Big brains needed carbs—The importance of dietary carbohydrate in human evolution

Understanding how and why we evolved such large brains is one of the most puzzling issues in the study of human evolution. It is widely accepted that brain size increase is partly linked to changes in diet over the last 3 million years, and increases in meat consumption and the development of cooking have received particular attention from the scientific community. In a new study published in The Quarterly Review of Biology, Dr. Karen Hardy and her team bring together archaeological, anthropological, genetic, physiological and anatomical data to argue that carbohydrate consumption, particularly in the form of starch, was critical for the accelerated expansion of the human brain over the last million years, and coevolved both with copy number variation of the salivary amylase genes and controlled fire use for cooking.

With global increase in obesity and diet-related metabolic diseases, interest has intensified in ancestral or 'Palaeolithic' diets, not least because - to a first order of approximation - human physiology should be optimized for the nutritional profiles we have experienced during our evolution. Up until now, there has been a heavy focus on the role of animal protein and cooking in the development of the human brain over the last 2 million years, and the importance of carbohydrate, particular in form of starch-rich plant foods, has been largely overlooked.

Hardy's team highlights the following observations to build a case for dietary carbohydrate being essential for the evolution of modern big-brained humans:

(1) The uses up to 25% of the body's energy budget and up to 60% of blood glucose. While synthesis of glucose from other sources is possible, it is not the most efficient way, and these high glucose demands are unlikely to have been met on a low carbohydrate diet;

(2) Human pregnancy and lactation place additional demands on the body's glucose budget and low maternal blood glucose levels compromise the health of both the mother and her offspring;

(3) Starches would have been readily available to ancestral human populations in the form of tubers, as well as in seeds and some fruits and nuts;

(4) While raw starches are often only poorly digested in humans, when cooked they lose their crystalline structure and become far more easily digested;

(5) Salivary amylase genes are usually present in many copies (average ~6) in humans, but in only 2 copies in other primates. This increases the amount of salivary amylase produced and so increases the ability to digest starch. The exact date when salivary amylase genes multiplied remains uncertain, but genetic evidence suggests it was at some point in the last 1 million years.

Hardy proposes that after cooking became widespread, the co-evolution of cooking and higher copy number of the salivary amylase (and possibly pancreatic amylase) genes increased the availability of pre-formed dietary glucose to the brain and fetus, which in turn, permitted the acceleration in brain size increase which occurred from around 800,000 years ago onwards.

Eating meat may have kick-started the evolution of bigger brains, but cooked starchy foods together with more genes made us smarter still.

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More information: Karen Hardy, Jennie Brand Miller, Katherine D. Brown, Mark G. Thomas, and Les Copeland. "The Importance of Dietary Carbohydrate in Human Evolution." The Quarterly Review of Biology: September 2015.
Journal information: Quarterly Review of Biology

Citation: Big brains needed carbs—The importance of dietary carbohydrate in human evolution (2015, August 6) retrieved 20 July 2019 from
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Aug 07, 2015
The nutrient-dependent RNA-mediated gene duplication that leads to copy number variation is biophysically constrained by receptor-mediated behaviors. The de novo creation of more receptors helps to ensure fixation of RNA-mediated amino acid substitutions in cell types that ensure successful reproduction in all organisms of all living genera.

That's how 1) the epigenetic landscape is linked to the physical landscape of DNA; 2) nutrient-dependent metabolic networks are linked to genetic networks and how 3) ecological variation leads to ecological adaptations.

1,2, & 3 require changes in morphological and behavioral phenotypes during life history transitions, and all changes are nutrient-dependent. There is no such thing as co-evolution of _____ and genes, because genes do not evolve.

It is widely accepted that brain size increase is partly linked to changes in diet over the last 3 million years...
-- by biologically uninformed theorists.

Aug 07, 2015
Conclusion: "We have demonstrated an approach that can serve as a useful first step in exploring the heterogeneous processes involved in genome evolution, including ILS, hybridization, and gene and genome duplications. Nevertheless... Without exploring the underlying processes and patterns that underlie these data, significant evolutionary events are ignored."

My comment: The ecological variation that links nutrient-dependent RNA-mediated gene duplication and the physiology of reproduction to cell type differentiation in all genera via the biophysically constrained chemistry of protein folding and fixation of the amino acid substitutions that determine cell types in all living genera has been ignored. Simply put, genes don't EVOLVE!

Genes represent the accumulation of epigenetic effects that link metabolic networks to genetic networks via nutrient-dependent RNA-mediated gene duplication and reproductive physiology.

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