Historically, sourdough bread is important because it can be traced back to the ancient Egyptian civilisations of around 3000 BC. It is also important because sourdough bread is actually more nutritious than the grain from which it is made. This is because sourdough helps to release the nutrients and minerals present in the bread, making them easier to digest and more accessible for the body. Most of all though, sourdough improves the taste and flavour of bread.