Protein Tracker vs WWF Methodology: Which Approach Should Retailers Use to Measure the Protein Shift?

Introduction

Supermarkets are starting to set targets for plant-based sales, Scope 3 emissions, healthier diets, and lower-impact food baskets. The harder question comes next: how should they measure progress?

Across Europe, two approaches are becoming particularly relevant: the Protein Tracker, developed by the Green Protein Alliance and ProVeg Netherlands, and WWF's Planet-Based Diets Retailer Methodology.

Both are credible. Both help retailers understand the balance between animal-based and plant-based foods. But they are designed for different purposes. The choice of methodology affects baselines, targets, reporting, governance, category decisions, supplier conversations, and public communication.

The question is not which methodology is "right." It is which method is most useful for the decision a retailer needs to make.

Why Methodology Comes First

When a retailer says it wants to "track the protein shift," it can mean several things.

It can mean measuring the share of total protein sold that comes from plant-based versus animal-based sources. It can mean tracking sales of protein-source foods such as meat, fish, eggs, legumes, nuts, and plant-based alternatives. It can also mean measuring a broader shift across the full food basket.

These ideas are connected, but they are not the same.

A retailer could increase plant-based sales while animal-protein sales also continue to grow. In that case, the plant-based category may be performing well, but substitution may not be happening. Another retailer could improve its overall food basket by selling more legumes, grains, and vegetables, even if its plant-based meat alternatives category remains small.

Both changes can matter. They just measure different things.

This is why the methodology should be chosen before a target is announced. A target is only useful if the baseline, scope, and calculation method are clear. Otherwise, two retailers can both say they are tracking the protein transition while measuring different realities.

For supermarkets, methodology is not a technical footnote. It defines what the strategy is actually tracking.

The Two Main Approaches

1. The Protein Tracker

The Protein Tracker was developed in the Netherlands by the Green Protein Alliance and ProVeg Netherlands, in collaboration with Dutch supermarkets and expert organisations including Natuur & Milieu and Questionmark Foundation. It has become a reference methodology for retailers that want to measure the split between plant-based and animal-based protein sales.

The core principle is straightforward: the Protein Tracker measures the volume of protein sold.

In practice, this combines three inputs:

- product sales volumes;

- product weight or volume;

- protein content.

The result is a calculation of how many kilograms of protein were sold, and what share of that protein came from plant-based or animal-based sources.

This makes the Protein Tracker useful when a retailer wants a clear operational KPI. It answers a specific question: of all the protein sold by a retailer, what share comes from plant-based sources and what share comes from animal-based sources?

That makes it suitable for year-on-year tracking, category-level action plans, internal performance management, and external reporting.

The Dutch market shows how this can work in practice. In 2025, the latest Protein Tracker assessment covered 95% of the Dutch retail market, with 13 participating retailers. The assessment found that Dutch supermarket protein sales were 42.6% plant-based and 57.4% animal-based. Dutch supermarkets have also committed to reaching at least 60% plant-based protein sales by 2030.

For retailers, this type of metric is useful because it can be connected to commercial decisions. If a retailer changes promotions, shelf placement, assortment, or e-commerce recommendations, a protein-weighted metric can help answer a practical question: did this intervention shift the protein ratio, or did it only increase plant-based sales while animal-protein sales remained stable or grew?

That distinction matters. Selling more plant-based products is not automatically the same as reducing animal-protein sales. If plant-based growth is mostly incremental, the environmental and strategic effect may be limited. A protein-weighted metric helps retailers see whether substitution is actually happening.

2. WWF's Planet-Based Diets Retailer Methodology

WWF's methodology starts from a broader sustainable diets perspective.

In 2024, WWF launched its Planet-Based Diets Retailer Methodology to help retailers measure, report, and rebalance sales of animal-source and plant-based foods. WWF links this work to climate, nature, and health goals.

This means WWF's methodology is not only about grams or kilograms of protein. It is also about how the retailer's overall food offer is moving toward healthier and more sustainable dietary patterns.

WWF recommends that retailers set targets to reach a 60:40 split in favour of plant-based foods within protein sources. It also recommends a broader 70:30 plant-to-animal split across all food groups by 2050.

This wider food-basket view includes categories such as meat, poultry, eggs, seafood, legumes, nuts, seeds, dairy, dairy alternatives, and plant-based alternatives. WWF's supporting food-list documents also show how detailed the classification work can become, with practical decisions around products such as houmous, peas, broad beans, sandwiches, pizzas, and other composite foods.

This makes WWF's approach especially useful for ESG and CSR teams. It helps answer a broader question: how is the retailer's food basket shifting toward healthier and more sustainable diets?

That framing can be useful for external communication. It connects the protein shift to climate, biodiversity, and public-health objectives, rather than treating it as a standalone plant-based sales metric. For retailers that already work with WWF frameworks, or that want to report through a sustainable diets lens, this can be a real advantage.

