If there is one food you should eat even
though it pushes the upper limit of
glycemic load, it's All-Bran cereal. It is
by far the best source of insoluble fiber
in the Western diet. In fact, it is
difficult to get enough of that kind of
fiber without eating bran.
There are two kinds of fiber, soluble and
insoluble. While there is plenty of soluble
fiber in fruits and vegetables, insoluble
fiber is hard to come by.
In addition to meat, our ancestors ate
crude vegetation--grass, bark, roots and
unripened fruit and berries--which
contained large amounts of insoluble fiber.
Over the millenia, we humans have refined
most of the insoluble fiber out of our
diet. However, it is essential for good