Unrefined plant foods typically have an abundance of fiber.
Dairy products, eggs, and meat all have this in common – they contain no fiber. Refined grain products also have most of the dietary fiber removed from them.
So, a diet high in animal products and refined grains (a typical diet in the USA) is low in fiber.
In prospective health studies low fiber was not found to be a risk for breast cancer.
It is possible that fiber measurements are just a surrogate measure for unrefined plant food intake.
Slattery et al found an inverse correlation between vegetable, fruit and whole grain intake plant food intake and rectal
cancer, while refined grains were associated with increased risk of rectal cancer.
A threshold of about 5 daily servings of vegetables was needed to reduce cancer risk and the effect was stronger among older subjects.
Many other nutrients are co-variants with fiber, including folic acid, which is covered in detail below.
Unrefined plant foods typically have an abundance of fiber. Dairy products, eggs, and meat all have this in common – they contain no fiber. Refined grain products also have most of the dietary fiber removed from them. So, a diet high in animal products and refined grains (a typical diet in the USA) is low in fiber. In prospective health studies low fiber was not found to be a risk for breast cancer. It is possible that fiber measurements are just a surrogate measure for unrefined plant food intake. Slattery et al found an inverse correlation between vegetable, fruit and whole grain intake plant food intake and rectalcancer, while refined grains were associated with increased risk of rectal cancer.A threshold of about 5 daily servings of vegetables was needed to reduce cancer risk and the effect was stronger among older subjects.Many other nutrients are co-variants with fiber, including folic acid, which is covered in detail below.
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