It is amazing how four simple ingredients--flour, water, yeast and salt (plus time and patience)--can produce such a nutritious and flavorful food that human beings have consumed since thousands of years ago.
This is my first time using rye to make bread. Rye is very different from wheat. Although rye flour has similar gluten producing proteins, there is virtually no gluten formation. It has more bran, mineral, fiber, soluble sugars, pentosans, and amylase enzymes than wheat flour. All these differences make baking with rye a bit challenging. In particular, amylase will cause the bread crumb to have more of a gummy texture in a process called "starch attack" (I am not going to go into details here. For more information, read Hamelman's book, Bread, p40-42)