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! 


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

Marley Oldham Carnes, Owner, Registered Dietitian Nutritionist

  • 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!


Missy believes that through practical steps with nutrition and fun, effective movement, everyone can reach their goals! 

Melissa "Missy" Croyl, Clinician, Registered Dietitian Nutritionist
Certified Personal Trainer, Yoga Instructor​​

  • 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! 

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

Abby McNatt, Clinician, Registered Dietitian Nutritionist

  • Weight Management & Exercise Performance

  • Habit Building 

  • Young Adults/Teens/Pediatrics

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.  

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Charlie Tapken, Clinician, Registered Dietitian Nutritionist

  • Weight Management

  • Family & Prenatal Nutrition

  • Breastfeeding and lactation

Charlie is a licensed Registered Dietitian Nutritionist. She earned her Master of Science in Nutrition and Dietetics from Texas Tech University and is currently pursuing a Master of Advanced Study in Maternal and Child Nutrition from the University of California, Davis. Charlie has a passion for working with pregnant women and children to achieve optimal nutrition and create a healthy relationship with food from the beginning.