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Revista de Nutrição

Print version ISSN 1415-5273

Rev. Nutr. vol.26 no.1 Campinas Jan./Feb. 2013

http://dx.doi.org/10.1590/S1415-52732013000100008 

ORIGINAL | ORIGINAL

 

Development of a method for controlling salt and sodium use during meal preparation for food services1

 

Desenvolvimento de um método de controle de sal e sódio em unidades de alimentação e nutrição

 

 

Cristina Barbosa FrantzI, II; Marcela Boro VeirosI; Rossana Pacheco da Costa ProençaI, II; Anete Araújo de SousaII

IUniversidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pós-Graduação em Nutrição. Campus Universitário, Trindade, 88040-900, Florianópolis, SC, Brasil. Correspondência para/Correspondence to: AA SOUSA. E-mail: <anete@ccs.ufsc.br>
IIUniversidade Federal de Santa Catarina, Departamento de Nutrição, Núcleo de Pesquisa de Nutrição em Produção de Refeições. Florianópolis, SC, Brasil

 

 


ABSTRACT

OBJECTIVE: The study developed a method for controlling the amount of salt and sodium during food preparation, Controlling Salt and Sodium use During Meal Preparation for food services based on the Hazard Analysis and Critical Control Points principles.
METHODS: The method was conceived and perfected during a study case in a commercial food service located in Florianópolis, Santa Catarina, Brazil. Data were collected from technical cards, recipes and measurements during food preparation. The preparations were monitored and compared with criteria about the use of salt and sodium found in the literature. Critical control points were identified and corrective measures were proposed.
RESULTS: The result was a method consisting of 9 stages: (1) determination of the sodium content in the ingredients; (2 and 3) analysis of menu planning and sodium content; (4) follow-up of food preparation; (5) estimate of the amount of sodium used in the preparations; (6 and 7) selection and following of the preparations with average- and high-sodium content; (8) definition of the critical points and establishment of corrective actions for the use of salt and sodium; and (9) creation of recommendations for the use of salt and sodium.
CONCLUSION: The Controlling Salt and Sodium use During Meal Preparation may contribute to global discussions regarding the reduction of salt and sodium intakes and collaborate for the supply of nutritionally and sensorially appropriate meals with respect to salt and sodium content. It may also help to prevent non-communicable chronic diseases.

Indexing terms: Food service. Nutritional quality. Quality control. Restaurants. Salt. Sodium.


RESUMO

OBJETIVO: estudo desenvolveu um método de Controle de Sal e Sódio na Produção de Refeições para o processo produtivo de refeições comerciais e coletivas, com base nos princípios do sistema de Análise de Perigos e Pontos Críticos de Controle.
MÉTODOS: O método foi elaborado teoricamente e aperfeiçoado a partir de um estudo de caso realizado em uma unidade de alimentação e nutrição comercial em Florianópolis, Santa Catarina. Dados foram coletados durante o acompanhamento do processo produtivo de refeições, por meio de medições e registros. As operações foram monitoradas e comparadas com critérios sobre o uso de sal e sódio definido a partir da literatura científica.
RESULTADOS: Com a análise das operações foi possível identificar pontos críticos e definir ações corretivas. Como resultado, desenvolveu-se um método composto de 9 etapas de aplicação: (1) levantamento do teor de sódio dos produtos adquiridos, (2 e 3) análise do planejamento e do teor de sódio do cardápio, (4) acompanhamento do fluxo produtivo, (5) estimativa da quantidade de sal utilizada nas preparações, (6 e 7) seleção e acompanhamento de preparações com médio/alto teor de sódio, (8) definição de pontos críticos e ações corretivas para o uso de sal e sódio e (9) elaboração de recomendações para o uso de sal e sódio.
CONCLUSÃO: O método de Controle de Sal e Sódio na Produção de Refeições pode contribuir nas discussões sobre as iniciativas mundiais de redução do consumo de sal e sódio, colaborando com a oferta de refeições nutricional e sensorialmente adequadas com relação ao teor de sal e sódio, viabilizando ações de prevenção a doenças.

