Dietary guidelines for serving sizes of food groups
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Food-Based Dietary Guidelines and Food Group Serving Sizes
Food-based dietary guidelines (FBDGs) are designed to help people eat a healthy, balanced diet by recommending specific amounts of different food groups. These guidelines often use serving sizes to make recommendations clear and practical for consumers 1234+2 MORE.
Standardization and Variation in Serving Size Recommendations
Global Differences and Consistency
There is significant variation in serving size recommendations for food groups across countries and regions. For example, Europe tends to recommend larger portion sizes for meat, fish, and pulses, while the Near East recommends larger dairy portions, and Africa recommends larger grain-based food portions. However, recommendations for fruits and vegetables are more consistent worldwide 235.
Despite these differences, studies show that for most food groups, portion size recommendations are generally consistent across regions, with only a few exceptions such as fish and shellfish . This suggests that harmonizing serving size recommendations globally is possible and could help provide clearer guidance to consumers 456.
Methods for Defining Serving Sizes
Serving sizes are determined using various methods, including:
- Household measurements converted to grams (for fruits, vegetables, fats, and oils)
- Nutrient-based calculations (e.g., dairy servings based on calcium content, protein foods based on recommended protein intake)
- Calorie-based portions for snacks and discretionary foods 146
Some countries use local food consumption surveys, while others rely on consensus or review by experts. The lack of a standardized approach leads to inconsistencies in serving size recommendations 35.
Example Standardized Portion Sizes
Efforts to standardize serving sizes have produced global portion values (GPVs) for common food groups, such as:
- Milk: 240 mL
- Cheese: 30 g
- Meat/poultry/fish (main dish): 90 g
- Bread/rolls: 50 g
- Canned vegetables: 130 g
- Chocolate: 30 g
- Soft drinks: 250 mL 46
These standardized values are based on the median of various data sources, including regulated serving sizes, FBDGs, and actual food intake data, and show high consistency for most food groups 46.
Challenges in Serving Size Guidance
Consumer Understanding and Compliance
Many people have difficulty understanding and following serving size recommendations. Studies in Saudi Arabia found that less than half of mothers could correctly identify food groups or serving sizes, and nutrition knowledge was generally low, especially among those with lower education or income 78. This highlights the need for better nutrition education and clearer communication of serving sizes.
Special Populations
Older adults in residential care often receive and consume less than the recommended serving sizes for core food groups, leading to inadequate energy and protein intake. This suggests that serving size guidelines may need to be adapted for vulnerable populations, focusing on smaller, nutrient-dense meals .
Conclusion
Serving sizes in dietary guidelines are essential for helping people achieve a balanced diet, but there is considerable variation in recommendations across countries and food groups. Standardized approaches to defining serving sizes are emerging and show promise for improving consistency and clarity. However, challenges remain in consumer understanding and in meeting the needs of specific populations. Continued efforts to harmonize serving size recommendations and improve nutrition education are important for supporting healthy eating worldwide.
Sources and full results
Most relevant research papers on this topic
Food Based Dietary Guidance - Weighing up the recommendations
This study developed serving sizes for 1,276 foods, enabling automatic assessment of compliance to Food-Based Dietary Guidelines, improving health advice for healthcare and food industry professionals.
A global analysis of portion size recommendations in food-based dietary guidelines
Food-Based Dietary Guidelines show variation in portion size recommendations, with Fruits and Vegetables showing the highest consistency worldwide, but inconsistent definitions and derivation methods contribute to discrepancies.
Portion Size Recommendations in Food-Based Dietary Guidelines: A Global Review of the Methods
Food-based dietary guidelines show wide variability in portion size recommendations, highlighting the need for a global methodological framework to harmonise reference portions.
Method to define recommended portion sizes for consumer guidance
This study developed a standardized method to establish globally consistent portion size recommendations for 50 food groups, aiding consumers in making informed choices about appropriate portion sizes.
Method to develop globally relevant portion sizes for nutrient-dense and discretionary foods
This study developed a method to create globally relevant portion size recommendations for both nutrient-dense and discretionary foods, potentially improving consistency in portion labeling and guiding consumers to more appropriate portion sizes.
Knowledge Status of Dietary Guidelines and Portion Sizes in Saudi Arabian Mothers; A Cross-Sectional Study
Saudi Arabian mothers' knowledge of dietary guidelines and portion sizes is poor, with 29.1% aware of MyPlate guidelines and 51.5%) affected by healthy plate choices.
Knowledge of dietary guidelines and portion sizes in Saudi Arabian mothers; cross-sectional study
Saudi Arabian mothers' knowledge of dietary guidelines and portion sizes is poor, highlighting the need for nutrition education and targeting sociodemographic groups like low income, lower education, and unmarried women.
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An investigation of recommended serve food portions and attaining energy and protein requirements in older adults living in residential care.
Smaller, nutrient-dense meals and revised menu standards are needed to ensure nutritional adequacy in older adults living in residential care.
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