Dear Lactnet Friends:

Reprod Biol Endocrinol. <http://www.ncbi.nlm.nih.gov/pubmed/21798047#> 2011
Jul 28;9(1):101. [Epub ahead of print]
Different effects of hyperlipidic diets in human lactation and adulthood:
growth versus the development of obesity.
Alemany M<http://www.ncbi.nlm.nih.gov/pubmed?term=%22Alemany%20M%22%5BAuthor%5D>
.
 Abstract

ABSTRACT: After birth, the body shifts from glucose as primary energy
substrate to milk-derived fats, with sugars from lactose taking a secondary
place. At weaning, glucose recovers its primogeniture and dietary fat role
decreases. In spite of human temporary adaptation to a high-fat (and sugars
and protein) diet during lactation, the ability to thrive on this type of
diet is lost irreversibly after weaning. We could not revert too the
lactating period metabolic setting because of different proportions of brain
/ muscle metabolism in the total energy budget, lower thermogenesis needs
and capabilities, and absence of significant growth in adults. A key reason
for change was the limited availability of foods with high energy content at
weaning and during the whole adult life of our ancestors, which
physiological adaptations remain practically unchanged in our present-day
bodies. Humans have evolved to survive with relatively poor diets
interspersed by bouts of scarcity and abundance. Today diets in many
societies are largely made up from choice foods, responding to our deeply
ingrained desire for fats, protein, sugars, salt etc. Consequently our diets
are not well adjusted to our physiological needs/adaptations but mainly to
our tastes (another adaptation to periodic scarcity), and thus are rich in
energy roughly comparable to milk. However, most adult humans cannot process
the food ingested in excess because our cortical-derived craving overrides
the mechanisms controlling appetite. This is produced not because we lack
the biochemical mechanisms to use this energy, but because we are unprepared
for excess, and wholly adapted to survive scarcity. The thrifty mechanisms
compound the effects of excess nutrients and damage the control of energy
metabolism, developing a pathologic state. As a consequence, an overflow of
energy is generated and the disease of plenty develops.

-- 
Nikki Lee RN, BSN, Mother of 2, MS, IBCLC, CCE, CIMI, ANLC, CKC
craniosacral therapy practitioner
www.breastfeedingalwaysbest.com

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