Mathilde Kersting1*
Hermann Kalhoff- 1Research Department of Child Nutrition, St. Josef-Hospital, University Hospital of Pediatrics and Adolescent Medicine, Ruhr-University Bochum, Bochum, Germany
- 2Pediatric Clinic Dortmund, Dortmund, Germany
- 3St. Josef-Hospital, University Hospital of Pediatrics and Adolescent Medicine, Ruhr-University Bochum, Bochum, Germany
Objectives: To show by the example of the Optimized Mixed Diet (OMD) for children and adolescents in Germany, how the different food and nutrient profiles of the traditional daily meals complement each other to achieve daily nutrient intakes that meet the Dietary References V.
Methods: The 7-day menu plan of the OMD with the usual 5 daily meals in Germany was used. The total nutrient intake from all meals was compared with the nutrient references. Then the composition of the meals was optimized.
Results: Although the cooked meal (lunch) provides only 25% of the daily energy intake, it is relatively rich (>25% of the daily intake) in most vitamins and minerals, which distinguishes it from the other meals. The cold main meals (breakfast, dinner) are rich in calcium and vitamin B2, due to the preferential use of milk in these meals. The two snacks each provide 12.5% of the daily energy intake.
Discussion and conclusion: People eat foods but not nutrients and they eat foods as meals; this holds especially true for children and adolescents. A well-calculated menu plan can assure the nutrient adequacy of an OMD where the different food and nutrient profiles of the meals complement each other in a modular system. Guidelines for meals could facilitate flexible coordination of family meals and meals in childcare centers and schools. Different meal types set varied stimulus patterns at different levels (neurocognition, emotion, digestion), which may open up long-term health benefits.
Introduction
The foundations for lifelong health are set in childhood and adolescence. A key requirement is a healthy diet from the beginning, ensuring an adequate energy supply with all the nutrients necessary for health, growth, development, and performance (1, 2). Prevention of diseases later in life, e.g., cardiovascular diseases or type 2 diabetes should be considered as well (3).
Dietary Reference Values (DRV) or Dietary Reference Intakes (DRI), reflect the scientific knowledge about the nutrient needs of the different age groups across the life cycle (4). To become understandable for the population, these nutrient values have to be translated to foods. This is the aim of the so-called Food-Based Dietary Guidelines (FBDG). Besides focusing on foods, FBDG may also take into consideration variables like tradition, dietary culture and the health status of the target groups (5). Usually FBDG inform about food groups, proportions, and general food selection. Typical examples are the 10 rules of the German Nutrition Society (www.dge.de), or the my plate system in the USA (www.choosemyplate.gov). However, in order to realistically calculate the daily nutrient intake for comparison with the nutrient references, the exact amounts of the recommended individual foods in the daily diet must be known.
The German FBDG for children and adolescents, named the Optimized Mixed Diet (OMD) (6), are based on recipes for daily meals, in which the recommended amounts of individual foods are given for certain age ranges (7, 8). The everyday nutrition practice takes place in the daily meals, thus meals provide a true-to-life foundation to quantify the usual daily food intake.
In earlier publications we have shown, that reference values for daily nutrient intake were met by the OMD seven day menu plan in all age groups of children and adolescents (6, 8). Here we show the food and nutrient profiles of the OMD meals and how the different profiles complement each other in a modular system. We discuss the advantages of this approach: 1. to ensure the nutrient adequacy of the total daily diet 2. to enable the practicability of FBDG 3. to better align FBDG with socio-cultural and physiological aspects of meal patterns (e.g., chrono-nutrition).
Procedures
Overview
The development of the OMD started with a 7-day menu comprising the usual 5 daily meals for children and adolescents in families in Germany. For an exemplary age group (4–6 years), the average nutrient intake from each of the meals was calculated and the sum of all meals per day was compared with the respective daily reference nutrient values. In this way, potential needs for optimization of food selection or food amounts became visible. Subsequently, meal-specific food and nutrient profiles were obtained (6, 7).
Foods in meals
The 7-day menu
For the 7-day menu plan, both practical and scientific criteria were considered: firstly, adhering to typical meal patterns in families in Germany that comprise 5 daily meals and can be categorized into 3 meal types: 2 cold main meals, 1 cooked meal, 2 snack meals; secondly, using primarily common nutrient-dense, non-fortified foods, to realize the full potential of their health-promoting ingredients while also identifying any need for specific nutrient fortification or supplementation, thirdly, considering the food preferences of children and adolescents. As an overarching guidance, beverages and plant foods should be consumed abundantly, foods of animal origin moderately, and high fat and high-sugar foods sparingly.
