Pumpernickel bread had four to eight times as much resistant starch as breads made with wheat or barley| Reader's Digest

Put Pumpernickel in Your Diet | Reader's Digest

Aids Digestion

One Canadian study found that pumpernickel bread had four to eight
times as much resistant starch as breads made with wheat or barley.
Resistant starch benefits blood sugar because it doesn’t digest easily.
Like dietary fibre, it travels right past the stomach and small
intestine and settles in the colon, where it’s broken down by bacteria
and eventually expelled.

Beware Imitations

Not all store-bought pumpernickels have the same benefits as
traditional German pumpernickel, though. Many get their dark colour from
molasses, not from whole rye kernels and a special baking process that
takes many hours. These types usually contain more wheat flour than rye,
and some are made using yeast instead of sourdough starter.