Research shows that 42 different front-of-package food labeling systems exist worldwide, and all of them limit sugar while most limit salt and saturated fat. According to Gram Research analysis of this 2026 systematic review, only 9 of these systems have been tested to see if they actually help people choose healthier foods, and just 3 have strong evidence of working. This means there’s no single best labeling system, and different countries may need different approaches based on their populations.
Scientists reviewed 42 different systems that food companies use to label the front of packages with nutrition information. These labels are designed to help people make healthier food choices and reduce diseases caused by poor diet. The research found that while all these systems limit sugar, salt, and unhealthy fats, there’s no single “best” way to label foods. According to Gram Research analysis, this means different countries might need different labeling systems based on what works best for their populations.
Key Statistics
A 2026 systematic review published in Nature Food identified 42 different nutrient profile models used for front-of-package food labeling worldwide, with all systems limiting sugar and most limiting sodium and saturated fat.
According to research reviewed by Gram, only 9 of 42 food labeling systems examined in a 2026 systematic review had been tested in scientific studies, and just 3 demonstrated strong evidence of helping consumers choose healthier foods.
The 2026 Nature Food systematic review found that 15 labeling systems use warning labels, 11 use nutrient-specific systems like traffic lights, 11 provide health endorsements, and 4 use summary scores, showing significant variation in how countries communicate nutrition information.
A 2026 systematic review of 42 nutrient profile models found considerable heterogeneity across labeling systems, indicating limited scientific consensus on which approach is most effective for reducing diet-related diseases.
The Quick Take
- What they studied: How different front-of-package food labeling systems work and whether they accurately identify healthy versus unhealthy foods
- Who participated: This wasn’t a study of people: it was a review of 42 different labeling systems used around the world, examining both published research and real-world examples
- Key finding: All 42 labeling systems try to limit sugar, and most limit salt and saturated fat, but there’s no agreement on which system works best
- What it means for you: The label on your food package is designed to help you make healthier choices, but the specific way it’s labeled might differ depending on where you live. No single system is proven to be perfect for everyone
The Research Details
Researchers conducted a systematic review, which means they searched through scientific databases and other sources to find every nutrient profile model (NPM), basically, every system that rates how healthy a food is based on its ingredients. They found 42 different systems used around the world. These systems fall into different categories: some use warning labels (like red flags for unhealthy foods), some use traffic-light colors (red, yellow, green), some give health endorsements (like “heart healthy”), and some use simple scores or numbers. The researchers carefully examined what each system measures and how well it actually works at identifying healthy foods.
Front-of-package labels are one of the most important tools governments use to fight diet-related diseases like obesity, diabetes, and heart disease. When people can quickly see if a food is healthy or unhealthy just by looking at the package, they’re more likely to make better choices. However, if every country uses a completely different labeling system, it becomes confusing for people and harder for food companies to follow the rules. Understanding which systems work best helps governments make better decisions about what labels to require.
This is a systematic review, which is one of the highest-quality types of research because it looks at all available evidence rather than just one study. The researchers examined both published scientific studies and real-world examples (called grey literature), which gives a complete picture. However, the review only found that 9 of the 42 systems had been tested to see if they actually work, and only 3 had been thoroughly tested. This means many labeling systems are being used without strong proof that they help people make healthier choices.
What the Results Show
All 42 labeling systems reviewed limited the amount of sugar allowed in foods labeled as healthy: this was universal across every single system. Most systems (the majority) also limited sodium (salt) and saturated fat. This shows there’s strong agreement among experts that these three nutrients are the biggest concerns for public health. However, beyond these three nutrients, the systems disagreed significantly. Some systems focused on calories, some on fiber, some on additives, and some on other nutrients. This lack of agreement is important because it means there’s no scientific consensus on what makes a food truly “healthy.” The researchers found that only 9 of the 42 systems had been tested in real studies to see if they actually helped people choose healthier foods. Of those 9, only 3 had strong evidence that they worked. This means most labeling systems are being used without solid proof that they accomplish their goal.
The systems fell into five main categories: warning labels (15 systems) that highlight unhealthy foods, nutrient-specific systems like traffic lights (11 systems), health endorsements that say a food is good for you (11 systems), summary scores that give foods a number or grade (4 systems), and other types (1 system). The fact that warning labels are the most common type suggests that telling people what to avoid might be more effective than telling them what to choose. The review also found that different regions of the world use very different approaches, there’s no global standard, which can confuse consumers and make it harder for food companies that sell internationally.
