I've spent years figuring out what your doctor never told you.
Now I tell my clients.
I'm Kelli O'Brien — a Licensed Dietitian and Certified Nutrition Specialist specializing in fertility nutrition. I help women identify and address the root causes of ovulation problems so they can stop guessing and start making real progress.
I wasn't always the person with the answers.
By my early twenties I had lost my period. I had PCOS — but looking back, the diagnosis only told part of the story. The rest of it was me: restricting food, minimizing carbs, pushing through workouts on no energy, and drinking enough on weekends to undo whatever I'd managed to hold together during the week. I had been on birth control for years, so I hadn't noticed how dysregulated my cycle actually was until it disappeared.
At the time I thought I was being "healthy." I was doing what I'd been told to do — eating less, exercising more, avoiding the foods I'd been taught were bad. What I didn't understand was that I was systematically dismantling the hormonal environment my body needed to function.
"I thought I was doing everything right. The problem was that 'right' was based on advice that had nothing to do with how hormones actually work."
It took years of training, clinical work, and eventually my own fertility journey to understand what was actually going on — and what it actually takes to fix it. That understanding is the foundation of everything I do with clients today.
I've been through this twice.
Both times changed how I practice.
Most practitioners have one story. I have two — and they're separated by fifteen years of clinical training and a lot of humility.
I was restricting food, minimizing carbs, doing as much cardio as I could manage, and drinking heavily on weekends without connecting any of it to my cycle. When my period disappeared, I had no framework for understanding why. It took years of learning — and unlearning — to piece it together. The shift came when I stopped trying to eat as little as possible and started actually nourishing my body. My cycle came back. My anxiety improved. I stopped feeling out of control around food.
I was a Licensed Dietitian specializing in fertility. I thought I was doing everything right. What I discovered: I had low progesterone, inconsistent ovulation, and a weak luteal phase — all confirmed by labs. I made two targeted changes: reduced caffeine and added a myoinositol and D-chiro inositol blend. The next cycle, my progesterone went from 5 to 15 ng/mL. I got pregnant. My second child is here because I stopped assuming I had it figured out and looked at my actual data.
These aren't just personal stories — they're the reason I approach every client the way I do. I know what it's like to feel like you're doing everything right and still not getting answers. And I know what it's like when the right targeted intervention actually works.
What makes this different from
everything else you've tried.
Before founding my practice, I worked as a nutritionist for WIC and Nutrisense — experiences that gave me deep grounding in both prenatal nutrition and the power of real-time metabolic data. I've seen what happens when women get generic advice versus targeted, data-informed guidance. The difference is significant.
Here's how I work differently:
I start with your data, not a template
Your labs, your cycle history, your blood sugar patterns, your lifestyle — these tell me things a generic fertility diet never could. We build your protocol from what's actually happening in your body, not what works on average.
I focus on the systems that actually drive ovulation
Blood sugar regulation, cortisol balance, and progesterone support — these three systems govern whether and how well you ovulate. Most fertility advice skips over them entirely. I don't.
I tell you what to stop, not just what to start
Intermittent fasting, cutting carbs, 5am workouts on no sleep — many of the things women do in the name of "fertility health" are actively suppressing ovulation. Identifying and removing these is often the fastest lever we have.
I work with your real life
You have a job, a relationship, a schedule, and a history with food that matters. I'm not here to give you a protocol you can't sustain. Everything we build is designed to work in actual daily life — not a controlled experiment.
I've been through it myself
Not as a metaphor — literally. I have PCOS. I've experienced ovulatory dysfunction and pregnancy loss. I've made the changes that worked and the ones that didn't. That context shapes every recommendation I give.
Outside the practice.
I'm based in Wilmington, DE, where I live with my husband and two kids. When I'm not working, I'd rather be moving, baking something with actual ingredients, or doing pretty much anything that doesn't involve a screen.
I believe that the best nutrition advice is the kind you can actually follow — which means it has to fit your life, not the other way around. That's true for my clients and it's true for me.
Prioritizes movement over perfection
Bakes healthy treats that actually taste good
Wilmington, DE — in-person & virtual nationwide
Genuinely nerds out on labs and cycle data
Ready to work with someone who actually gets it?
Get the free private podcast — or learn more about how we can work together.