We have a team of dietitians to help you succeed at

whatever your health goal might be!


 We are trained in a variety of expertise and experience

with many different health conditions.

Please see some of our area of specialities below

and then click book an appointment to view that clinician's schedule.

Weight management: Gain, loss, maintain

Sport & exercise performance

Metabolic syndrome

Diabetes, pre-diabetes, type 1&2, gestational

PCOS & female specific nutrition

Bariatric surgery pre/post op

Food allergies and intolerances

Gut health: IBS, Colitis, Crohn's

Thyroid health: Hashimoto's, low/hypo & high/hyper thyroid

Heart health: High cholesterol, high blood pressure, high triglycerides, heart disease

Vitamin & mineral deficiencies

...and more! 



Marley Oldham Carnes

Business Owner

Registered Dietitian Nutritionist

My passion is to help others create sustainable habits that improve their health and quality of life.

Weight Management & Exercise Performance

Mood & Food Connection

Heart Health

Marley has helped hundreds of people transform their lives through improved fitness and realistic nutrition strategies that improve health and overall wellbeing. She is a Registered Dietitian Nutritionist with a background as a Certified Strength and Conditioning Specialist and CrossFit Level 2 Coach. She holds Bachelors of Science in Dietetics from Texas A&M University, a Masters in Nutrition from Kaiser University and as like all Registered Dietitians she has completed an intensive professional internship and passing of a national board exam.


She had the honor of serving our military members deploying as a civilian on board the USS Harry S. Truman as their Navy “Fit Boss”. She met her husband, John Carnes, in Yokosuka, Japan at the CrossFit gym on base where she was the Navy Fitness Director. She now runs Marley Nutrition and Fitness based in her hometown of Frisco, Texas. She works as a medical provider for nutritional counseling with a focus on fueling for optimal performance, the importance of eating patterns and mental health, and specializes in weight management. Her passion and commitment is to motivate and help others implement realistic and individualized healthy habits that are sustainable and enjoyable!

Through practical steps with nutrition, fun, and effective movement, everyone can reach their goals! 


Melissa "Missy" Croyl

Clinician, Registered Dietitian Nutritionist, Certified Personal Trainer and Yoga Instructor

RD, LD, RYT 200, CPT

Weight Management Meal Planning & Exercise Performance
Blood Sugar Control (diabetes, pre-diabetes, insulin resistance) 
Intuitive Eating & Finding Food Freedom
Gut Health


Missy has been helping men and women with their fitness and wellness journey the past 10 years, serving as a dietitian, yoga instructor and personal trainer in the DFW area and Houston. Her passion for helping clients ditch the expensive and restrictive yo-yo dieting cycle has led her to Marley Nutrition and Fitness, where she teaches others how to make their favorite foods fit into their lifestyle while aligning with their weight and health goals! 


Outside the clinic, Missy enjoys helping people find their dream homes and investment properties, playing volleyball, and going to the dog park with her pup! 


Seeing clients become stronger, energized, happy, and more confident is the reason I love my job!

Weight Management & Exercise Performance

Habit Building 

Young Adults/Teens/Pediatrics

Abby McNatt

Clinician, Registered Dietitian Nutritionist

Abby has always had a passion for nutrition and fitness.  Whether it was playing sports, traveling to national parks, or her favorite spin class, staying healthy and a fun life have always gone hand in hand.  Upon deciding to make a career out of her passion, Abby attended Texas Tech University where she earned a B.S. in Nutrition and Dietetics and where she is currently pursuing a Master’s degree in Nutrition.

Abby’s goal as a Registered Dietitian is to help others live life to the fullest.  She knows this can be done when we prioritize our health and create sustainable habits.  Getting to see her clients become stronger, happier, more energized, and more confident is the reason why she loves her job.  


Here to help clients heal their relationship with food and themselves!

Katlin Stanley

Clinician, Registered Dietitian Nutritionist


Weight Management, Mood & Food Connection

Katlin has had a passion for helping others since a young age. As she grew up, she realized her love for nutrition and fitness could align with this passion. Katlin attended Texas Woman’s University where she earned her B.S. in Nutrition & Dietetics, is currently pursuing her M.S. in Nutrition from Lamar University, and is excited to continue learning by working with the community.

As a Registered Dietitian, Katlin hopes to help others attain a fulfilling, high quality life through individualized care. She believes this can be achieved through creating sustainable goals, healing relationships with food, and making healthy habits fun!


Take care of your body.

It's the only place you have to live.

Associates of Science in Business Administration

Ashley Appleby

Patient Care Coordinator, Billing Administrator 

and Social Media Manager

Ash is an enterprising, dynamic, and performance driven rockstar known for attention to detail in managing high-volume corporate-level environments requiring the ability to prioritize and maintain consistent and efficient organization. Growing up in Chicago provided her with an assortment of food options for living a healthier and fulfilling life - when you put your mind to it, the possibilities are endless! In her personal life, Ash is a lifestyle photographer who enjoys capturing beautiful moments while traveling the world with her quirky husband and amazing daughter.