About Me

Fueling Athletes to Their Best Times

My name is Casey Katz and I'm a Registered Dietitian, an ISSA Certified Running Coach, and endurance athlete. I started Grit & Grow because I know firsthand that how you fuel is just as important as how you train.

Since becoming a dietitian in 2011, I've built my practice around one belief: nutrition isn't generic, and athletes deserve a fueling strategy built for the way they train and race.

On the Course, Not Just in the Clinic

I don't just study performance nutrition — I live it. My race resume includes:

• 2 Ironman finishes

• Multiple 70.3 finishes

• 50+ half marathons

• Ultramarathons

• Ragnar Relays

• 5K PR: 21:04

• Marathon PR: 3:34

Every long run, every race-day bonk I've learned from, every fueling strategy I've tested on myself — it all shapes the way I coach. I know what it feels like to hit the wall at mile 20, and I know what it takes to fix it. And if you’ve ever gone on a long run with me, you’ve experienced first-hand the planning tactics I implement to make that run a success… including the pitstop into a random bush to obtain the sports drinks I dropped earlier that morning.

My Approach

Grit and Grow exists to help athletes stop guessing about nutrition and start fueling with a plan. Whether you're training for your first half marathon or chasing a Boston Qualifier, I'll help you build a fueling strategy that supports your training, speeds up recovery, and gets you to the finish line stronger.

As an ISSA Certified Running Coach and a Registered Dietitian, I can build you a custom training plan, a nutrition fueling plan, or both — whatever fits where you're at. Already working with a coach you love? No problem. I can plug in as your nutrition support alongside your existing training plan.

Ready to fuel smarter? Contact me in the form below