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Dr. Nessan Costello

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Turning Nutrition Science Into Performance

Practical, evidence-based nutrition support trusted by world-class athletes, leading artists, and high performers – so you can focus on what you do best: performing.

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Clients Transformed
99 +
Peer-reviewed Publications
2 +
Championships Coached
1

How We Get You to Peak Performance

Let’s Make Nutrition Simple, 
Practical and Personal.

Our approach replaces confusion with clarity and confidence, making nutrition easy to enhance your career and life.

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Clarity

We use evidence-based profiling to identify your key gaps and performance levers. No guesswork, just data.

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Confidence

We turn complex science into easy, actionable behaviours – so you understand the ‘why’ behind what you eat.

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Performance

You feel better, think clearer, and perform at your absolute best, turning nutrition into a source of empowerment.

Ready to find your personal performance lever? Try my Free Performance Nutrition Profiler

Only takes less than 2 minutes*

Results That Speak Louder Than Theory

Why trust the science? Because it works at the highest level.

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Meet Dr. Nessan

SENr-accredited sports nutritionist and academic.

I turn complex science into practical, actionable performance.

For the last decade, I’ve supported athletes and teams across elite sport—including Chelsea FC, Leeds United, and Newcastle United—and advised leading artists, performers, and business professionals. Holding a PhD in Sport Nutrition and authoring over 25 peer-reviewed publications, I bridge the gap between rigorous research and real-world results.

The goal is simple: To give you the clarity and confidence to apply evidence that makes a real difference to your health, energy, and performance—so you can focus on what you do best.

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Your Path to Mastery

Here is how you can access the same elite-level strategies trusted by top performers.

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Immediate Impact

Ebooks & Playbooks

Unlock game-changing, evidence-based blueprints designed for specific performance goals. Instant downloads.

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Are You Fuelling Like an Elite Athlete?

Take our FREE 2-minute profiler to discover how elite your performance nutrition is.

Only takes less than 2 minutes*

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Personalised Support

For the serious performer with little time to overthink. Apply for 1:1 coaching tailored to your demanding schedule and ambitious goals.

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Free Insights

Blog and Articles

Dive into the evidence that drives elite performance. Access my academic publications and bite-sized, digestible blog posts.