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Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
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Nutrient density: principles and evaluation tools.

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Nutrient profiling models, like the Nutrient-Rich Foods (NRF) index, help classify foods based on nutritional value. The NRF9.3 model effectively identifies nutrient-dense foods, supporting healthier dietary guidelines.

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Area of Science:

  • Nutritional Science
  • Dietary Assessment
  • Public Health Nutrition

Background:

  • Nutrient profiling classifies foods by nutritional value, defining nutrient-dense foods as those high in nutrients relative to calories.
  • Effective nutrient profile models require transparency, accessible data, and validation against independent healthy diet measures.
  • The Nutrient-Rich Foods (NRF) models were developed adhering to rigorous scientific standards.

Purpose of the Study:

  • To develop and validate nutrient profile models for classifying foods based on their nutritional density.
  • To establish a transparent and scientifically validated method for assessing food's nutritional quality.
  • To inform dietary recommendations and consumer education programs.

Main Methods:

  • Developed the Nutrient-Rich Foods (NRF) family of nutrient profile models, incorporating nutrients to encourage and limit.
  • Validated model performance against the Healthy Eating Index (HEI) using NHANES data.
  • Compared models based on different metrics (100 g, 100 kcal, serving size) and calculation methods (ratios, sums, means).

Main Results:

  • Models based on 100 kcal and serving sizes outperformed those based on 100 g.
  • Formulas using sums and means demonstrated superior performance compared to ratios.
  • The final NRF9.3 index, based on 9 beneficial nutrients and 3 to limit, showed higher scores correlated with lower energy density and more nutrient-rich diets.

Conclusions:

  • The NRF9.3 index is a validated tool for assessing food nutrient density.
  • Nutrient profiling, particularly using models like NRF9.3, can be a foundation for dietary guidelines.
  • Combining nutrient density assessment with consumer education can promote healthier eating patterns.