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Revista de Nutrição

Print version ISSN 1415-5273

Rev. Nutr. vol.26 no.4 Campinas July/Aug. 2013

http://dx.doi.org/10.1590/S1415-52732013000400002 

ORIGINAL ORIGINAL

 

Processed foods aimed at children and adolescents: sodium content, adequacy according to the dietary reference intakes and label compliance1

 

Alimentos processados voltados para crianças e adolescentes: concentração de sódio, adequação em relação aos níveis de ingestão dietética de referência e conformidade da rotulagem

 

 

Vera Favila RibeiroI,*; Marisilda de Almeida RibeiroII; Margarida Angélica da Silva VasconcelosIII; Samara Alvachian Cardoso AndradeIV; Tânia Lúcia Montenegro StamfordIII

IUniversidade Federal de Pernambuco, Centro Acadêmico de Vitória, Núcleo de Nutrição. Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brasil
IIUniversidade Federal de Pernambuco, Departamento de Nutrição. Vitoria de Santo Antão, PE, Brasil
IIIUniversidade Federal de Pernambuco, Centro de Ciências da Saúde, Departamento de Nutrição. Recife, PE, Brasil
IVUniversidade Federal de Pernambuco, Centro de Tecnologia, Departamento de Engenharia Química. Recife, PE, Brasil

 

 


ABSTRACT

OBJECTIVE: This study determined the sodium content of processed foods aimed at children and adolescents and the adequacy of its content in relation to the dietary reference intakes, and verified label compliance.
METHODS: The sodium content of 17 food samples (instant noodles, breaded items, hamburger patties, hot dogs and bologna sausages) was determined by flame photometry and chloride titration, and the results were compared with nutritional data. The labels were checked for compliance with the pertinent laws.
RESULTS: According to flame photometry and chloride titration, 13 and 5 products, respectively, had sodium contents that exceeded those reported on the nutrition facts label by more than 20%. All samples had more than 480mg of sodium per serving. The tolerable upper intake level for sodium for children aged 4-8 years was exceeded in 8 instant noodles and 3 breaded items according to flame photometry, and in 9 items according to chloride titration. Regarding the legislation, 5 products used a daily reference intake other than that provided by the legislation to report their percent sodium content per serving. Moreover, the serving sizes of 3 instant noodles, the terminology used in 1 instant noodles and the protein content of 1 breaded item were also not compliant with the legislation.
CONCLUSION: The sodium contents in the study samples were high and there was no regard for the legislation.

Indexing terms: Food labeling. Processed foods. Sodium chloride.


RESUMO

OBJETIVO: Determinar o teor de sódio em alimentos processados voltados para crianças e adolescentes, averiguar a adequação do teor encontrado em relação aos níveis de ingestão dietética de referência e verificar a conformidade das informações veiculadas na rotulagem.
MÉTODOS: Análise experimental do teor de sódio em 17 amostras (massa instantânea, empanado, hambúrguer, salsicha e mortadela) pela fotometria de chama e determinação de cloretos por volumetria. Os resultados foram comparados aos dados das informações nutricionais. A conformidade da rotulagem foi verificada a partir das legislações pertinentes.
RESULTADOS: Houve variação maior que 20% entre o teor de sódio analisado e o declarado em 13 produtos pela fotometria de chama, e em 5, pela volumetria. Todas as amostras apresentaram mais de 480mg de sódio/porção e o limite de ingestão adequada para crianças de 4 a 8 anos foi ultrapassado, pela fotometria, nas 8 massas instantâneas e em 3 empanados. Pela volumetria, a oferta de sódio ultrapassa os níveis de ingestão recomendados para crianças entre 4 e 8 anos em 9 amostras analisadas. Em relação à legislação: 5 amostras apresentaram desacordos nos percentuais de referência estabelecidos; a regulamentação das porções dos alimentos foi descumprida por 3 massas instantâneas; 1 produto dessa categoria utilizou-se de denominação incorreta; e 1 empanado apresenta teor proteico menor que o estabelecido.
CONCLUSÃO: Verificou-se elevado teor de sódio nos alimentos e desrespeito às legislações vigentes.