The Core Difference

The Protein Tracker is more protein-weighted and operational. WWF's methodology is broader and more diet-oriented.

The Protein Tracker is built around direct measurement of plant-based versus animal-based protein sold. It is well suited to retailers that want a clear KPI, a baseline, and a repeatable way to track progress over time.

WWF's methodology is built around a broader sustainable diets framework. It is well suited to retailers that want to connect protein-source foods to climate, nature, health, and wider food-basket reporting.

Different teams will value different aspects. A data or category management team may prefer the Protein Tracker because it creates a direct link between product sales and protein-ratio movement. An ESG or corporate affairs team may prefer WWF's approach because it fits more naturally into sustainability reporting and external commitments.

Both needs are legitimate. But retailers should not treat the two approaches as interchangeable.

Switching from one method to another without explanation can break comparability. A retailer that calculates its baseline using one methodology and then reports progress using another may create confusion internally and externally. This is especially important if the metric is used in public commitments, investor communication, or supplier negotiations.

The main principle is consistency: choose a method, document the assumptions, and use it repeatedly.

Where the Protein Tracker Works Best

The Protein Tracker is strongest when a retailer wants a clear operational KPI.

Its first advantage is precision. Because it focuses on kilograms of protein sold, it directly addresses the core measurement question: are sales moving from animal-based protein toward plant-based protein?

Its second advantage is usability. A protein-weighted metric can be translated into category-level action. If the ratio is weak in ready meals, fresh meat, dairy, frozen foods, or food-to-go, the retailer can identify where the largest opportunities sit.

Its third advantage is comparability. The Dutch experience shows that a common methodology can help create sector-wide momentum. When several retailers use the same approach, the market can move from isolated initiatives to shared measurement.

The Protein Tracker is also well suited to commercial testing. A retailer can test a promotion, shelf change, e-commerce intervention, or assortment decision, then assess whether the protein ratio changed. This matters because many sustainability metrics remain disconnected from commercial decision-making. A protein-weighted ratio can help connect the two.

The Protein Tracker also has limits.

It depends heavily on data quality. Retailers need reliable sales volumes, product information, and protein content. Composite products can be difficult to classify. A chicken-and-lentil salad, cheese-and-vegetable quiche, beef lasagne, or plant-based product containing egg or milk protein all require clear rules.

There is also a risk of interpreting the metric too mechanically. If any product with added plant protein is treated as progress, even when it is not nutritionally meaningful or strategically relevant, the metric can become distorted. This is why categorisation rules and quality control matter. The Protein Tracker is useful, but only if it is applied carefully.

Where WWF's Methodology Works Best

WWF's methodology is strongest when a retailer wants to embed the protein shift inside a broader sustainable diets strategy.

Its first advantage is strategic breadth. It connects protein-source foods to climate, nature, and health goals. That can help ESG teams explain why protein shift matters beyond a single KPI.

Its second advantage is food-basket thinking. Retailers do not only sell meat alternatives, tofu, or legumes. They sell breakfast, lunch, dinner, snacks, prepared meals, dairy, frozen foods, fresh produce, and grocery staples. WWF's approach places protein diversification within that larger system.

Its third advantage is stakeholder communication. A broader sustainable diets framework can be easier to explain to external audiences, especially when linked to recognised concepts such as the Planetary Health Diet.

WWF's approach also has limits.

Because it is broader, it can be harder to translate into one simple operational KPI. It may work well for ESG reporting and sustainable diet strategy, but it can be less immediately actionable for category managers who need to know which levers will move a protein ratio in a specific department.

It also does not remove the implementation challenge. Retailers still need to classify thousands of products consistently. Prepared meals, mixed products, private-label recipes, national-brand products, and incomplete product data remain difficult regardless of the methodology selected. The framework may be credible, but retailers still need the operational capacity to apply it well.

The Main Implementation Challenge: Product Categorisation

In practice, the main barrier is often not the formula. It is product categorisation.

A retailer may already have sales data. It may know how many units of each product were sold over the last 12 months. But to calculate a credible protein ratio, those products must be classified correctly.

That requires detailed decisions. Is the product animal-based, plant-based, or mixed? Does it belong in a protein-source category? How should a prepared meal be handled? What if the product contains both meat and legumes? What if a vegetarian product contains dairy protein? What if nutrition data is missing?

These questions decide the result.

This is where many retailers underestimate the work required. The calculation can look simple on paper. Applying it to thousands of SKUs is a different task.

A credible methodology needs more than a formula. It needs:

- clear classification rules;

- a process for edge cases;

- quality control;

- documentation of assumptions;

- a repeatable annual workflow.

The first calculation does not need to be perfect. It does need to be transparent, repeatable, and improvable. A practical approach is to create a first baseline, then improve data quality each year.

How Retailers Should Choose

A retailer should choose the Protein Tracker if its main priority is to build a clear operational protein KPI. This is likely the right choice when the retailer wants to measure the plant/animal protein split directly, compare progress year after year, and give category teams a metric they can act on.

