Until the 1900s , yoghurt was eaten all the time by people in the Russian Empire ( and especially Central Asia and the Caucasus ) , Western Asia , South Eastern Europe\/Balkans , Central Europe , and India . Until the 1900s , yoghurt was a staple in diets of people in the Russian Empire ( and especially Central Asia and the Caucasus ) , Western Asia , South Eastern Europe\/Balkans , Central Europe , and India .