Termos de indexação: Rotulagem de alimentos. Alimentos processados. Cloreto de sódio.


 

 

INTRODUCTION

In the last decades, the consumption of processed foods such as instant noodles, hot dogs, bologna sausage, hamburger patties and breaded items has increased, mainly because of their fast preparation and affordability. Their taste, obtained with food ingredients and additives, is also appealing to most consumers who use them in place of or along with the main meals, especially meals for children and adolescents.

In order to meet the demand for these products, the food industry offers the convenience desired by adults and attractive packaging for the youth. However, the addition of sodium to processed foods should be monitored, justifying the required nutrition facts label.

The increasing consumption of processed foods along with the addition of salt during cooking and at the table are the main causes of the excessive sodium intake of the Brazilian population1,2. Consequently, the Ministry of Health presented a Plan for Fighting Chronic Non-communicable Diseases (CNCD), which includes actions to promote healthy diets and includes a goal to reduce the mean salt consumption of 12g to 5g by 20223.

In order to reach these goals, Ministry of Health and many food industry associations began signing agreements in 2011 to reduce the sodium content of many foods, such as instant noodles, breads, cakes, corn chips, potato chips, mayonnaise, sweet and savory cookies, breakfast cereals and seasonings4.

These government actions are very important, but since the nutrient content reported on the label can stem from chemical analyses or calculations based on product formulation5, and since the Brazilian legislation allows the contents reported on the label and those determined analytically to differ by as much as 20%6, it is important to check the accuracy of the reported data.

In addition to the nutrition facts label and other compulsory information, each product has particularities that must comply with various resolutions and normative instructions, and the packaging is the consumer's information source. Therefore, it is essential to verify if the legislation is being followed.

The objectives of this study were to determine the sodium content of processed foods whose packaging aims at children and adolescents, verify if their sodium contents are in agreement with the daily reference intakes and verify if the information on the label is in conformity with the legislation.

 

METHODS

The study food items were chosen based on Agência Nacional de Vigilância Sanitária's (Anvisa, National Sanitary Surveillance Agency) Technical Communication nº 42/20107, which contains the nutritional profile of some processed foods with high sodium, saturated fat and sugar contents that are usually consumed by the Brazilian population. The inclusion criteria were the possibility of using the food to replace or complement a meal, and the presence of elements on the packaging that appealed to children and adolescents.

Seventeen food items were analyzed, namely eight instant noodles from three different brands, one hamburger patty, one bologna sausage, two hot dogs from two different brands and five breaded items from three different brands.

Once the samples were acquired, the nutrition facts labels were recorded in a form created for this purpose and compared with the resolutions provided by the executive board of directors of Anvisa6,8-10 and with the normative instructions provided by the Ministério da Agricultura e Pecuária (Ministry of Agriculture, Livestock and Supply)11-13.

The raw samples were ground and homogenized by a food processor for approximately 90 seconds. The seasonings of the noodle samples were homogenized together with the noodles. An aliquot of 5g of each sample was placed in a porcelain capsule previously desiccated and weighed by an analytical scale of the brand Sartorius BL2105. The samples were burned by a Bunsen burner until no more smoke was emitted.

The ashes were obtained as recommended by the Association of Official Analytical Chemists14 (AOAC). Sodium content was quantified by flame photometry as recommended by the AOAC15 and the chloride in sodium chloride was quantified by the method 028/IV of Institute Adolfo Lutz16, where the sodium content is estimated to be 40% of the amount of chloride found.

These quantitative techniques were chosen because of the high sodium contents normally found in processed foods and because chloride titration and sodium quantification by flame photometry are official methods used by the Anvisa.

In order to verify the adequacy of the sodium content, the sodium content per serving reported on the label and that determined analytically were compared with the Adequate Intake (AI) values for children and adolescents aged 4-8 and 9-18 years and with the tolerable Upper Intake Levels (UL) for children and adolescents aged 4-8, 9-13 and 14-18 years17.

The experimental results were submitted to Analysis of Variance (Anova) and compared by the Duncan test, using a probability level of 5%. The statistical treatment was done by the software Statistica for Windows 7.0".

 

RESULTS

Table 1 shows the food characteristics and marketing strategies present on the labels and the reported sodium contents of the 17 study foods.

