Marni Sumbal, MS, RD, CSSD, LD/N
Board Certified Sports Dietitian
3x Author
Master of Science in Exercise Physiology
Triathlon Coach
32-year lacto-ovo vegetarian
20x Ironman finisher
2x XTRI finisher (Canadaman - 2nd female, ICON - 2nd female)
2024 Norseman World Championship finisher (9th female)
6x Ironman World Championship finisher

2017 Ironman Chattanooga overall amateur female
2022 5th AG 2021 Ironman World Championship (St. George, Utah)
2022 7-day Haute Route Alps official finisher (2nd AG)
2023 & 2024 Xterra Oak Mountain overall amateur female
2024 4-stage Pe-Plett MTB race - overall solo female winner
2024 IM 70.3 Louisville female winner
2024 Ironman Chattanooga overall amateur female

As an accomplished endurance triathlete and Sports Dietitian with a Master of Science in Exercise Physiology, Marni is a qualified and experienced expert who can assist you in creating sustainable, healthy eating habits with effective fueling practices to enhance your athletic performance while keeping your body and mind in good health. Through her education and athletic success, she brings a unique set of skills, knowledge and experience to help guide athletes on the path to performance excellence by focusing on the human - not just the athlete.

Marni specializes in the following nutrition-focused areas as it relates to athletic performance:

• Daily nutrition

• Sport nutrition

• Plant-based nutrition

• Hydration/electrolytes/cramping

• Nutrient timing

• Reducing/eliminating GI issues - bloating, gas, belching, stomach cramping, headaches, nausea, etc.

• Race week/day fueling

• Creating balanced meals

• Endurance and ultra-endurance sport nutrition - Long distance triathlon, gravel riding, mountain biking, trail running, ultra running, XTRI, Xterra, etc.

• Improving/maintaining a healthy relationship with food and the body

• Meeting energy needs while preparing for an endurance/ultra event

• Application of sport nutrition products

• Analyzing blood work for health and performance improvements (inquire to receive a discount for Athlete Blood Test)

• Staying fueled and hydrated in different environmental and terrain conditions

 
Through her comprehensive consultation services, Marni will assess your current nutrition, fueling and hydration habits, alongside your lifestyle and training regime, in order to provide personalized advice to help you meet the nutrition demands of your sport. With the help of a detailed questionnaire that you will complete before the initial consult, Marni can better understand your typical diet, your past and current sport nutrition strategies and training and your relationship with food and the body to help you unlock the missing links to to help with your athletic development.

Each Trimarni nutrition service will address (as applicable): 

• Optimal meal planning for diet sustainability (no quick fixes, fad diets, extreme eating regimes or dieting)

• Learning how to build a solid foundation of nutrient dense eating

• Learning how to incorporate energy dense foods to support the training load

• Nutrient timing and recovery nutrition to adapt well to training

• Strategies to reduce risk for GI distress, dehydration, extreme fatigue during training and racing

• Hydration and energy needs during training

• Proper application of sport nutrition products

• Ensuring you are eating enough to support your training demands.

• Maintaining a healthy relationship with food and the body

Hi….it’s Marni!
I look forward to helpinng you achieve a level of performance that is likely not possible if you try to do everything on your own. With so much (mis)information out there, I can help you to navigate your way through all of the science, fads and hype so that you can focus on what you love to do - train and race. 

Proper sport and daily nutrition is not only vital to your athletic success but it's important to take care of yourself nutritionally in order to improve your overall health to reduce the risk for disease and illness and to improve quality of life. With my background in exercise science and exercise physiology, I really enjoy helping athletes understand how to use sport nutrition products properly to support the physiology of your body during high volume or intense training as well as on race day.

I do not provide nutrition consultations for intentional weight loss. I do not believe in “bad” foods, mass marketed meal plans or diet fads. The diet culture has misinformed athletes as to the best ways to eat and fuel to optimize performance. I am a performance-focused sport dietitian who offers safe, realistic and sustainable eating and fueling strategies to help you meet your athletic goals while keeping your body and mind in great health.

Don’t leave your daily and sport nutrition strategies to chance. I’ll help you take away the guessing so you can experience what its like to train and race with a well nourished and well fueled body.

Get started by selecting the service that would best fit your personal needs. 

CURRENT AVAILABILITY FOR A NUTRITION PACKAGE IS LIMITED. PLEASE EMAIL BEFORE PURCHASING.

I’d love to hear from you first and learn a bit more about you before we decide on the best service to meet your needs. Please do not purchase a service without inquiring about availability and to make sure we make a good fit.