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Energetic and nutritional constraints on infant brain development: implications for brain expansion during human
Stephen C Cunnane1, Michael A Crawford2
1Research Center on Aging, Departments of Medicine and Physiology & Biophysics, Université de Sherbrooke, Sherbrooke, Québec, Canada.
Journal of Human Evolution
|June 15, 2014
Summary
Human brain evolution was shaped by energy needs and nutrient access. A unique fetal fat layer and a shore-based diet provided essential fatty acids and minerals, overcoming these developmental constraints.
Area of Science:
- Evolutionary biology
- Neuroscience
- Nutritional science
Background:
- Human brain development faces high energy demands and requires specific nutrients.
- These energetic and nutritional needs were also critical constraints during human brain evolution.
- Inadequate nutrient supply continues to impact brain development globally.
Purpose of the Study:
- To explore how early hominins overcame energetic and nutritional constraints on brain development.
- To investigate the role of a unique fetal fat layer and a shore-based diet in human brain evolution.
Main Methods:
- The study proposes a "shore-based paradigm" for human brain evolution.
- It analyzes the energetic and nutritional contributions of body fat and diet.
- It reviews the importance of specific nutrients like docosahexaenoic acid (DHA), iodine, and iron.
Main Results:
- A significant fetal fat layer evolved in hominins, providing energy (ketones) and docosahexaenoic acid (DHA) for the developing brain.
- A shore-based diet rich in fish, mollusks, and aquatic plants offered crucial brain-selective nutrients.
- Access to these resources likely surmounted key energetic and nutritional barriers to primate brain development.
Conclusions:
- The evolution of a specialized fetal fat layer and a nutrient-rich shore-based diet were pivotal for human brain evolution.
- These adaptations addressed both the high energy requirements and specific nutritional needs of the brain.
- Understanding these evolutionary pressures highlights the ongoing vulnerability of brain development to nutrient availability.
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