Termos de indexação: Unidade de alimentação e nutrição. Qualidade nutricional. Controle de qualidade. Restaurantes. Sal. Sódio.


 

 

INTRODUCTION

Kitchen salt is the main source of sodium in the human diet. One gram of sodium chloride corresponds to 17.1mmol or 393.4mg of sodium1. Sodium is also naturally found in foods, water and food additives2,3.

Although sodium is essential for maintaining vital functions, the amount needed by the human body to carry out its functions is small, roughly 184 to 230mg per day1. According to the North American Institute of Medicine3, adequate intake for individuals aged 9 to 50 years is 1500mg/day and the tolerable upper intake level is 2300mg/day.

People in many countries consume more than 2300mg of sodium per day, despite the recommendations4. In the United States of America (USA), New Zealand and Canada, for example, sodium intake exceeds 3400mg per day5-7. Sodium intake is estimated to be even higher in Brazil, roughly 4500mg/day8.

An increased supply of processed foods rich in fats, sugar and salt1,9,10 and the growing eating out trend10-12 have been identified as two of the greatest causes of high sodium intake4,13,14.

Some studies show that meals from restaurants, fast food establishments and cafeterias also contain high sodium content, often above the daily recommendation15-18.

These observations lead the World Health Organization (WHO) to hold a technical meeting in 2006 as part of the Global Strategy on Diet, Physical Activity and Health (DPAS) to discuss measures that promote the reduction of salt and sodium intakes globally. One of the strategies discussed by the WHO is the reformulation of meals and, for this end, the organization counts with the participation of restaurants and cafeterias1,19.

Since then, some countries have taken action to reduce salt intake, such as Australia, Canada, Switzerland, Belgium and others. In Europe, Finland started taking measures in 19701,13,20,21.

Some measures that affect the out-of-home eating and processed food industries have already been taken, such as the Swiss Salt Strategy of 2008-2012, which set a goal of reducing the salt content of processed foods and away-from-home meals by 16% in four years22. In Canada, the Canadian Restaurant and Foodservices Association (CRFA) developed a guide for reducing the sodium content of the menus and, consequently, reduce the sodium intake of the population by 30% until 201623.

In Brazil, the General Coordination of Food and Nutrition Policy (CGPAN) is considering the development of a manual of good nutrition practices to help the out-of-home eating sector with the task of reducing the sodium content of the menu. Since Brazilians are eating out more and more often, this document is urgently needed if the intake goal of 5g/day recommended by the Food Guide for the Brazilian Population is to be achieved. In other words, the current intake needs to be halved24,25.

Except for the Canadian guidelines23, there are no papers in the scientific literature helping dieticians and cooks to reduce the amount of sodium and salt in meals. The documents found on this theme were either written for the industry or contain general recommendations for the population.

Some quality control methods have been developed for the sector. The Hazard Analysis and Critical Control Points (HACCP) focuses on the production of safe foods from the sanitary viewpoint26 and the Nutritional and Sensory Quality Analysis of Preparations (AQNS) focuses on nutritional and sensory aspects27. There are other methods, such as the Assessment of the Gastronomic Heritage Quality (AQPG)28 and the Trans Fat Control in Food Production (CGTR)29.

The development of the AQNS, AQPG and CGTR was based on the HACCP - identification of critical points, creation of control measures and critical limits, manner of monitoring and implementation of corrective actions27-29.

Considering the HACCP principles and having the abovementioned quality control methods for food services as reference, this study aimed to develop a method to identify critical points of sodium and salt use. Hence, this study aims to aid food services to implement corrective actions during food preparation so that the foods are nutritionally and sensorially appropriate.

