Human
ancestors may have begun evolving the knack for consuming alcohol about 10
million years ago, long before modern humans began brewing booze, researchers
say.
The
ability to break down alcohol likely helped human ancestors make the most out
of rotting, fermented fruit that fell onto the forest floor, the researchers
said. Therefore, knowing when this ability developed could help researchers
figure out when these human ancestors began moving to life on the ground, as
opposed to mostly in trees, as earlier human ancestors had lived.
"A
lot of aspects about the modern human condition - everything from back pain to
ingesting too much salt, sugar and fat - goes back to our evolutionary
history," said lead study author Matthew Carrigan, a paleogeneticist at
Santa Fe College in Gainesville, Florida. "We wanted to understand more
about the modern human condition with regards to ethanol," he said,
referring to the kind of alcohol found in rotting fruit and that's also used in
liquor and fuel.
To
learn more about how human ancestors evolved the ability to break down alcohol,
scientists focused on the genes that code for a group of digestive enzymes
called the ADH4 family. ADH4 enzymes are found in the stomach, throat and
tongue of primates, and are the first alcohol-metabolizing enzymes to encounter
ethanol after it is imbibed.
Read more at http://www.livescience.com/48958-human-origins-alcohol-consumption.html