Dante Carrillo
Grains have become a common target for exclusion diets, with many people blaming them for health problems. Whole grains are a good source of dietary fibre, which is lacking in the diets of many Americans. Whole grains contain the bran and germ of the grain, which are rich in fibre and nutrients. Refined grains, on the other hand, have had the bran and germ removed, leaving only the high-carb endosperm. This process removes dietary fibre, iron, and B vitamins. While some of these vitamins and iron are often added back, fibre typically is not. Whole grains have been linked to health benefits such as improved digestion, lower risks of heart disease, and reduced cholesterol levels.
| Characteristics | Values |
|---|---|
| Whole grains | High in fiber |
| Refined grains | Low in fiber |
| Grain-free diet | May be low in fiber unless other foods like fruits, vegetables, beans, or lentils are included |
| Whole grains | A good source of dietary fiber |
| Refined grains | Contain little or no fiber |
| Bran | The hard outer layer of the grain that contains fiber |
| Germ | The nutrient-rich core of the grain that contains fiber |
| Endosperm | The largest part of the grain that contains mostly carbs and protein |
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What You'll Learn
Whole grains are a good source of fiber
Fiber from whole grains has several health benefits. Firstly, it helps to reduce blood cholesterol levels, which may lower the risk of heart disease. Secondly, fiber can aid in weight management by promoting a feeling of fullness and supporting healthy digestion. Thirdly, fiber may help prevent the formation of small blood clots that can trigger heart attacks or strokes.
The American Heart Association recommends choosing whole grains and products that contain at least 51% whole grains over refined grains. Refined grains, such as those found in white bread, white pasta, and many processed foods, have been milled to remove the bran and germ, resulting in a loss of dietary fiber, iron, and B vitamins. This leads to faster digestion and a spike in blood sugar levels.
To incorporate more whole grains into your diet, opt for brown rice, barley, oats, corn, and rye. These grains are healthy choices as they provide the nutritional benefits of whole grains without any additional ingredients. Additionally, look for the Whole Grain Stamp on food products, which indicates a higher fiber content and lower sodium and trans-fat content. However, be mindful that products with the Whole Grain Stamp may be higher in sugar and calories than those without it.
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Refined grains lack fiber
Whole grains are a good source of nutrients, particularly fiber, B vitamins, iron, magnesium, phosphorus, manganese, and selenium. However, refined grains, such as those found in white bread, white pasta, and many other processed foods, are devoid of fiber. This is because they have been milled, a process that removes the bran and germ to give grains a finer texture and improve their shelf life. While some B vitamins and iron are often added back to refined grains, fiber might not be, meaning refined grains contain little to no fiber.
Fiber is important for human health as it helps to reduce blood cholesterol levels and may lower the risk of heart disease. It is also important for proper bowel function. Whole grains are a good source of fiber, and eating whole grain foods that are rich in fiber can support healthy digestion and may help with weight management.
Refined grains, on the other hand, are digested very quickly, generally causing a spike in blood sugar levels shortly after a meal. This can be problematic for people with diabetes or metabolic syndrome. While cutting out all grains may help lower blood sugar levels, it is not the only way, and fiber-rich whole grains may help stabilize and prevent spikes in blood sugar levels.
The American Heart Association recommends choosing whole grains and products that contain at least 51% whole grains over refined grains. To identify whole grains, look for "100% whole wheat" or other whole grains as the first ingredient on the ingredients list. Common varieties of whole grains include wheat, barley, brown rice, buckwheat, corn, rye, oats, and wild rice.
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Fiber-rich grains aid digestion
Whole grains are a great source of dietary fibre, which is essential for healthy digestion. Fibre is a nutrient lacking in many people's diets, with 90% of women and 97% of men not achieving the recommended daily intake of 25-35g. Fibre-rich whole grains include wheat, quinoa, wild rice, muesli, and more.
Whole grains contain the bran and germ of the grain, which are the parts that provide fibre and important nutrients. Refined grains, on the other hand, have had these parts removed, leaving only the high-carb endosperm. This process gives refined grains a finer texture and improves their shelf life, but it also strips them of fibre and beneficial plant compounds. Examples of refined grains include white flour, white bread, white pasta, and white rice.
The American Heart Association recommends choosing whole grains over refined grains and suggests including at least three fibre-rich whole grains in your daily diet. Eating whole grains can provide several health benefits, including improved digestion, reduced risk of heart disease, stroke, and type 2 diabetes, and lower blood cholesterol levels. Fibre is also important for weight management, as it helps you feel full and satisfied with fewer calories.
