Jeffrey Salazar
Fiber is a type of carbohydrate that the body cannot digest. It is found in the indigestible parts of cereals, fruits, and vegetables. A high-fiber diet has numerous health benefits, including a reduced risk of constipation, inflammatory bowel disease, irritable bowel syndrome, diverticulitis, heart disease, and some cancers. Soluble fiber, which is found in oats, strawberries, and avocados, can help manage blood sugar and cholesterol levels. Insoluble fiber, which is found in cellulose and hemicellulose, can speed up the time that food passes through the gut and may reduce lipid absorption.
| Characteristics | Values |
|---|---|
| Definition | Dietary fiber is a type of carbohydrate that the body cannot digest. |
| Sources | Found in the indigestible parts of cereals, fruits, and vegetables, including pears, strawberries, avocados, oats, and kidney beans. |
| Health Benefits | A high-fiber diet has numerous health benefits, including: • Relief from inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis. • Improved insulin sensitivity and glycemic management, potentially reducing the risk of type 2 diabetes. • Lowering blood cholesterol and reducing the risk of heart disease. • Promoting regularity and relieving constipation. • Slowing down digestion and delaying blood sugar rises after meals. • Reducing the risk of certain cancers, including bowel cancer. |
| Types | Soluble fiber and insoluble fiber. Soluble fiber absorbs water and can increase stool weight, while insoluble fiber does not absorb water and speeds up the passage of food through the gut. |
| Supplements | Psyllium, methylcellulose powders or wafers, and resistant starch from high-amylose corn. |
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What You'll Learn
Soluble fibre helps lower cholesterol and manage blood sugar
Fiber is a type of carbohydrate that the body cannot digest. Unlike most carbohydrates, fiber cannot be broken down into sugar molecules. There are two types of fiber: soluble and insoluble. Each type has important health benefits and plays a different role in the body. Soluble fiber, in particular, can help lower cholesterol and manage blood sugar.
Soluble fiber dissolves in water and forms a gel-like substance in the stomach, slowing digestion. This property helps to delay blood sugar rises after meals. Soluble fiber also interferes with bile acid production. The liver uses cholesterol to make bile acids. By binding to bile acids in the gut and excreting them from the body, soluble fiber lowers the amount of bile acid in the body, causing the liver to pull cholesterol from the blood to make new bile acids. This, in turn, lowers blood cholesterol. A meta-analysis of 67 controlled trials found a modest benefit of dietary soluble fiber in lowering total and LDL cholesterol.
Soluble fiber can also help manage blood sugar by preventing blood glucose surges after eating. Since fiber isn't digested, it doesn't cause a spike in blood sugar like other carbohydrates. This can be especially helpful for people with diabetes, as control of blood glucose is important in managing the condition. Epidemiological studies have found that a high intake of dietary fiber is associated with a lower risk of heart disease and deaths from cardiovascular disease.
In addition to the benefits of soluble fiber, insoluble fiber can also provide health benefits. Insoluble fiber, such as cellulose and wheat bran, provides excellent bulking effects, adding bulk and weight to the stool, making it easier to pass. Consistent intake of fermentable fiber, which can be soluble or insoluble, may reduce the risk of chronic diseases.
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Insoluble fibre speeds up digestion and prevents constipation
Fibre is a type of carbohydrate that the body cannot digest. It is found in the indigestible parts of cereals, fruits, and vegetables. A diet high in fibre keeps the digestive system healthy. Insoluble fibre, which does not absorb water, speeds up the time that food passes through the gut. It includes cellulose, hemicelluloses, and lignin, which make up the structural parts of plant cell walls.
Insoluble fibre can be found in wholegrain cereals, fruits, and vegetables. Examples of insoluble fibre sources include resistant starch, inulin, fructans, fructooligosaccharides, oligo- or polysaccharides, and resistant dextrins. These sources may be partially or fully fermented. For instance, resistant starch from high-amylose corn has been used as a supplement and may contribute to improving insulin sensitivity and glycemic management. It may also reduce the risk of type 2 diabetes.
Consistent intake of fermentable fibre may reduce the risk of chronic diseases. Insufficient fibre in the diet can lead to constipation. Insoluble fibre speeds up the passage of food through the gut, helping to prevent constipation. Soluble fibre, on the other hand, can help with constipation by adding bulk to stools. Soluble fibre includes pectins, gums, and mucilage, found mainly in plant cells.
To increase your fibre intake, you can add oatmeal, pulses, and fresh fruits and vegetables to your diet. Fruits high in fibre include strawberries, pears, apples, raspberries, bananas, and avocado. Vegetables that contain a good amount of fibre include carrots, beets, broccoli, artichokes, sweet potatoes, and Brussels sprouts. Legumes such as kidney beans are also a good source of fibre.
