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Whole grain

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A whole grain is a complete seed from a cereal or a pseudocereal. It is defined by having all three of its original anatomical parts. These parts are the bran, the germ, and the starchy endosperm. In many processed foods, people eat refined grains instead. Refined grains are different because manufacturers remove the bran and the germ. This leaves only the endosperm, which is the starchy middle part. To be truly whole grain, the parts must stay in the same relative proportions as they exist in the intact kernel.

Wheat-kernel nutrition
Wheat-kernel nutrition

The structure of the grain determines its nutritional value. The bran is the outer layer, and the germ is the embryo. The endosperm provides the starch. When these parts are kept together, the grain provides carbohydrates, dietary fiber, and multiple nutrients. However, the process of milling can change how we use these grains. For example, in Canada, regulations allow up to 5% of the kernel to be removed. This is done to reduce rancidity and make the flour last longer on the shelf. If this portion is removed, the flour is no longer considered a whole grain.

There are many distinct types of whole grains available. Cereal grains include common staples like wheat, rice, and maize, which is also called corn. Wheat has many varieties, such as spelt, emmer, farro, einkorn, Kamut, and durum. Rice can be found in many colors, including black, brown, and red. Other cereals include barley, rye, and oats. There are also minor cereals like millet, sorghum, teff, and triticale. Some grains, like wild rice, are also included in this group.

Wheat-kernel nutrition
Wheat-kernel nutrition

Beyond traditional cereals, there is a group called pseudocereals. These are plants that are used like grains but are not botanically cereals. Examples include amaranth, buckwheat, and quinoa. These are very important because of their protein quality. Most cereal proteins are considered low quality because they lack enough lysine. Lysine is an essential amino acid that the body needs. If one essential amino acid is missing, the others can break down and be excreted. This is a major concern during periods of physical growth. However, pseudocereals like quinoa and amaranth have high nutritional value. Their protein quality is close to casein, which is the main protein found in milk.

Many health organizations study the effects of whole grains on the human body. Consumption is often associated with a lower risk of several diseases. For instance, the American Institute for Cancer Research states there is strong evidence that whole grains decrease the risk of colorectal cancer. Some studies also suggest whole grains may lower the risk of type 2 diabetes, stroke, and coronary heart disease. They may also lower all-cause mortality. Regular consumption can lower levels of LDL and triglycerides, which are risk factors for cardiovascular diseases. However, some scientific bodies are more cautious. The European Food Safety Authority has stated that a cause-and-effect relationship between whole grains and certain health effects has not been fully established. In 2012, Health Canada also noted that evidence was insufficient to support a specific claim about coronary heart disease risk reduction.

While grains are healthy for many, they can cause issues for specific people. Wheat, barley, rye, and oats contain a protein called gluten. In people with a genetic susceptibility, gluten can trigger coeliac disease. This condition affects about 1% of the population in developed countries. People with coeliac disease must follow a strict, lifelong gluten-free diet. There are other conditions too, such as non-coeliac gluten sensitivity, which affects between 0.5% and 13% of people. Other related issues include gluten ataxia and dermatitis herpetiformis. For these individuals, pseudocereals like quinoa are often a useful alternative.

It is important to know how to identify real whole grains in a grocery store. In the United States, you must look at the ingredients list. A product might list "wheat flour" first, but that does not mean it is whole grain. If a label lists two grain products but only the second one is labeled "whole grain," the product might only contain 1% to 49% whole grain. Some breads are even colored brown with molasses or caramel to look like whole grain. In the United Kingdom, the legally protected term is "wholemeal" rather than "wholegrain." Understanding these labels helps people ensure they are getting the fiber and nutrients they expect.

Wheat-kernel nutrition
Wheat-kernel nutrition
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