Examples
• a portion of raw or cooked vegetables or fruits with almost each meal
• cereals preferably as whole grains, breakfast cereals as a mixture of oat flakes and common non-fortified cornflakes
• water as beverage of choice (or unsweetened herbal or fruit tea) at meals and in between meals
• sugary products (so-called “tolerated” foods) limited to morning and afternoon snack at home to facilitate subsequent tooth brushing
The individual foods were grouped in nutritionally and practically useful groups, the amounts per food group and meal of the 7 days were summed and averaged per day (8) (Table 1). From the percentages of the food groups, the appropriate food group amounts for all other age groups can be calculated based on the age-specific total daily energy requirement.
Table 1. Proportion of food groups in the daily meals of the OMD.
Food profiles of the meals
In the two main cold meals (breakfast and dinner), milk or dairy products make up the highest proportions of the total meal amount. In addition, fruit or raw vegetables, as well as cereal flakes (as muesli) or a sandwich (bread) are consumed. Practical examples of cold meals are muesli of cereal, fruit and yogurt, a sausage sandwich with a glass of milk and an apple, a cheese sandwich with a raw vegetable salad or a pasta salad with tomatoes, cucumbers and yogurt dressing.
The main components of the cooked meal (typically lunch) are potatoes, rice or noodles, with plenty of vegetables, also as raw vegetable salad. A small portion of meat is on the menu about three times a week, a meal with fish once a week. On the other days, there are vegetarian dishes with pulses or cereals and vegetables as main ingredients.
The two snacks are usually eaten in the morning (e.g., as a second breakfast in the kindergarten or at school) and in the afternoon. They consist mainly of fruit or raw vegetables, bread or cereal flakes and a portion of milk or a dairy product. Occasionally, sweets, cookies or cakes are accepted.
A no-energy drink, preferably tap water, accompanies each meal and should also be available in between.
The energy percentage of the meals in the daily diet was fixed with 25% for each of the main meals (breakfast, lunch, dinner) and 12.5% for each of the two snacks. While absolute food amounts (g/d) vary with age and sex due to varying energy requirements, food group proportions (%) in the meals are independent of age (6) (Table 1).
Nutrients in meals
Calculation of nutrient intake
To calculate the energy and nutrient intake, a common software (DIAT-2020 Soft & Hard, D. Beyer, Rimbach, Germany) was used. Nutrient values were obtained from the German Food Code and Nutrient Data Base (BLS) (Bundeslebensmittelschlüssel, BLS, Version II.3), which has already repeatedly been used for nutrient intake calculations across Europe in the HELENA study (9). The BLS considers nutrient loss due to food preparation, such as cooking vegetables or frying meat.
Figure 1 shows the contribution of each of the 3 meal types to the daily intake of different nutrients in comparison to the fixed energy proportion of the respective meal types. Although the cooked meal (lunch) provides only 25% of the daily energy intake, it is relatively rich (>25% of the daily intake) in most vitamins and minerals, setting it apart from the other meals.
Figure 1. Nutrient profiles of the three meal types depicted as percentage of the daily intake (g, mg/day) as 100%.
The cold meals are especially rich in calcium and Vitamin B2, due to the preferential use of milk in these meals. The snacks show a balanced nutrient profile, which is achieved by upgrading the usual afternoon snack of sweets or cakes with the repeated use of cereals, raw vegetables and fruit.
A new perspective on meals
Role of meals
People eat foods but not nutrients and they eat foods as meals. Nutrition recommendations are usually given by FBDG in a qualitative or semi-quantitative way for the whole day or even more generally. Meals, with their different profiles, more accurately reflect the daily dietary practices and the various typical eating occasions. Beyond their typical contribution to a total healthy diet, meals provide an important setting for social gathering and for communication (10). The OMD meal is based on optimized common meals and thus could make dietary recommendations more practical and at the same time more precise to ensure adequate nutrient intake while preserving the cultural-historical variability of meals. The role of meals may go beyond the adequacy of nutrient intake, as meals are part of chronobiology of physiological and psychological processes.
