The Milk Enzyme

£14.99
Author: 
Synopsis: 

Before the 1960s it was assumed that all adult Homo sapiens had an abundance of the enzyme lactase (which hydrolyses the milk sugar – lactose) in the enterocytes (the cells lining the small-intestine) (PL). This conclusion was probably reached because only Europeans had been studied. It became clear, largely as a result of investigations in Uganda (outlined in this book), that the accepted status quo was incorrect, and that most adult H sapiens worldwide, like most (probably all) other mammals, have very low lactase concentrations (hypolactasia).
Mapping of lactase in adult population groups therefore became a valuable physical anthropological ‘marker’. Whether this also had nutritional implications in infancy still awaits an answer.
Further work (also outlined in this book) indicated that persistence of the lactase gene (PL) had originated either in east Africa, or, more likely, somewhere in the Middle-east. Research presently in progress – using sophisticated genetic techniques – is taking this matter further.

ISBN: 
9781910792797
Published: 
27 Jun 2016
Pages: 
130
Binding: 
Hardback
Category: 
Biography

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