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Meet the Dietitians

The Core Diet for athletes was developed by coach, founder and author of the endurance training diet & cookbook, Jesse Kropelnicki.

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Founder of the Core Diet, Ironman Triathlete, and Elite Level Triathlon Coach

Jesse is an elite/pro level triathlon coach who founded the QT2 Systems brand of endurance preparation businesses, including OutRival Racing, The Core Diet, The Run Formula, and QT2 Systems. He is the triathlon coach for many professional athletes including TJ Tollakson, Linsey Corbin, Angela Naeth and Pedro Gomes, among others. His interests are in coaching professional triathletes using quantitative training and nutrition protocols. He is a USAT Level III Certified Coach and author of the book “The Endurance Training Diet & Cookbook: The How, When, and What for Fueling Runners and Triathletes to Improve Performance”.

Ironman Triathlete and Future Registered Dietitian

Chrissie received her Bachelor's degree in Cardiopulmonary Science from Northeastern University and is currently working on her Master's degree in Nutrition at Simmons College. She works as a Cardiovascular Technologist at Beth Israel Medical Center and is a USAT certified triathlon coach. After beginning her athletic career as a runner, she further challeged herself by competing in triathlons. Chrissie has since finished many triathlons including the Ironman distance. Through competing in these events, Chrissie realized just how important nutrition is for competitive athletes, as well as day to day nutrition for recreational athletes.

Registered Dietitian

Leslie is a Registered Dietitian and lifelong athlete, competing in a variety of sports throughout her life. She received a Bachelor’s degree in Public Health Studies from Johns Hopkins University and a Master of Science in Human Nutrition from Drexel University. She completed her dietetic internship through the University of Maryland, College Park where she completed rotations in a variety of settings including an adult inpatient hospital, collegiate campus dining services, University of Maryland Football, the Maryland Terp Farm, and more. During her time at Drexel University, Leslie had the opportunity to work as a sports nutrition intern for the Center for Nutrition and Performance, which provided nutrition support and education for Drexel’s Division I student-athletes and two professional sports teams, the Philadelphia Flyers and Philadelphia Union. With this group, Leslie also had the unique experience of working for the USA Team at the 2019 World University Games in Naples, Italy.

Triathlete and Registered Dietitian

Kylie is a registered dietitian and lifelong athlete who loves incorporating her two passions, nutrition and movement, to help people achieve their goals. She received her Bachelor of Science in Biology and Predictive Health from Emory University, and her Master of Science in Human Nutrition from Drexel University. She completed her dietetic internship through the University of Houston where she worked in a variety of settings including adult and pediatric hospitals, the Ironman Sports Medicine Institute, and the Center for Discovery for eating disorders. Kylie is currently a clinical dietitian at Jefferson University Hospital in Philadelphia, PA. As a sports dietitian, her mission is to optimize performance and overall health for her athletes. Kylie’s passion for nutrition started as an athlete and has continued to evolve as a coach. As a collegiate swimmer, Kylie earned six All-American honors and four NCAA DIII National Championship team titles at Emory University. Kylie coached age group swimming, NCAA Division I swimming, and worked for the USA Team at the 2017 World University Games in Taiwan. She was a sports nutrition intern for Drexel University’s Center for Nutrition and Performance, which provided nutrition support and education for 450 Division I student-athletes and two professional sports teams, the Philadelphia Flyers and Union. Kylie has also worked as a personal trainer, group exercise instructor, and CrossFit Level 1 coach in Greater Philadelphia. Kylie enjoys traveling and competing as a multi-sport athlete: she’s completed numerous open water swims, half marathons, one marathon, and a number of triathlons at the 70.3 distance including the 2018 Ironman 70.3 World Championships in South Africa.  

