Very important, most people don't know about that. The way that bread used to be fermented over a day or two, now most bread is only fermented for an hour or two. Eating the bread on the grocery store shelf is bad and most people don't realize this. I feel like absolute crap whenever I would have that stuff.

But a good old fashioned sourdough bread that was fermented properly was perfect. Its hard to find that stuff, only some places have a small selection of it.

Better off making it yourself :)