It is also useful when the retailer wants to test whether interventions are shifting sales from animal-based to plant-based proteins.

A retailer should choose WWF's methodology if its main priority is broader sustainable diets reporting. This is likely the right choice when the retailer wants to connect protein-source foods to climate, nature, health, and food-basket commitments. It may also be the right choice for retailers that already use WWF-style reporting internationally.

Some retailers may choose a hybrid approach. This can make sense, but only if it is documented clearly.

For example, a retailer could use a Protein Tracker-style metric as the internal operational KPI, while using WWF's framework to place the work within a broader sustainable diets strategy. Category teams would work with a precise protein ratio. ESG teams would explain the wider environmental and health relevance.

But a hybrid approach should not become a vague compromise. It must specify which metric is used for which purpose, which data is included, how composite products are treated, and how year-on-year comparability will be protected.

Recommendation for French Retailers

For French supermarkets, the priority should be to avoid spending months debating methodology before creating a baseline.

France is still at an earlier stage than markets such as the Netherlands, the UK, or Germany. The urgent need is not a perfect public commitment. It is a credible first measurement.

For many French retailers, the most pragmatic route is to start with a protein-weighted operational baseline, close to the Protein Tracker logic, while using WWF's broader methodology as a strategic reference for sustainable diets.

This approach has three advantages.

First, it gives retailers a clear number: the share of protein sales coming from plant-based and animal-based sources. Second, it keeps the metric close to commercial reality: sales volumes, product data, categories, and interventions. Third, it allows ESG teams to connect the work to climate, biodiversity, and health objectives.

The right answer may vary by retailer. A company already using WWF internationally may prefer to maintain consistency across markets. A retailer starting from scratch may prefer the operational clarity of a protein-weighted ratio. A retailer with limited data maturity may need a first approximate baseline before moving to a more precise product-level calculation.

Waiting for a perfect methodology is the wrong tradeoff. A credible first version, transparently documented, is better than no baseline.

From Measurement to Commercial Action

The purpose of measuring the protein ratio is not simply to publish a number. Measurement should help retailers decide what to do next.

Once a baseline exists, teams can identify which categories matter most. They can test whether plant-based products perform better when placed next to animal equivalents. They can assess whether promotions increase substitution or only add incremental sales. They can evaluate whether e-commerce recommendations change baskets. They can understand whether pricing gaps are blocking adoption.

This is where the protein ratio becomes valuable for business teams. For ESG teams, it creates a credible way to track progress. For category teams, it turns sustainability into a commercial question. For data teams, it creates a measurable baseline. For leadership, it shows whether commitments are translating into actual sales movement.

The best methodology is not the one that looks strongest in a report. It is the one that helps the retailer make better decisions.

Do Not Create a Third Methodology

The Protein Tracker and WWF's methodology are both serious, usable approaches to tracking a retailer's progress toward healthier and more sustainable diets. Retailers should be careful about creating a third methodology unless there is a strong reason to do so.

A custom approach can create more problems than it solves. It may reduce comparability, increase internal debate, and make external communication harder. In most cases, the better route is to use one of the existing methodologies, document any adaptations clearly, and apply it consistently.

Conclusion

The Protein Tracker and WWF's methodology are both useful tools for the European protein transition.

The Protein Tracker is best understood as a precise, protein-weighted operational metric. It is particularly useful for retailers that want to measure the plant/animal protein split directly and translate it into category-level action.

WWF's methodology is best understood as a broader sustainable diets framework. It is particularly useful for retailers that want to connect protein-source food sales to climate, nature, health, and total food-basket objectives.

For retailers, the key is to choose the method that can be implemented consistently, explained clearly, and used every year.

Reporting alone will not deliver the protein shift. Retailers need to measure where they are, understand what is driving the ratio, test commercial interventions, and improve the metric over time.

The next step is to build a credible baseline and use it to guide decisions.

Sources

Green Protein Alliance & ProVeg Netherlands, The Protein Tracker methodology update https://theproteintracker.com/wp-content/uploads/2026/01/2025_The-Protein-Tracker-Update-Oct-2025-Green-Protein-Alliance-Proveg.pdf

ProVeg International, Dutch supermarkets lead Europe, but must collaborate to reach 2030 plant-protein targets https://proveg.org/press-release/dutch-supermarkets-lead-europe-but-must-collaborate-to-reach-2030-plant-protein-targets/

WWF, WWF launches new methodology to support retailers in achieving 60% of protein food sales from plant-based sources https://www.wwfcee.org/news/wwf-launches-new-methodology-to-support-retailers-in-achieving-60-of-protein-food-sales-from-plant-based-sources

WWF UK, WWF Basket Diets Metric Food List https://www.wwf.org.uk/sites/default/files/2025-03/WWF-Basket-Diets-Metric-Food-List.pdf

WWF UK, WWF Basket Diets Metric Guide https://www.wwf.org.uk/sites/default/files/2024-12/diets-metric-guide.pdf