I have read that the organisms in starter are actually supposed to be good for your digestive system. I always assumed that meant when you eat a piece of bread with it, but now that I am thinking about it wouldn't all the bacteria etc. be dead and unable to do you any good with baked bread?
OT - kinda
We are really drifting into the realm of probiotics here. They are available in capsule form in most health food stores and probably Whole Foods.
Cultured milk products like yogurt, real sour cream, kefir, and some cultured cheeses contain plenty of probiotics. In the book Nourishing Traditions
Sally Fallon advocated cultured milk products over plain milk. The way it has been consumed for thousands of years.
Cutlured vegetables like sauerkraut and kimchee also contain plenty of probiotics.
As for the culture, it probably is good for you, but after tasting it, I would rather eat yogurt or a proper sauerkraut.
As for cooking any cultured food, most if not all of the beneficial organisms are destroyed.