IRONMAN Triathlete and Registered Dietitian

Registered Dietitian Name:Beth Peterson


Hometown:North Easton, MA

Where Beth Grew Up:Pittsburgh, PA

Education:BS Nutritional Sciences from Penn State University; currently working towards an MS in Nutritional Sciences from Arizona State University

Dietitian Experience:Beth has now been a registered dietitian for over 20 years, and in many different capacities - clinically, in wellness, and with athletes. Although the focuses are a bit different each time, the goal is the same - to help people live, feel, and perform better through solid nutrition and fueling.

Athletic Highlights:Beth grew up as a runner and competed in cross country and track throughout high school, and then for Penn State. After college, like most injured runners, Beth turned to triathlon, expecting to do one or two sprints for fun, and then get back to running full time. More than 15 years later, seven of which were spent racing professionally, Beth still at the triathlon thing. She had taken time away from IRONMAN to do ultra run races (those are hard), mountain bike racing, and even some off-road triathlons. Ultimately IRONMAN lured Beth back in. Now as an older, slower age grouper, Beth still enjoys the grind of the training and lifestyle.

Hobbies:Eating pizza? Swim/bike/run takes enough time...

Why work with The Core Diet:Beth's first experience with the Core Diet was as an athlete. The approach to race fueling made SUCH a big difference for her, that she jumped at the opportunity to be on the other end of the nutrition education, when it was offered. The attention to detail and the science-based approach to fueling is really second to none.

Favorite Quote:“Courage, dear heart.”

                                        - C.S. Lewis 

Triathlete, Marathoner, Registered Dietitian, Youth Junior Qualified

Anne received her Master of Science, Nutrition and Dietetics from NYU, is a board Certified Specialist in Sports Dietetics, Registered Dietitian and Licensed Dietitian and Nutritionist in the state of Massachusetts, a USAT certified Level 1 Coach and certified trainer. She began her ventures into the wellness arena in the early 90’s working in gyms as a trainer and group instructor while pursuing an acting career in New York City. 


Always a runner, she volunteered for the New York Road Runners Foundation as a running coach serving public schools throughout the 5 boroughs providing after school running programs. Noticing the nutrition, or lack thereof, with her students, she designed a nutrition program and began writing nutrition articles for the Foundation. Intrigued by the field, she enrolled as a dietetics student at NYU and soon partnered NYU students and the Foundation, delivering a unique and interactive workshop regarding nutrition for ages 8-15. 


After graduation and relocating to the Boston area, Rollins was introduced to a local triathlon training group, QT2 Systems, looking for dietitians to help support their athletes via the sister company, The Core Diet. As a long time runner and endurance athlete, the fit was natural. Anne additionally worked clinically with the critically ill and dialysis patients before finding herself as the campus dietitian for Perkins School for the Blind where she provided individual counseling and menu design for students age 3-22.  

Last year, Rollins promoted proper nutrition while coaching her LUSC boys 11 soccer team and to several Pop Warner football teams. She is currently working with her local football league to develop an off-season plan for the players.  

Anne runs a wellness center outside Boston that embraces balanced fitness and recovery for people of all ages and abilities. She is a proud mom of two invigorating children who joined her in their very successful, first triathlon this year. She has competed at the half Ironman distance for four seasons and is excited to race her first full Ironman this year. Anne is still an active Screen Actors Guild member.


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What Our Nutrition Clients Say?

I remember laughing when Jesse told me I should weigh 168 pounds in order to perform at my triathlon potential. "Should" and "could" were two very different things in my book. But wouldn't you know that in a 3 month period under Jesse's direction I dropped from 188 pounds to 168, and then raced triathlons during the 2006 season in the mid 160s. The results of the weight loss were immediately evident in my performance at Half Ironman where I logged over a 10 minute improvement from the prior year.

Drew Bennett, Ironman TriathleteLost 20lbs in 12 weeks.

"I lost 18 pounds over 15 weeks in preparation for the NYC marathon last year. I couldn't have done it without the Core Diet"

Trish Kelly, Boston MALost 18 pounds over 15 weeks.