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Area of Science:

  • Nutrition Science
  • Public Health
  • Epidemiology

Background:

  • Current definitions of "whole grains" and "ultraprocessed food" lack precision for disease prevention.
  • The health benefits of whole grain consumption require further clarification regarding confounding lifestyle factors and specific food types.

Purpose of the Study:

  • To discuss three key issues in whole grain consumption and non-communicable disease (NCD) prevention: food classification, confounding lifestyle choices, and distinct physiological benefits of different whole grains.
  • To highlight the need for standardized classification of whole grain foods for accurate public health recommendations.

Main Methods:

  • Analysis of 12 major prospective cohorts with over 100,000 participants assessing whole grain intake.
  • Examination of inconsistencies in the classification and reporting of whole grain foods across studies.
  • Review of physiological effects, such as postprandial glucose response, related to whole grain processing and type.

Main Results:

  • Significant inconsistency exists in identifying "whole grain" foods across major cohorts, with only three common to most.
  • Health benefits attributed to whole grains may be partially explained by healthier lifestyle choices of consumers (e.g., less smoking, more exercise).
  • The degree of processing and type of whole grain significantly influence physiological effects, like glycemic response.

Conclusions:

  • Standardized classification of whole grain foods is crucial for effective NCD prevention strategies.
  • Further research into the specific physiological effects of different whole grains and their processing is needed for clinical and public health applications.
  • Observed benefits of whole grain consumption may be influenced by confounding lifestyle factors, necessitating careful consideration in research and recommendations.