A grain is considered to be a whole grain as long as all three original parts — the bran, germ, and endosperm — are still present in the same proportions as when the grain was growing in the fields.
The Bran
The bran is the multi-layered outer skin of the edible kernel. It contains important antioxidants, B vitamins and fiber.
The Germ
The germ is the embryo which has the potential to sprout into a new plant. It contains many B vitamins, some protein, minerals, and healthy fats.
The Endosperm
The endosperm is the germ’s food supply, which provides essential energy to the young plant so it can send roots down for water and nutrients, and send sprouts up for sunlight’s photosynthesizing power. The endosperm is by far the largest portion of the kernel. It contains starchy carbohydrates, proteins and small amounts of vitamins and minerals.
What’s a “Refined Grain?” An “Enriched Grain?”
“Refined grain” is the term used to refer to grains that are not whole, because they are missing one or more of their three key parts (bran, germ, or endosperm). White flour and white rice are refined grains, for instance, because both have had their bran and germ removed, leaving only the endosperm. Refining a grain removes about a quarter of the protein in a grain, and half to two thirds or more of a score of nutrients, leaving the grain a mere shadow of its original self.
Since the late 1800s, when new milling technology allowed the bran and germ to be easily and cheaply separated from the endosperm, most of the grains around the world have been eaten as refined grains. This quickly led to disastrous and widespread nutrition problems, like the deficiency diseases pelagra and beri-beri.
In response, many governments recommended or required that refined grains be “enriched.” Enrichment adds back fewer than a half dozen of the many missing nutrients, and does so in proportions different than they originally existed. The better solution is simply to eat whole grains, now that we more fully understand their huge health advantages.
The chart below compares whole wheat flour to refined wheat flour and enriched wheat flour. You can see the vast difference in essential nutrients.
Whole Wheat vs. Whole Grain – What’s the Difference?
We get asked regularly, “What is the difference between whole wheat and whole grain?” Our answer is another question: “What is the difference between a carrot and a vegetable?”
Everyone knows that all carrots are vegetables but not all vegetables are carrots. It’s similar with whole wheat and whole grain: Whole wheat is one kind of whole grain, so all whole wheat is whole grain, but not all whole grains are whole wheat.
If you’re reading this in Canada, be aware that Canada has a unique regulatory situation in regards to whole wheat flour. Canada allows wheat flour to be called “whole wheat” even when up to 5% of the original kernel is missing. So in Canada you’ll hear two terms used:
- Whole Wheat Flour in Canada — contains at least 95% of the original kernel
- Whole Grain Whole Wheat Flour in Canada — contains 100% of the original kernel
“Whole grain whole wheat flour” would be redundant in the U.S.A. — whole wheat flour is always whole grain in the States. But not in Canada, so be aware.