 

METHODS

The study is a qualitative research with a case study design. This proposal was constructed as the AQNS, AQPG and CGTR, as follows:

1. Identification, in the scientific literature, of the critical points of salt and sodium use during meal preparation, especially of dishes with moderate or high sodium contents;

2. Creation of a pilot method for systemizing the criteria for controlling salt and sodium, and selection of instruments for data collection (protocols);

3. Administration of the pilot method for meal preparation to a previously selected establishment;

4. Review of the pilot method after administration;

5. Preparation of recommendations for the administration of the new method.

Steps 1 and 2 led to the development of three analysis variables: (a) nutritional and sensory planning of the menus; (b) meal preparation process and (c) dish preparation process. These variables are described below:

(a) Nutritional and sensory planning of the menus: planning criteria (number of dishes containing salt, salt-based seasonings, commercial beef bases and meat tenderizers, and other moderate- and high-sodium ingredients); standardization (classification of the dishes into food groups or subgroups); standardized recipe cards (creation of standardized recipe cards listing amount of salt or reformulation of the existing cards); dish replacement scheme (having a list of replacements for planned or emergency replacements and criteria for the use of salt and/or moderate- and high-sodium products).

(b) Meal preparation process: supplier selection (determine the brands with the lowest sodium content and work with suppliers from those brands); food acquisition (verify the sodium content in products); receipt and storage (verify the sodium content in products, control the amount of high-salt/sodium foods sent to the food preparation area - salt, salt-based seasonings, processed sauces, commercial beef bases and meat tenderizers); pre-preparation and preparation (list seasoning products and methods for tenderizing and preparing meats and other dishes); meal decoration and distribution (list products used for decoration, replace dishes according to food group or subgroup and avoid replacing with dishes containing a higher sodium content, and make salt, grated parmesan cheese, sauces, seasonings and condiments readily available for the customers).

(c) Dish preparation process: identify ingredients with moderate and high sodium content, identify the preparation methods that can increase sodium content and control the prescribed use of salt and the sodium content of the dish.

Sodium content was classified according to the criteria used by the United Kingdom's Food Standard Agency (FSA), which uses traffic lights on food labels to reflect sodium content. According to this classification system, foods with moderate sodium content are those with 100mg to 600mg of sodium (or 0.3g to 1.5g of salt) per 100g of food; foods with high sodium content are those with more than 600mg of sodium (or more than 1.5g of salt) per 100g of food30.

The pilot method was used in a commercial food service located in Florianópolis, Brazil. Data were collected from May to June of 2010. The following criteria were used for selecting an establishment: it would have to serve at least one buffet meal (lunch or supper) and one small buffet meal (breakfast or afternoon snack) per day, from Monday to Friday; the person responsible for the establishment would need to agree to participate in the study and sign a free and informed consent form (in addition, the establishment would remain anonymous and the results would be disclosed to the person in charge); it would agree with a dietician's supervision, menu planning and use of standardized recipe cards. These instruments are essential for changing the use of salt and ingredients with high-sodium content during food preparation.

Data collection included the analysis of technical documents, direct observation and estimated salt use. The documents consisted of lunch menus, standardized recipe cards, list of dish replacements according to groups and/or subgroups and a manual of good practices.

The instruments used for direct observation were the three protocols. They were constructed with questions corresponding to previously determined indicators and a digital camera. A digital scale was used for estimating the amount of salt and quantifying the sodium content of the preparations. The scale (GURAL EGI-15, São José dos Pinhais, Paraná, Brazil) has a capacity of 15kg and an accuracy of 5g.

The technical cards and recipes of 1,260 preparations were analyzed. Of these, 294 were salads, 210 were cold side dishes, 588 were hot side dishes and 168 were meats. They corresponded to the menu of 42 days with 30 preparations per day. From this sample, 22 preparations with ingredients high in sodium were selected. The sodium content was determined by weighing these ingredients and getting the concentration from the nutritional facts table. For fresh ingredients, sodium content was taken from the Brazilian Food Composition Table (TACO)31. Preparations served daily were also followed to compare the amount of sodium added with the amount listed in the technical cards (white rice, whole rice, red sauce, white sauce and pasta). Hence, a total of 27 preparations were followed.