The label contents of 5 of the 17 study products did not comply with the legislation, violating norms RDC nº 360/36, RDC nº 359/310, RDC nº 263/58 and IN nº 6/111.

The labels of all study products were in compliance with the legislation regarding the listing of nutrients and respective percentages of their daily requirements. However, 5 did not use the established daily reference intakes. The nutrition facts label of the study hamburger patty reported a sodium content of 629mg of sodium per serving, which, according to the said label, corresponds to 13% of the daily reference intake. However, if the considered daily reference intake is 2,400mg of sodium6, the reported amount corresponds to 26% of the daily reference intake.

Three instant noodles also used daily reference intakes different from those provided by the legislation. The percentages of proteins and vitamins B1, B2, B3 and B6 in the instant noodles D and E refer to the requirements of children aged 7-10 years, while the percentages of the same vitamins in the instant noodles H refer to the requirements of children aged 4 to 6 years. The other nutrients use the daily intake references provided by the resolution6.

Companies may include other nutrients on the nutrition facts label if they exceed 5% of the Daily Reference Intake (DRI)6 per the serving size indicated on the label. The breaded item D incorrectly reports calcium. Its content of 23.0mg per serving corresponds to only 2% of the DRI, not 5%, which would be equivalent to 57.5mg.

The serving sizes reported on the labels of three instant noodles did not comply with the serving size of this type of food provided by the legislation, which is of 80g. The packaging of the instant noodle H contained 80g of product, but the reported serving size was 33g, and the reported nutrient contents were for this serving size. On the other hand, the packaging of the instant noodles D and E did not contain 80g but 64g, that is, less than the amount required by the legislation10.

The technical norms for the denomination of grain and starchy products, flours and brans8 were also violated. The instant noodle H consisted of wheat flour and cassava starch and called itself instant noodle. However, according to the legislation, noodles are made exclusively from wheat flour and/or durum wheat derivatives. When another source of starch is added, the product is classified as a dough mix.

The identity and quality standard for breaded products requires a minimum protein content of 10%11. The breaded item D had 22.0g of protein, representing a protein content of 9%. Therefore, it was not in compliance with the law, since it should contain at least 24.4g of protein.

Figure 1 shows that the difference between the reported and quantified sodium contents exceeded 20% in 13 products analyzed by flame photometry and 5 analyzed by chloride titration. Therefore, these products are not in compliance with the norm RDC 360/036.

Based on flame photometry, all 17 samples are high in sodium since all of them have more than 480mg of sodium per serving18. Eight instant noodle samples and three breaded items analyzed by flame photometry exceeded the UL for sodium for children aged 4-8 years. Additionally, all 17 study products had sodium contents in excess of 50% of the UL for all age groups. Finally, the UL for sodium for children aged 4-8 years was exceeded by six instant noodle samples (Table 2).

Table 3 compares the sodium contents per serving determined by chloride titration with the sodium DRI for children and adolescents. According to this method, only hot dog B was not classified as a high-sodium food18. The sodium contents of 9 study products exceeded the UL for children aged 4-8 years and all 8 instant noodles provided more than 50% of the UL for all age groups.

 

DISCUSSION

Since the nutritional data reported by the food industry can be determined by chemical analyses and calculations based on the formulation of the product5, nutrient contents may differ. These different methods may partially explain the difference between the contents reported on the label and those found analytically by the present study, which, according to the legislation, should not exceed 20%6.

Thirteen samples analyzed by flame photometry and 5 by chloride titration exceeded the tolerated difference (Figure 1). Other studies found differences in sodium contents in excess of 20% in 5 (50%) pastas19 and 64 (57%) snack and potato chips20, corroborating the results of the present study. These excessive differences show that it is essential to effectively survey all nutrition information reported on the labels to check their accuracy, allowing well-informed consumers to correctly choose the most appropriate food item among all those available.

Comparison of the sodium contents reported on the labels with those determined analytically shows that the differences between both are significant (p<0.05) in 12 samples analyzed by flame photometry and 6 samples analyzed by chloride titration. Many factors may influence the results of the chemical analyses, such product formulation and analytical method. The determination of chlorides by titration assesses salinity16 while flame photometry determines the content of sodium ions directly15. This may explain the differences between the contents found by this study.