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Fibre intake can reduce the risk of chronic diseases
Fiber is a type of carbohydrate that the human body cannot digest. It is important for the health of the digestive system and for lowering cholesterol. A high-fiber diet can reduce the risk of developing various conditions, including chronic diseases.
The two main types of fiber are water-soluble and water-insoluble. Soluble fiber, found in fruits, vegetables, legumes, and oats, absorbs water during digestion, increasing stool bulk and possibly lowering cholesterol levels. Insoluble fiber, on the other hand, remains unchanged during digestion, promoting normal intestinal movement.
A consistent intake of fermentable fiber, which acts as food for gut bacteria, may reduce the risk of chronic diseases. For example, a high-fiber diet has been linked to a reduced risk of cardiovascular disease, with multiple studies reporting a lower relative risk of cardiovascular disease mortality, incidence, and stroke. Additionally, dietary fiber can reduce serum cholesterol and blood pressure, which are contributing factors to the development of coronary heart disease.
Fiber may also reduce the risk of type 2 diabetes. Soluble fiber can help prevent blood glucose surges after eating and lower blood cholesterol by interfering with bile acid production. A diet high in fiber is also associated with a lower risk of developing heart disease, which is doubled in diabetic patients. Furthermore, the FDA has approved a claim that consuming resistant starch from high-amylose corn may reduce the risk of type 2 diabetes by increasing insulin sensitivity.
The recommended daily fiber intake for adults is around 25-30 grams, but the average intake in the United States is only about half of that. To increase fiber intake, the American Heart Association suggests including whole grains, oats, legumes, and fiber-rich fruits and vegetables in the diet.
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Fibre supplements can help manage irritable bowel syndrome
Fibre is a type of carbohydrate that the body cannot digest. It can be viscous with a gel-like quality, or it can be fermentable, acting as food for gut bacteria. Insoluble fibres like cellulose and wheat bran provide excellent bulking effects, while soluble fibres like psyllium provide viscosity and can help lower blood cholesterol. Consuming fibre can help prevent blood glucose surges after eating, reduce hunger, and lower the risk of chronic diseases.
Irritable bowel syndrome (IBS) is a common chronic gastrointestinal disorder. It is widely believed that IBS is caused by a deficient intake of dietary fibre, and most physicians recommend that patients with IBS increase their fibre intake to relieve symptoms. However, different types of fibre have different physical and chemical properties, and the associated health benefits are specific to each type. Short-chain soluble and highly fermentable dietary fibre can cause abdominal pain, bloating, and flatulence in patients with IBS due to rapid gas production. In contrast, long-chain, intermediate viscous, soluble, and moderately fermentable dietary fibre results in low gas production and the absence of symptoms related to excessive gas.
The Academy of Nutrition and Dietetics recommends 25 grams of fibre per day for women and 38 grams per day for men, regardless of whether they have IBS. The majority of this intake should come from natural sources such as vegetables, fruits, whole grains, cereals, legumes, and seeds. However, patients with IBS should be mindful of their food choices, as certain high-fibre foods like wheat bran can cause symptoms in patients with IBS. These patients may be better served by choosing a low-FODMAP product.
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High-fibre diets are linked to lower rates of bowel cancer
Fibre is a type of carbohydrate that the body cannot digest. It is essential to a healthy diet as it helps with digestion and excretion, and it can lower the risk of several diseases.
There are several mechanisms through which fibre may reduce the risk of colorectal cancer. Fibre can dilute fecal carcinogens, reduce transit time, and increase bowel movement, meaning that harmful chemicals spend less time in the bowel. Fibre can also bind to bile acids, which are involved in colonic carcinogenesis, and modify the gut-liver axis. Additionally, fibre can be fermented by gut bacteria into butyrate, which has anti-carcinogenic properties and helps the cells in the bowel stay healthy.
It is important to note that not all cases of bowel cancer can be prevented through diet alone. However, eating a high-fibre diet, including plenty of wholegrains, fruits, vegetables, and pulses, can be a beneficial way to reduce the risk of bowel cancer.
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Frequently asked questions
Fiber is used to keep the digestive system healthy.
A diet high in fiber can help prevent constipation, lower cholesterol levels, and reduce the risk of chronic diseases, diabetes, heart disease, and some cancers.
High-fiber foods include fruits (such as strawberries, pears, apples, avocados), vegetables (such as carrots, beets, broccoli, sweet potatoes), legumes (such as chickpeas, kidney beans), and whole grains (such as oats, quinoa).
There are two main types of fiber: soluble and insoluble. Soluble fiber absorbs water and helps to bulk out stool, while insoluble fiber does not absorb water and speeds up the passage of food through the gut.
The recommended daily minimum intake of fiber is 30 grams for healthy adults. However, it is important to add fiber to your diet gradually to prevent gas and bloating.