While grain-free diets have become popular, they can lead to nutrient deficiencies, especially in fibre, B vitamins, iron, and trace minerals. It is important to note that unnecessarily following a grain-free diet may do more harm than good. If you are considering a grain-free diet, it is recommended to consult with a registered dietitian to ensure you are meeting your nutrient needs through other food sources.
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Fiber helps manage blood sugar
Grains are a good source of dietary fibre, especially whole grains. Whole grains are a good source of nutrients, including complex carbohydrates, dietary fibre, several B vitamins, and minerals such as iron, magnesium, and selenium. Refined grains, on the other hand, are devoid of fibre as they have been milled, a process that removes the bran and germ to give them a finer texture and improve shelf life.
Fibre is a type of carbohydrate found mainly in fruits, vegetables, whole grains, and legumes. It is an essential part of a healthy diet, offering a range of health benefits, including the prevention and management of diabetes. Fibre helps control blood sugar levels by slowing down digestion. This is because the human body cannot absorb or break down fibre, meaning it does not cause a spike in blood sugar in the way that other carbohydrates can. Fibre-rich foods stay in the stomach for longer, keeping you feeling full for longer.
Soluble fibre dissolves in water and forms a gel-like substance in the stomach, which helps to control blood sugar and cholesterol levels. Insoluble fibre, often referred to as "roughage", does not dissolve in water and remains intact as it passes through the gastrointestinal tract. It helps increase insulin sensitivity and keeps your bowels healthy.
It is important to note that a sudden increase in fibre can lead to digestive discomfort, so it is recommended to increase fibre intake gradually and drink plenty of water to help food move through the system.
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Fiber is important for heart health
A grain-based diet can be a good source of fiber, depending on the type of grains consumed. Whole grains, such as oats, barley, and wild rice, are rich in dietary fiber, while refined grains, such as white bread, white pasta, and white rice, have been milled and stripped of their bran and germ, resulting in a loss of fiber content.
Fiber is indeed important for heart health, and this understanding is supported by a growing body of evidence. Firstly, fiber helps to lower blood pressure and cholesterol levels. This is achieved through the breakdown of prebiotic fiber by bacteria in the colon, which produces short-chain fatty acids. These fatty acids then circulate in the bloodstream, interacting with receptors on cells to reduce inflammation and prevent harmful blood clotting. Additionally, fiber fills you up, aiding in weight loss, which can positively impact heart health.
The link between fiber and heart health was first suggested in the 1950s and 1960s, and this notion gained further traction in the 1970s. Since then, numerous studies, including short-term clinical trials and long-term observational trials, have reinforced this connection. One particular study, the Cardiovascular Health Study, involving 4,125 older adults, found that higher fiber intake, especially from cereal grains, correlated with reduced levels of inflammation. Specifically, a mere 5-gram increase in daily fiber consumption was associated with significantly lower blood levels of C-reactive protein (CRP), a biomarker of heart attack risk.
The recommended daily fiber intake varies with age and gender. Men under 50 should aim for 38 grams of fiber per day, while those over 50 should target 30 grams. For women, the recommended intake is 25 grams per day up to the age of 50, and 21 grams thereafter. Unfortunately, many people fall short of these targets, with Americans consuming only about 16 grams of fiber per day on average.
To increase fiber intake, opt for whole grain products that are labeled "100% whole wheat" or "100% whole grain". Aim for bread with at least 3 grams of fiber per slice, and cereals with a minimum of 6 grams of fiber per serving. Additionally, include plenty of fiber-rich fruits, vegetables, legumes, nuts, and seeds in your diet.
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Frequently asked questions
Yes, a grain-based diet can have fibre if it includes whole grains. Whole grains contain the bran and germ of the grain, which are the parts that provide fibre.
Whole grains are grains that have not been processed to remove the bran and germ. Examples of whole grains include whole wheat flour, muesli, quinoa, wild rice, and more.
Refined grains have been milled, or ground, in a way that removes the bran and germ, resulting in a finer texture and improved shelf life. However, this process also removes dietary fibre, iron, and B vitamins. Examples of refined grains include white flour, white pasta, white bread, and white rice.
Fibre is important for several reasons. It helps with healthy digestion and bowel function, improves blood cholesterol levels, and may lower the risk of heart disease, stroke, obesity, and type 2 diabetes. Fibre can also aid in weight management by helping you feel full and satisfied with fewer calories.
Yes, if you are on a grain-free diet, you can still get fibre from other sources such as fruits, vegetables, legumes, nuts, and seeds. However, it is important to ensure you are getting enough fibre, as fibre deficiency is common. The Dietary Guidelines for Americans recommend consuming 25-35g of fibre per day.