Table 4 shows that the mean sodium contents of same-category foods vary widely, which is confirmed by the literature21,22 and Anvisa4,23. This study used the means obtained by flame photometry, which is more accurate. The variations seen in same-category foods show that it is possible to produce foods with lower sodium contents without affecting the technology used for their production4,7,24.

Foods with colorful packaging and popular characters, drawings and games attract the young public and indicate to adults that they are meant for children. However, this is not the case since the mean sodium contents of these products quantified by this study are higher than those found in similar products by Anvisa4,7.

Moreover, Table 2 shows that, according to flame photometry, all study products contained more than 480mg of sodium per serving, so they are considered high-sodium foods18. It is also noteworthy that the serving sizes are not necessarily equal to the consumed portion sizes and the meal may have other high-sodium foods, elevating sodium ingestion and significantly contributing to an excessive sodium intake by children and adolescents.

Given the high intake of processed foods by children and adolescents25-28, the replacement of meals by snacks24,29 and the high sodium contents of the study foods, one can infer that they contribute to a high sodium intake.

The existence of foods that provide as much as 100% of the UL for sodium, such as some instant noodles, shows that sodium content exceeds reasonable parameters and, as intake exceeds the UL, the associated health hazards also increase30.

The risk factors for CNCD are widespread in society. People are often exposed to them early and/or during most of their lifetime3. A study assessed the introduction of processed foods to infants in public daycare centers of São Paulo and found that instant noodles are offered to 77.8% of the children aged 12 months or less31. Another recent study with 1,131 students aged 7 to 14 years found a prevalence of pre-hypertension of 9.6% and of hypertension of 4.8%; the prevalences were greater in females, individuals with excess weight and individuals with inappropriate diets32.

Since the consumption of processed foods by children and adolescents increases because of women working outside the home, greater convenience, quick preparation, durability and acceptance26, peer influence, higher purchase power, habit of eating out27, and advertising and marketing25,28, asking the food industry to reduce sodium content of their products is considered more effective than asking people to reduce the consumption of these products33.

This reduction in the sodium content of processed foods will be achieved according to the goals established by the MH and the food industry for the coming years. However, given the differences between the reported and quantified sodium contents, monitoring will be necessary to ensure industry compliance with these goals. This agreement, along with other health-promoting actions, will greatly contribute to the prevention and reduction of CNCD, including hypertension3.

Since some study products were not in compliance with the legislation, better surveillance is necessary. Given that the pertinent laws have been around for a number of years, it is unacceptable that packaging still contains misleading and incorrect information, that products do not comply with the defined identity and amount, and that compulsory nutrition information is manipulated to become one more marketing strategy.

The technical regulation that establishes the minimum requirements for the supply, marketing, advertising, information and other correlated practices that aim to market foods with high sugar, saturated fat, trans fat and sodium contents, and beverages with low nutrient contents, do not apply to food labeling23, so this important marketing vehicle continues to be available to the food industry.

 

CONCLUSION

The results show that the study foods contain high sodium contents that must be reduced. The government's goal to reduce sodium intake and its partnership with the food industry to reduce the sodium content of many foods are essential initiatives but not enough. Encouraging the consumption of fresh foods and providing effective education measures are critical for the promotion of healthy eating habits and minimization of the prevalence of CNDC.

CONTRIBUTORS

VF RIBEIRO responsible for data collection and analysis and article writing. MA RIBEIRO responsible for project creation and article review. MAS VASCONCELOS responsible for reviewing data analysis and the article. SAC ANDRADE responsible for the statistical analysis of the data. TLM STAMFORD co

responsible for project creation and article review.

 

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Received on: 18/6/2012
Final version on: 30/10/2012
Approved on: 1/3/2013

 

 

* Correspondência para/Correspondence to: VF RIBEIRO. E-mail: <vfavila@hotmail.com>
1 Article based on the dissertation of VF RIBEIRO intitled "Alimentos processados para crianças e adolescentes: concentrações de sódio e conformidade da rotulagem". Universidade Federal de Pernambuco; 2011.

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