Technological food has led to the fact that modern man is simply chronically ill. He has allergies, heart disease, depression, chronic fatigue, apathy, ongoing intoxication, he is teetering on the brink of developing diabetes and oncology and eventually goes there. And once upon a time, a long time ago, a century in Rus' was called the average life expectancy. That is, living for at least a hundred years was normal, in the order of things. What is the secret here? The cuisine of our ancestors was based on one simple component - rye sourdough. Not only bread, but also many other dishes were prepared on it. Why rye sourdough? Because it has a special power. A power of unknown origin, because it has not been explored, is forgotten. But you can feel it if you try the recipes from this book.