Personalized guidance and support to help you achieve your health goals through tailored meal plans and macros from our expert Registered Dietitian Nutritionists who understand and can relate to the needs and demands of your workouts.

CrossFit Casual – Tailored Nutrition and Macros to Stay Strong, Injury-Free, and Energized

Feel Fit for Life

Are you a CrossFit enthusiast focused on maintaining strength and staying injury-free? You want to feel good, maintain your fitness, and recover quickly so you can enjoy each workout without burning out or getting hurt. You'll learn how to fuel your body properly, stay energized, and keep your body composition on point—without feeling restricted.

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The Best of Both Worlds – Achieve Balance and Sustainable Results

Feel Your Best, Whether You’re All-In or Taking It Easy

You don’t have to choose between pushing your limits and maintaining a balanced approach to fitness. Whether you're toggling between competition prep and off-season maintenance or simply want to feel good year-round, we create tailored nutrition plans that adapt as your focus shifts. Whether you’re in competition mode or simply training for fun, we'll help you feel your best and keep you on track—without sacrificing the foods you love.

Learn More about Our Services

Why CrossFitters Choose

RX Nutrition and Fitness

Insurance covered virtual one on one nutrition and macro planning to optimize performance, recovery and overall health often at no cost.
Expert guidance from Registered Dietitian Nutritionist who are experienced CrossFitters themselves who have extensive expertise and education in sports performance nutrition.
Interactive resources, community, accountability and support with our RX Fitness FUEL membership and accountability program to deepen your understanding and commitment to get to your results sooner and build long term sustainable habits.

Check My Insurance Coverage

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We are Registered Dietitian Sports Nutritionists At Your Fingertips Often At No Cost!

No matter if you're a serious CrossFitter aiming to win or a casual athlete focused on long-term health, our Registered Dietitian Nutritionists are here to guide you.

Ready to fuel your journey?

Contact us today for a personalized consultation and discover how you can feel your best at every stage of your CrossFit journey.

Get Started Today!

CrossFit Medical Society™ Provider

The CrossFit Medical Society™ (CFMS) is a vibrant community of healthcare professionals dedicated to enhancing the health and performance of CrossFit athletes. CFMS serves as a vital bridge between the fitness and medical realms, offering a comprehensive network of providers who understand the unique physical demands and lifestyle intricacies of CrossFit.

As a proud Provider for CFMS, we leverage this specialized expertise to deliver tailored care that meets the distinct needs of our clients. Our affiliation ensures we remain at the forefront of best practices and evidence-based nutrition, empowering athletes to optimize their training, recovery, and overall well-being.

CFMS is not just about healthcare; it’s about fostering a proactive approach to wellness. By decentralizing healthcare and promoting personal responsibility, we aim to help individuals regain control of their health journeys. Our network provides invaluable resources, tools, and access to healthcare professionals who prioritize the importance of lifestyle and community in achieving health goals.

Members benefit from access to a diverse directory of over 50 clinical specialties, monthly newsletters featuring insights from providers, and ongoing education to ensure they are equipped with the latest knowledge and skills. Together, we are redefining healthcare, making it more responsive to the needs of individuals engaged in CrossFit and related disciplines.

For more information, click the button below to visit CrossFit Medical Society website

CrossFit Medical Society

Our Dietitians Who CrossFit

At RX Nutrition and Fitness, our dedicated professionals are committed to empowering you by optimizing your athletic performance, avoiding injury, and achieve peak fitness by learning to fuel with the right foods at the right time.

Marley Oldham Carnes

Founder and CEO

Registered and Licensed Dietitian Nutritionist

CrossFit L-2 Coach

Favorite CrossFit Competitions:

The Open
The Fittest Experience
Battle on The Border
BCS Classic
Wodapalooza

Jennifer Holmes

Registered Dietitian Nutritionist

Registered Nurse

Experienced CrossFit athlete for 8 years working her way through the open quarterfinals

Leron Sarig

Registered Dietitian Nutritionist

Board Certified Specialist in Sports Dietetics

Former San Francisco Giant's Performance Dietitian and over 10 years of experience with athletes
Active CrossFitter for over five years

Learn More About Our Registered Dietitian Nutritionists

Fuel Your Knowledge: FAQ

Why should I work with a Registered Dietitian Nutritionist?

Partnering with a Registered Dietitian Nutritionist (RDN) will transform your health journey. We offer personalized nutritional care that addresses your unique needs and goals. With a focus on both dietary choices and lifestyle habits, we will provide you a holistic approach that fosters sustainable changes for your improved health, well-being, and performance. We specialize in tailoring your nutrition and meals plans for your specific macros you need to fuel your workouts to perform better, recover faster, and reach your ideal body composition.

What does insurance cover?

Insurance covered time spent in nutrition sessions with your dietitian. Therefore, any requests for meal plans, macros, grocery lists, food log reviews, etc. are completed in session with you which also allows our dietitians to provide better feedback and food/meal plans that are tailored to your specific preferences and needs.

What is your pricing if my insurance doesn't cover sessions or I don't have insurance?

Most of the time, NOTHING with your insurance plan! We rarely see self-pay patients, but if for some reason you do not have insurance, our self-pay rates are $190 for a 90-minute initial session and $90 for a 60-minute follow-up session. We offer discounted pricing for more frequent visits and shorter visits.

What is RX FUEL membership program?

It is a membership portal and educational course that allows you to connect with others for added accountability and motivation, stay on top of the latest trends, fads with new content and receive evidenced based recommendations by our expert sports dietitians. Learn more here.

How long are nutrition virtual sessions?

Initial Visit: 90 minutes

Follow Up Visits: 60 minutes

However, depending on your schedule and accountability needs, you may schedule 30, 45, 60, or 90-minute follow-up sessions as determined with your dietitian at your initial visit.

How often do I meet with my Dietitian?

Our most successful athletes meet regularly with their dietitian. Some do really well with a weekly visit for 15–30 minutes for an accountability check-in, while others enjoy a little more direction followed by a hands-off approach. Usually, we suggest weekly visits for the first six weeks, then once or twice a month after that. Our clients usually view our visits as preventive and continue with us for quarterly check-ins even after they have met their fitness and body composition goals.

We Have Worked with Thousands of Athletes: Here Is What They Are Saying

Guillermo P.

North Frisco CrossFit

"I have worked Marley and her team for over 4 years. Through recurring nutrition sessions and the added accountability, I was able to improve my annual lab work results drastically, become leaner, while also improving in my workouts and with more energy! We analyzed my intake and tailored my macros to the specific demands of the programming cycles, competitions, optimizing recovery healing and preventing injury with the right nutrition.

Shanna M.

Sanctum CrossFit

“I know what healthy eating looks like but I felt like I never had the time to cook or meal prep consistently.

I found myself grabbing the kid's snacks or the air fryer chicken nuggets to eat quickly before my next Zoom meeting.

RX Nutrition and Fitness has been given me practical tips and time saving strategies to find a combination of both convenience and health even on the busiest days. "

Amanda S.