The amount of salt available during lunch was determined by estimating the amount of salt in all the foods served for lunch over three days. This was accomplished by weighing all dishes that listed salt in the ingredient list and the total salt used in their preparation. The total weight of the leftovers on the pass-through dishes and buffet table were deducted, as well as the salt they contained. The amount of salt contained in all the dishes served during lunch was transformed into a percentage by weight to facilitate comparison with the Food Standards Agency guidelines.

The amount of salt in food items boiled in salted water, such as pasta, was estimated according to Sánchez-Castillo & James32 who reported that these foods absorb roughly one-third of the salt added to the water.

The collected data were organized, described and systemized to improve the method and prepare the recommendations, including strategies, for use in food services.

In order to comply with ethical principles, the person in charge of the establishment was informed about the objectives of the study, promised anonymity and informed of the results of the study.

 

RESULTS

The method for Controlling Salt and Sodium use during Meal Preparation (CSMP) was structured in nine phases, as follows: (1) Determination of the sodium content of acquired food items; (2) Analysis of the menu planning criteria. (3) Analysis of the sodium content of the dishes; (4) Monitoring of the meal preparation process from supplier selection to distribution; (5) Estimate of the amount of salt used during preparation; (6) Listing of the dishes by group or subgroup according to their sodium content; (7) Monitoring of meal preparation; (8) Determination of the critical points and corrective actions for the use of salt and sodium during the different stages of meal preparation; (9) Preparation of recommendations for controlling the use of salt and sodium during meal preparation.

The first seven phases involve analyzing the amount of salt and sodium used during preparation and recording the information in forms. The eighth phase consists of analyzing the forms and identifying the critical points of salt and sodium use. The ninth step involves preparation of recommendations for controlling the use of salt and sodium.

In addition to forms, the CSMP method contains a glossary to help the understanding of each phase.

In order to clarify the use of the method, the results obtained in the study food service with the implementation of stage 5 (Table 1) are presented below.

The use of the seven first stages of the CSMP method in this unit contributed for the determination of possible critical points for the use of salt and sodium (Charts 1, 2 and 3).

After the identification of the critical points, the CSMP indicates the need of determi-ning the strategies needed for implementing corrective actions. These strategies are called recommendations (stage 9) to operationalize corrective actions. For the study food service, the following recommendations were established:

Menu planning:

- Standardize the menu by preparation group and/or subgroup.

- Include sodium content of the preparation in the standard recipe and/or technical card to facilitate menu planning.

- Reduce the number of preparations that use foods with average- and high-sodium content, always prefer fresh foods.

- Selection of suppliers, acquisition, receipt and storage;

- Specify food types according to the Quality and Identity Standard (PIQ) for sodium content during the selection of suppliers and food acquisition. The suppliers or manufacturers should be encouraged to sell and/or reduce the amount of sodium in their products and if this is not possible, the food service should find ways to replace these products, such as producing these items on site, such as condiment mixtures, for example.

Train the individuals in charge:

- During acquisition, by identifying the sodium content on the labels, and purchase items with preestablished PIQ.

- When receiving the items, identify the sodium content according to PIQ.

- When requesting items, verify the amount of salt and ingredients with average and high-sodium content according to the menu, technical cards and standard recipe.

- Control the amount of salt that leaves the storage area to the production area. Salt and processed items with average and high sodium content should be weighed and cleared to the production area only in the amounts recommended in the technical cards or standard recipe, according to shift (breakfast, lunch, supper).

Prepreparation and preparation

- Perform culinary tests to standardize the marinated recipes according to the meats menu in an attempt to reduce their salt content by replacing some of it with aromatic herbs and spices.

- Standardize the addition of salt according to the utensil and amounts specified in the technical card or standard recipe.

- Plan the addition of salt in preparations cooked in brine such as pasta, some vegetables and salad grains, considering that these foods absorb roughly one-third of the added salt.

- Revise the standard recipes and/or technical cards with gradual reduction of the sodium content by training the kitchen staff.

Distribution

- Implement replacement lists for preparations that contain high sodium content.

- Train the kitchen staff periodically on the groups and/or subgroups of preparations according to sodium content and correct ways of replacing them.

