Current article in Nature on milk

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Registered: 07-11-2006
Current article in Nature on milk
Wed, 07-31-2013 - 8:44pm

"Young children almost universally produce lactase and can digest the lactose in their mother's milk. But as they mature, most switch off the lactase gene. Only 35% of the human population can digest lactose beyond the age of about seven or eight..."

http://www.nature.com/news/archaeology-the-milk-revolution-1.13471

Is this evidence that it is biologically important for children to be able to nurse until 7 or 8 years of age?