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Welcome to Issue 11 of the Nutrition Authority Newsletter.

A sports nutrition practitioner working with a team sport athlete encounters a frustrating situation.

The nutrition plan is ‘well-designed’ (yes, assuming the practitioner is ‘properly’ qualified etc):

• Energy intake is appropriate
• Macronutrients are aligned with demands
• Hydration strategy is in place

The athlete is engaged and generally adherent.

Yet performance and recovery remain inconsistent.

Situations like this are common in applied sports nutrition.

And they raise an important question:

Why do some athletes fail to respond to ‘good’ nutrition plans?

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Applied Case Scenario

A practitioner supporting multiple athletes across a competitive season notices a pattern.

Several athletes present with similar issues:

• fatigue during high training loads
• inconsistent recovery between sessions
• fluctuating performance

The practitioner responds appropriately in each case:

• adjusting carbohydrate intake
• refining meal timing
• modifying fuelling strategies

Each decision is evidence-based.

But outcomes remain inconsistent across athletes.

On closer reflection, the issue becomes clearer.

The problem is not (usually) the nutrition knowledge.

It is how decisions are being made across cases.

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The hidden problem in applied sports nutrition

Most practitioners are trained to:

• design nutrition plans
• apply evidence-based strategies
• optimise intake and timing

But fewer are trained to apply these decisions consistently across different contexts.

This leads to:

• variability in decision-making
• inconsistent prioritisation
• fluctuating outcomes

The issue is not what the practitioner knows.

It is how reliably they apply that knowledge.

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Consistent decision-making produces consistent outcomes.
Inconsistent reasoning produces variable results, even with strong nutrition knowledge.

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Why ‘good’ plans don’t always work

A nutrition plan can be:

• scientifically sound
• appropriately designed
• well implemented

But still underperform if it does not target the primary constraint.

Two athletes may present with similar symptoms.

But the underlying limitation may differ:

• one may be limited by recovery capacity
• another by cognitive load
• another by training structure

If the same solution is applied inconsistently or without a clear framework, results will vary.

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Mechanism Spotlight — Issue 11

Mechanism: Decision Variability in Practice

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What this mechanism actually is

Decision variability refers to inconsistency in how practitioners interpret and respond to similar situations.

Even when problems appear similar, decisions may differ based on:

• recent experience
• perceived urgency
• cognitive bias
• incomplete context

This creates variability in outcomes.

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How it appears in practice

Practitioners may:

• prioritise different variables in similar cases
• adjust different aspects of nutrition without clear reasoning
• shift between strategies without consistency

Often, this is subtle and unintentional.

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Common practitioner mistake

Assuming inconsistent outcomes are due to athlete differences alone.

In many cases, they reflect differences in decision-making.

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What changes when consistency improves

When practitioners apply a consistent framework:

• decisions become more repeatable
• reasoning becomes clearer
• interventions become more targeted
• outcomes stabilise

Consistency does not remove nuance.

It provides structure within complexity.

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Key takeaway

Consistent thinking produces consistent results.

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Science → Practice

Research in expert performance shows that high-level practitioners rely on structured decision processes rather than reactive adjustments.

In practice, this means:

Better outcomes are not just about better nutrition plans.

They are about better and more consistent decisions.

Science informs your options.

Frameworks guide your execution.

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Applied Practice Takeaways

• When outcomes vary, review your decision process before changing the plan
• When two athletes present similarly, confirm the underlying constraint before applying the same intervention
• When progress stalls, ask what is limiting performance rather than what needs adjusting
• When unsure, simplify and focus on one meaningful change

Practical nutrition work improves when decision-making becomes structured and repeatable.

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Your challenge this week

Review two recent athlete or client cases.

Ask yourself:

• Did I approach these situations in the same way?
• What guided my decisions?
• Where did my reasoning differ?

Improvement often begins with recognising inconsistency.

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A principle worth keeping

A good plan applied inconsistently will produce inconsistent results.

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Coming next — Issue 12

In Issue 12, we will explore why experienced practitioners often choose to do less, not more — and how restraint becomes a performance advantage.

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To better practice,
​Dr Laurent Bannock