This systematic review builds on previous research by gathering all known labeling systems in one place for the first time. Earlier studies looked at individual systems or compared just a few systems, but this research provides a complete picture of the landscape. It confirms what many experts suspected: that while there’s agreement on the basics (limiting sugar, salt, and unhealthy fat), there’s significant disagreement on the details. This review essentially shows that the field of nutrition labeling is still developing and hasn’t reached a clear consensus.
The biggest limitation is that most labeling systems haven’t been rigorously tested. Only 9 of 42 systems had research showing whether they actually work, and only 3 had strong evidence. This means the review can describe what systems exist and what they measure, but can’t definitively say which ones are best for helping people make healthier choices. Additionally, the review looked at systems from different countries and time periods, so some systems may have been updated or changed since the review was conducted. Finally, the review focused on what the systems measure but didn’t deeply examine how well they work in real-world situations where people are actually shopping for food.
The Bottom Line
If you’re shopping for food, look for labels that highlight sugar, salt, and saturated fat content: these are the nutrients that all experts agree matter most. If your country uses a specific labeling system (like traffic lights or warning labels), learn how to read it so you can make informed choices. Governments should consider adopting or developing labeling systems that have been tested and proven to work, rather than using untested systems. There is moderate confidence in this recommendation because while the evidence supports limiting these three nutrients, the best way to communicate this to consumers is still being studied.
Everyone who buys food should care about understanding nutrition labels, especially people managing diabetes, heart disease, or weight. Parents choosing food for their families should pay special attention to these labels. Policymakers and government health officials should use this research to decide which labeling system to require in their countries. Food companies need to understand that labeling standards may change as evidence improves. People with specific health conditions should talk to their doctor or dietitian about how to use these labels for their particular needs.
You can start using nutrition labels to make better choices immediately, the benefit is not delayed. However, if a government switches to a new labeling system, it may take several months for people to learn how to read it and for it to influence shopping habits. Research suggests that meaningful changes in population health from better labeling take 1-2 years to become visible, as people gradually shift their food choices.
Frequently Asked Questions
What do front-of-package food labels actually do?
Front-of-package labels help you quickly identify whether a food is healthy or unhealthy without reading all the detailed nutrition information. A 2026 systematic review found 42 different labeling systems worldwide, but only 3 have strong proof they actually help people make better food choices.
Why do different countries use different food label systems?
According to a 2026 Nature Food review, there’s no scientific agreement on the single best labeling system. Different countries developed their own systems based on local preferences and health priorities, with 15 using warning labels, 11 using traffic lights, and 11 using health endorsements.
Which nutrients do all food labels limit?
All 42 labeling systems reviewed in 2026 limit sugar, and most also limit sodium (salt) and saturated fat. These three nutrients are universally recognized as the biggest dietary concerns for preventing obesity, diabetes, and heart disease.
How do I know if a food label is actually helpful?
Look for labels that highlight sugar, salt, and saturated fat: these are the nutrients all experts agree matter most. A 2026 systematic review found that warning labels and traffic-light systems have the most research supporting their effectiveness in helping shoppers choose healthier foods.
Should I trust all food labels to tell me if something is healthy?
Not all labels are equally reliable. A 2026 systematic review found that only 3 of 42 labeling systems have strong scientific evidence they work. Always check the detailed nutrition facts panel, especially for sugar, sodium, and saturated fat content, rather than relying solely on front-of-package labels.
Want to Apply This Research?
- Track your daily intake of sugar, sodium, and saturated fat for one week, then compare it to recommended limits. Most adults should consume less than 25-36 grams of sugar, less than 2,300 mg of sodium, and less than 20 grams of saturated fat per day. Use the app to scan food labels and log these three nutrients specifically.
- When shopping, use the app to compare two similar products and see which one has lower sugar, sodium, and saturated fat. Choose the healthier option at least 3 times per week. Over time, this habit will naturally shift your purchases toward healthier foods without requiring you to memorize nutrition information.
- Set a weekly goal to reduce sugar intake by 5% compared to the previous week. Use the app to track this metric every Sunday evening. After 8 weeks, reassess your baseline and set a new reduction goal. This gradual approach is more sustainable than trying to make drastic changes all at once.
This article summarizes a systematic review of labeling systems and should not be used as medical advice. While nutrition labels are designed to help you make healthier food choices, they are just one tool. People with specific health conditions, allergies, or dietary restrictions should consult with a registered dietitian or healthcare provider for personalized nutrition guidance. The effectiveness of any labeling system depends on individual understanding and application. This research does not replace professional medical or nutritional advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