- Make planned replacements according to the replacement list (never choose preparations with more sodium than the original preparation).

- Supply information about the sodium content of the preparations (per portion or 100 grams of preparation) for the customers.

General recommendations for CSMP implementation

- Sensitize the kitchen staff to the importance of reducing and controlling the salt and sodium content during food preparation.

- Develop the kitchen staff skills: read and understand product labels to identify and classify sodium content; proper use of technical cards and standard recipes, replacement lists and standard utensils for the addition of salt to the preparations.

- Count on the professional in charge and kitchen staff for the implementation and management of CSMP. Note that to control the use of salt and sodium successfully, it is essential to involve the staff.

In addition to the use of forms during phases 1 to 8, the CSMP method recommends monitoring of the food service during the transition period. The continuous improvement of the establishment will require periodical reassessment of food preparation, for example, at every six months or as often as the manager sees fit, to make sure the kitchen staff complies with the recommendations.

Note that the method does not include customer Nutrition Education, since the approach used is for controlling the productive process of the food service to promote health. Its objective is to offer meals with controlled salt and sodium content and options with varied flavors.

 

DISCUSSION

Recommendations for reducing dietary salt and sodium consumption may be found in guidelines and documents that cover health promotion and healthy eating1,24. However, as mentioned earlier, documents that suggest procedures to control the use of salt and sodium in food services are scarce. The Canadian Guide23 is an example of a document created for this sector. The guide recommends that to reduce the sodium content of the menu, the food service must first identify the sodium sources and uses in the menu; next, quantify the sodium content of the preparations; identify the preparations that need to reduce salt and sodium content; test and implement strategies to reduce salt and lastly, reassess the use of sodium.

There are similarities between the Canadian Guide and the CSMP, which may indicate congruence between the general recommendations and the advancement of the initiatives to reduce salt and sodium by this sector. However, although similar, the CSMP method is not based only on recommendations, since it proposes a way to operationalize the implementation of this control in the productive process regardless of the production volume. The CSMP is very important in mass cooking. Generally, greater volumes require changes in the way the foods are prepared, since they are not always prepared in the healthiest of ways.

For the Controlling Salt and Sodium use During Meal Preparation, menu planning is the starting point for reducing and controlling the amount of sodium in the preparations. Hence, if the amount of salt and sodium of the preparations is considered in menu planning, the subsequent procedures must respect the established logic. One way of including these criteria in this initial stage is through the identification of the ingredients high in sodium, always preferring fresh foods. Such choices are also suggested in the literature33, as well as in the Canadian Guide. Examples of these practices include preferring fresh vegetables instead of canned vegetables and marinating meats with olive oil and fruit juices instead of ready sauces23.

However, sometimes it is not possible to replace certain ingredients, for example, cheese in lasagna. In this case, it is necessary to choose products very carefully. The CSMP method recommends checking the labels to compare the sodium content of different brands since sodium content may vary widely between brands9,15,25,34.

The Controlling Salt and Sodium use During Meal Preparation is based on the daily intake recommendation given by the World Health Organization1, which is 2000mg of sodium. For lunch, 1000mg of sodium was considered, that is, half of the daily allowance. According to Philippi35, lunch is the main meal of the Brazilian population, representing roughly 35% of the daily energy intake. Bearing in mind that the estimate of the consumption of sodium by Brazilians is 4500mg8, the intake of 1000mg during lunch already represents a reduced intake.

To reach this goal, the lunch menu of the location where the CSMP will be used must be analyzed. In the case of the study food service, the menu consisted of the following groups of preparations: salads; rice/pasta; legumes; hot side dishes, such as pies, a preparation with vegetables or eggs; cold side dishes such as potatoes, pasta or grains served cold with some sauce; and meat. Salads were made without salt or ingredients with average- and high-sodium content, therefore they were not considered in the calculation of the sodium content of the meal.

Lunch in Brazil generally consists of rice and beans, meat, which is considered the main item in the meal, a side dish like potatoes, eggs or cooked vegetables served hot and a salad consisting of vegetables, served cold. These items compose a single dish which may or may not be followed by a dessert. This pattern is commonly found in the menus of companies, schools and hospitals36.

