Rachelle Simpson Sweet, Ph.D.

Who Am I and Why I Should Be Your Coach

I’m Dr. Rachelle Simpson Sweet, an Epigenetic Coach, writer, and founder of the B.E.S.T. Living™ coaching method. This precision-guided approach helps you transform your health by understanding the biology that makes you you.

Born in the UK and raised in the United States from age 13, I’ve lived and worked across several countries, giving me a global perspective on human behavior, wellness, and what it takes to truly thrive. My path to this work has been anything but linear, but every step prepared me to support clients with depth, compassion, and scientific clarity.

My Background & Training

I hold a Doctorate in Clinical Neuropsychology from Nova Southeastern University, with clinical training in neuropsychology and health psychology. My two-year postdoctoral fellowship at Evanston Northwestern in Pediatric Neuropsychology provided a deep understanding of how the brain and body shape each other across the lifespan.

While I am not a practicing neuropsychologist, this extensive training uniquely equips me to understand:

  • How behaviors form

  • How stress impacts physiology

  • How cognition and biology interact

  • Why people struggle to change and how to make change possible

My Shift into Epigenetics

In 2020, I expanded my work into the world of epigenetics and precision lifestyle design. I completed a comprehensive Genetic Training Program focused on interpreting DNA and applying those insights to real-life health strategies.

This work is where everything clicked:
Your body isn’t fighting you; it’s following instructions written in your genes and expressed through your environment.

Once you understand those instructions, transformation becomes much easier.

My Coaching Philosophy

My approach blends advanced science with compassionate coaching, integrating:

  • Epigenetics & genetic interpretation

  • Nutrition tailored to your biology

  • Metabolism & detox pathway optimization

  • Sleep and circadian alignment

  • Stress resilience & nervous system support

  • Environmental and lifestyle personalization

This is not a one-size-fits-all method.
It’s a boutique, personalized partnership based on your unique blueprint.

My Personal Journey

My work is not purely academic; it’s deeply personal.
I struggled with my weight and diet confusion from age 13, and I watched loved ones face illnesses that stemmed from lifestyle choices that were contra to their genetics. No matter what I tried, the “rules” around health never quite worked for me.

Studying psychology, neuropsychology, and genetics helped me understand why:
We are biologically individual, and no two bodies operate the same way.

This realization changed everything.
And it’s the foundation of the B.E.S.T. Living™ coaching program.

Author, Educator & Speaker

I am the principal author of Expressive Origins, a book exploring how our genetic blueprint influences who we become emotionally, cognitively, and physically. The themes of the book are woven into my coaching. because once you understand your origins, you can consciously shape your future.

I’ve also contributed to five published books, presented neuropsychology research at professional conferences, and hosted the B.E.S.T. Living™ Show podcast.

Your Journey Starts Here

If you’re ready to understand your biology, break free from patterns that weren’t your fault, and move into a life aligned with your design, I would be honored to guide you.

[Book a session with Dr. Rachelle here]

If you want to see some before and after photos of my journey

Click Here

“Rachelle coaches from a wealth of experiences that contribute to her thoughtful, understanding, and insightful reflections. Her easy and accepting manner makes it easy for me to admit areas I am struggling with and want to change, no matter how embarrassed I may feel. Rachelle’s non-judgmental nature helps me discover new ways to look at my challenges and encourages me to continue experimenting with new techniques with the faith that I am moving closer to becoming my best self each week.”

Natalie G.

“Rachelle is a skilled listener who challenges me to realize my dreams and to seize my strengths. She is empathetic, hearing my feelings and accepting me where I am at. Rachelle leaves me energized and confident in succeeding with my every day and long-term goals. I feel energized and confident by Rachell’s coaching.”


Colleen T.

DISCLAIMER: The information presented is not intended for the treatment or prevention of disease, nor a substitute for medical treatment, nor as an alternative to medical advice. It is presented for information purposes. Use of the information provided is at the sole choice and risk of the reader. You must get your physician’s approval before beginning any diet or exercise program.