Meals as a source of nutrients
The meals in a mixed diet have specific food profiles that result in specific nutrient profiles. This means that the individual meals cannot, and need not, fully reflect a healthy daily diet on their own. Finally, it is important that the meals form a modular system that completes to a daily nutrient intake that is consistent with the nutrient references.
There is no convincing evidence for a certain number of daily meals for health promotion and disease prevention (11). The OMD meal concept with 3 main meals and 2 snacks is pragmatic, but it is close to the ESPGHAN recommendations of about 4 meals per day for the prevention of childhood obesity (12).
The sequence of meals in the OMD may vary throughout the day depending on the needs of the family or child. For example, the cooked main meal provided as lunch in the OMD menus, can be exchanged for the cold main meal in the evening. The two meals during the morning (breakfast and mid-morning snack) can be interchanged for example in older children who often have a later chronotype than younger children (13) and do not feel much appetite in the morning. The OMD leaves room for such an individualized 'breakfast-combination without compromising nutrient intake (14).
The role of meals beyond nutrients
Meals are diverse by nature, thus corresponding to cultural food patterns and eating traditions, especially in rich countries. Diversity results from the different shares of food groups in the different daily meals and, in addition, from variability of the foods within a food group on different days, e.g. a cereal breakfast or a bread breakfast on two different days.
Recent work on chronobiology, pleasure of eating and long-term physical health suggests benefits of diversity between and within meals. For example, since physiological mechanisms are generally subject to diurnal regulation, it is to be expected that the time of day is also important for postprandial physiology. This may have consequences not only for wellbeing but for risk reduction and long-term health (15, 16).
Additionally, differentiated meal compositions help to anticipate and remember mealtime as a social experience and a joyful event (17, 18).
Children grow into these specific roles and meanings of meals in the family. They could probably benefit from a broader view of meals. For example, hedonistic attitudes toward food have been hypothesized to promote healthier food choices in children compared with food-related attitudes (19).
Implementation of healthy meals for children and adolescents
The breakdown of FBDG into meals to facilitate practical nutritional counseling may cover different social areas. For example, communicating healthy eating through meals could be of practical importance for children and adolescents. who eat meals outside the family in day care centers (younger children) and schools (older children, adolescents) (20).
The OMD's modular meal system shows that it is not acceptable in a mixed diet to set standardized nutrient proportions for individual meals, e.g., 1/3 of the daily nutrient references for each hot meal in day care or school, without jeopardizing the balanced daily nutrient intake of the modular system.
It is the diversity of meals that facilitates balance in daily nutrient intake. The OMD makes this possible while maintaining the meal habits in Germany. In the case of changes in meal habits (e.g., by internationalization of guidelines), adjustments could easily be made and nutrient adequacy evaluated.
Conclusion
People eat foods, but not nutrients, and they eat foods as meals. Using the example of the meals of the OMD in Germany, the results provide benchmarks for the composition of all meals of the day for children and adolescents while preserving the existing nutrition culture. Meal-Based Dietary Guidelines could facilitate the flexible coordination of family meals with daycare and school food service to achieve a balanced daily diet in a practical way. Different meal types also open up the possibility of setting varied stimulus patterns at different levels (neurocognition, emotion, digestion), which not only lead to more enjoyment when eating, but can also open up long-term health benefits.
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Author contributions
MK designed the study. MK, HK, and KS analyzed data and drafted the manuscript. TL supervised the project. All authors contributed to interpretation of the data and revisions of the manuscript.
Acknowledgments
We acknowledge support by the Open Access Publication Funds of the Ruhr-Universität Bochum.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
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Keywords: children, nutrition, Optimized Mixed Diet, nutrients, foods, meals
Citation: Kersting M, Kalhoff H, Sinningen K and Lücke T (2022) A new perspective on meals as part of an Optimized Mixed Diet for children and adolescents. Front. Nutr. 9:981587. doi: 10.3389/fnut.2022.981587
Received: 29 June 2022; Accepted: 15 August 2022;
Published: 06 September 2022.
Edited by:
Marwan El Ghoch, Beirut Arab University, LebanonReviewed by:
Owen Kelly, Sam Houston State University, United StatesCopyright © 2022 Kersting, Kalhoff, Sinningen and Lücke. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Mathilde Kersting, bWF0aGlsZGUua2Vyc3RpbmcmI3gwMDA0MDtydWhyLXVuaS1ib2NodW0uZGU=