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Digesta dynamics, nutrition messaging and (ultra)processed food
1Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, the University of Queensland, St Lucia, 4072, Queensland, Australia, m.gidley@uq.edu.au.
The Proceedings of the Nutrition Society
|August 11, 2026
Summary
Nutrient absorption and health benefits are better understood by combining nutrient composition with digesta dynamics, encompassing food processing effects. This approach reframes ultra-processed foods as marketing brands, not health determinants.
Area of Science:
- Nutritional Science
- Gastroenterology
- Food Science
Background:
- Current nutritional communication relies on nutrient composition or food type, which are insufficient.
- Nutrient content analysis overlooks absorption rates and locations.
- Food type categorization fails to distinguish variations within the same food category.
Purpose of the Study:
- To evaluate if combining nutrient composition with digesta dynamics offers a unified framework.
- To rationalize health benefits of whole foods and explain dietary risks for chronic diseases.
- To assess the impact of food processing on digesta dynamics and health outcomes.
Main Methods:
- Reviewing literature on nutrient composition and digesta dynamics.
- Analyzing key digesta dynamics parameters: chewing, gastric transit, intestinal digestion/absorption, and colonic fermentation.
- Examining the influence of food processing on these digesta dynamics.
Main Results:
- Food processing significantly alters digesta dynamics, affecting transit times and fermentation rates.
- Processing effects on digesta dynamics suggest no inherent difference between factory and kitchen-processed foods.
- Digesta dynamics provide a coherent explanation for health impacts, independent of processing methods.
Conclusions:
- A framework integrating nutrient composition and digesta dynamics is essential for accurate nutrition messaging.
- Focusing on digesta dynamics can prevent the misattribution of health risks to food additives.
- Ultra-processed foods should be viewed as a marketing category, not a scientific health classification.
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