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Labels - Interface between nutrition science and consumer decision
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Friday, 27 March, 2026, 15 : 00 PM [IST]
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Dr Mansi Patil
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Excess dietary salt intake is a major modifiable risk factor for hypertension, cardiovascular disease, stroke, and chronic kidney disease. The World Health Organization (WHO) recommends limiting salt intake to less than 5 g per day (approximately 2 g sodium), yet global consumption consistently exceeds this threshold, largely driven by the increased intake of processed and packaged foods. In many countries, including India and Australia, over 70% of dietary sodium comes not from discretionary salt added during cooking or at the table, but from commercially prepared foods.
Against this backdrop, food labelling has emerged as a critical public health tool to empower consumers to make informed choices and reduce population-level salt intake. This article explores how food labels can be effectively used to reduce salt consumption, examines common labelling formats and claims, and highlights challenges and opportunities in translating label information into healthier dietary practices.
Salt, Sodium, and Health: Why Labels Matter: Salt (sodium chloride) plays an essential physiological role in fluid balance, nerve transmission, and muscle contraction. However, excessive sodium intake disrupts this balance, contributing to worsening elevated blood pressure and increased cardiovascular risk. The relationship between sodium intake and blood pressure is dose-dependent and linear, with no clear threshold below which further reductions cease to be beneficial, particularly for high-risk populations such as older adults, individuals with hypertension, diabetes, or chronic kidney disease.
Food labels are a primary interface between nutrition science and consumer decision-making. Unlike nutrition education campaigns, which require sustained engagement and behavioural change, labels offer point-of-purchase information that can directly influence food selection. When designed and interpreted effectively, food labels can shift consumer demand toward lower-sodium products, incentivise food reformulation, and support broader salt reduction strategies.
Understanding Sodium Information on Food Labels: Most packaged foods provide sodium information within a mandatory nutrition information panel. Sodium may be expressed in milligrams (mg) per serving and/or per 100 g, depending on regulatory requirements. While this information is scientifically accurate, its practical usefulness depends on consumer literacy, numeracy, and contextual understanding.
A major challenge is that consumers often underestimate their sodium intake due to confusion between “salt” and “sodium.” Sodium content is frequently listed without reference to salt equivalents, despite salt being the more familiar term. Since 1 g of sodium is equivalent to approximately 2.5 g of salt, failure to make this conversion explicit can obscure the true salt contribution of a food. Additionally, serving sizes declared on labels may not reflect typical consumption, leading to inadvertent underestimation of sodium intake when multiple servings are consumed.
To address this, many public health agencies recommend using per-100-g values rather than per-serving values to enable fair comparison across products. For example, foods containing more than 400 mg sodium per 100 g are generally considered high in sodium, while those with less than 120 mg per 100 g may be considered low-sodium options.
Front-of-Pack Labelling and Sodium Reduction: Front-of-pack (FOP) labelling systems have been introduced in several countries to improve the visibility and interpretability of nutrition information, including sodium content. These systems range from interpretive labels, such as traffic-light coding and warning symbols, to summary indicators like health star ratings. Traffic-light labels use colour coding (green, amber, red) to indicate low, medium, or high levels of nutrients of concern, including sodium. Evidence suggests that such interpretive labels are more effective than numeric information alone in guiding consumers toward healthier choices, particularly among populations with lower health literacy. Warning labels, which explicitly flag high-sodium products, have been associated with reduced purchase intentions and increased industry reformulation.
Health star ratings and similar summary indicators provide an overall nutritional assessment, incorporating sodium alongside other nutrients. While useful for quick comparisons, these systems may obscure high sodium content if offset by favourable attributes such as fibre or protein. Consequently, public health experts recommend that FOP systems retain nutrient- specific information for sodium to ensure transparency.
Nutrition and Health Claims: Interpreting Sodium-Related Terminology: Food labels frequently include nutrition claims related to sodium, such as “low salt,” “reduced sodium,” or “no added salt.” While regulated, these claims can be misleading if not carefully interpreted. For instance, “reduced sodium” typically indicates a relative reduction (often 25–30%) compared to a reference product, not necessarily a low absolute sodium content. Similarly, “no added salt” does not guarantee that the product is sodium-free, as sodium may still be present from natural ingredients or additives.
Health claims linking reduced sodium intake to heart health may enhance consumer trust and influence purchasing decisions, but they also risk creating a “health halo” effect, whereby consumers overlook other unfavourable nutritional aspects. Therefore, claims should always be interpreted in conjunction with the full nutrition information panel, rather than in isolation.
Translating Label Information into Consumer Behaviour: Despite widespread availability of nutrition labels, evidence indicates that consistent label use remains suboptimal. Time constraints, habitual purchasing, taste preferences, and price considerations often outweigh nutritional considerations at the point of purchase. Moreover, sodium reduction presents a unique challenge, as taste adaptation to lower salt levels occurs gradually and may initially reduce product acceptability.
Nevertheless, targeted interventions have demonstrated that label education can improve sodium-related decision-making. Practical strategies include encouraging consumers to compare similar products (e.g., breads, breakfast cereals, sauces) and choose the lowest-sodium option, selecting fresh or minimally processed foods, and using labels to identify hidden sources of sodium such as condiments, processed meats, and ready-to-eat meals.
Importantly, food labelling should not be viewed as a standalone intervention. Its effectiveness is enhanced when combined with public education campaigns, culinary skills training, and supportive food environments that increase the availability and affordability of lower-sodium products.
Implications for Policy and Public Health Practice: From a policy perspective, food labelling serves both informational and regulatory functions. Mandatory sodium disclosure creates accountability and facilitates monitoring of population intake, while interpretive labelling systems can shift market dynamics by rewarding healthier product formulations. Several countries have demonstrated that clear labelling, alongside voluntary or mandatory sodium targets, can lead to meaningful reductions in the sodium content of the food supply. However, disparities in label comprehension persist across socioeconomic groups, raising concerns about equity. Simplified, interpretive labels may help bridge this gap, but must be culturally appropriate and supported by education initiatives. Additionally, ongoing evaluation is essential to ensure that labelling policies keep pace with changes in the food industry and emerging scientific evidence.
Reducing population salt intake is a public health priority with substantial potential to prevent cardiovascular disease and related conditions. Food labels represent a critical link between nutrition science and everyday food choices, translating complex information into actionable guidance at the point of purchase. By improving consumer understanding of sodium information, strengthening front-of-pack labelling, and aligning nutrition claims with public health goals, food labelling can play a pivotal role in moving diets from label to table—and toward better health. Ultimately, empowering consumers to recognise and reduce hidden dietary salt is not only a matter of individual responsibility, but a shared commitment across policy, industry, and public health systems.
(The author is a National Executive Committee member, IAPEN India)
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