​

Welcome to Issue 10 of the Nutrition Authority Newsletter.

A sports nutrition practitioner working with a physique athlete notices something frustrating.

Progress has stalled.

The athlete is:

• tracking accurately
• training consistently
• following the plan closely

Small adjustments are made:

• slight calorie reductions
• minor macro refinements
• subtle changes to meal timing

But nothing meaningfully changes.

Situations like this are common in applied sports nutrition.

And they highlight an important reality:

Not all interventions carry equal impact.

---

Applied Case Scenario

A practitioner supporting a team sport athlete is trying to improve match-day performance.

The athlete reports:

• fatigue late in games
• inconsistent energy levels
• variable recovery between sessions

The practitioner initially considers:

• increasing carbohydrate intake
• adjusting pre-match fuelling
• modifying hydration strategy

All reasonable interventions.

But after reviewing the broader context, a different picture emerges.

Sleep duration had dropped significantly due to lifestyle factors.

Recovery capacity was compromised.

The most impactful intervention was not nutritional.

It was improving sleep opportunity.

Performance improved rapidly.

This is the difference between low-leverage adjustments and high-leverage interventions.

---

The leverage problem in sports nutrition

Many practitioners spend time optimising variables that are not limiting performance.

This often looks like:

• refining already adequate macronutrient targets
• adjusting meal timing without a clear constraint
• adding supplements without addressing underlying issues

These changes can be evidence-based.

But if they do not target the primary constraint, their impact is minimal.

---

High-leverage interventions target the primary constraint.
Low-leverage interventions optimise non-limiting variables.

---

What makes an intervention high-leverage

A high-leverage intervention:

• targets the most limiting factor in the system
• produces disproportionate improvement relative to effort
• simplifies rather than complicates the plan
• aligns with the athlete’s current capacity

Low-leverage interventions often do the opposite.

They:

• add complexity
• create marginal gains
• increase cognitive load
• distract from the real issue

---

Mechanism Spotlight — Issue 10

Mechanism: Intervention Dilution

---

What this mechanism actually is

Intervention dilution occurs when multiple small or low-impact changes are introduced without addressing the primary constraint.

As a result:

• no single change has sufficient impact
• outcomes become difficult to interpret
• progress appears inconsistent

The system is being adjusted, but not meaningfully influenced.

---

How it appears in practice

Practitioners may:

• adjust calories, macros, and supplements simultaneously
• introduce multiple behavioural targets at once
• layer complexity onto an already adequate plan

Despite effort, results remain modest.

---

Common practitioner mistake

Confusing activity with effectiveness.

More changes do not equal better outcomes.

---

What changes when leverage is identified

When the correct constraint is targeted:

• fewer interventions are needed
• clarity improves
• adherence stabilises
• progress accelerates

Often, one well-selected change outperforms multiple smaller ones.

---

Key takeaway

Impact is determined by relevance, not quantity.

---

Science → Practice

Research in complex systems and performance science shows that outcomes are disproportionately influenced by key limiting factors.

In practice, this means:

Small improvements in the wrong variable produce minimal change.

Targeted improvements in the right variable produce meaningful results.

Science helps us identify potential mechanisms.

Practice determines which one matters most.

---

Your challenge this week

Review one current client or athlete case.

Ask yourself:

• What is the primary constraint?
• Which intervention would most directly influence it?
• What could I remove rather than add?

Clarity often comes from narrowing focus.

---

A principle worth keeping

Better outcomes come from better targeting, not more effort.

---

Coming next — Issue 11

In Issue 11, we will explore how practitioners develop consistency in their decision-making across different athletes and contexts.

---

To better practice,
​Dr Laurent Bannock