To calculate the total sodium in the menu, five groups of preparations were considered, except salads. To reach 1000mg of sodium, each preparation must contain a maximum of 200mg of sodium per portion. Hence, preparations with amounts above this amount should be reformulated. Note that the value of 200mg of sodium per preparation applies to the example of the study food service. Another amount may be established according to the characteristics of the menu of the food service where CSMP is implemented. Furthermore, the amount of 1000mg of sodium must be considered as an initial goal, and the unit may reduce it even further. However, the recommendation of the Worker's Food Program (PAT) is of 720 to 960mg of sodium per meal, whether lunch or supper37.

The World Health Organization1 recommends that the amount of sodium in dishes be reduced gradually to give customers a chance to adapt to the milder flavor. It takes an average of three months for the taste buds to adapt to the taste of low-sodium foods24,38,39. According to the Canadian guide for the food industry, consumers will hardly notice a sodium reduction of 10% to 25%40.

Because of this, the CSMP proposes a gradual reduction of the sodium content by performing culinary tests to maintain the sensory quality of the preparations. Note that the initial reduction should be of 10%.

Contrary to the CSMP method, the Canadian guide recommends that salt be reduced until an acceptable taste is achieved containing as little sodium as possible, reducing added salt slowly and gradually (5 to 10%) and subsequently submitting the dishes to consumer testing23. This guide recommends the use of herbs and spices but does not specify a rate for salt reduction.

The literature lists a number of alternatives for reducing the amount of salt and sodium in dishes without compromising taste to any significant degree, such as: using herbs, spices, acid seasonings (lime, vinegar), bulbs (onion, garlic) and herbal salt, marinate and tenderize meats mechanically or enzymatically (papain or bromelain). It also recommends avoiding high-sodium products (ketchup, pepper sauce, chili powder, beef bases, barbecue bases, soy sauce and processed meat tenderizers); washing canned vegetables and pickles before use; use fresh foods or minimally processed foods2,41,42. Therefore, there are many alternatives for the use of salt and food services are free to choose which ingredients and amounts can be used for dish reformulation.

Some of the alternatives listed above are included in the corrective actions suggested by the CSMP method, for example, marinating meats, washing canned foods and pickles before use, abolishing the use of processed meat tenderizers and beef bases, and preferring fresh ingredients.

It should be emphasized that the construction of the CSMP was limited to a specific type of food service: commercial and self-service. For this reason, future studies should consider the possibility of broadening the use of CSMP by using tests that include differences according to service type.

 

CONCLUSION

The Controlling Salt and Sodium use During Meal Preparation is a tool created to help dieticians and cooks to control the use of salt and sodium and offer nutritionally and sensorially appropriate meals. It presents specific recommendations for the preparation of meals in each of its various stages with consequent impact on operationalization, regardless of production volume.

The Controlling Salt and Sodium use During Meal Preparation may contribute to the implementation of the global recommendations for the reduction of salt and sodium intakes. Furthermore, the method may serve as basis for the creation of booklets for reducing sodium by the food service sector, as done by the Canadian Guide, and culminate with the creation of good nutritional practices. Another important point is the need of discussing labeling systems of processed foods so that individuals may identify the sodium content clearly, facilitating the control of the use of these products in meal production.

 

CONTRIBUTORS

CB FRANTZ, AA SOUSA, MB VEIROS and RPC PROENÇA worked to conceive the project, develop a collection instrument, interpret data and write and review the article.

 

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Received on: 19/1/2012
Final version on: 6/9/2012
Approved on: 2/10/2012

 

 

1 Article developed as part of dissertation data CB FRANTZ, called "Desenvolvimento de um método de controle de sal e sódio na produção de refeições". Universidade Federal de Santa Catarina; 2011. Support: Programa de Pós-Graduação em Nutrição da Universidade Federal de Santa Catarina, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior e Programa de Apoio ao Plano de Reestruturação e Expansão das Universidades Federais.

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