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Dietary Fibre: Functions, Intake and Food Sources

Dietary fibre consists of indigestible plant components that support healthy digestion, promote gut health, and contribute to overall well-being.

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Things worth knowing about "Dietary Fibre"

Dietary fibre consists of indigestible plant components that support healthy digestion, promote gut health, and contribute to overall well-being.

What is Dietary Fibre?

Dietary fibre refers to plant-based food components that cannot be fully digested by enzymes in the human small intestine. They pass largely intact into the large intestine (colon), where they perform a wide range of important physiological functions. Dietary fibre is found primarily in vegetables, fruits, legumes, and whole grains.

Types of Dietary Fibre

Soluble Fibre

Soluble fibres such as pectin, beta-glucan, and inulin dissolve in water and form a gel-like substance in the digestive tract. They slow gastric emptying, promote a longer feeling of fullness, and serve as a food source for beneficial gut bacteria (known as a prebiotic effect).

Insoluble Fibre

Insoluble fibres such as cellulose and lignin do not dissolve in water but increase stool bulk and accelerate intestinal transit. They help prevent constipation and support regular bowel movements.

Biological Functions

Promoting a healthy gut microbiome through prebiotic activity
Regulating bowel function and preventing constipation
Lowering blood sugar levels by slowing carbohydrate absorption
Reducing LDL cholesterol (bad cholesterol) levels
Supporting healthy body weight through increased satiety
Potentially reducing the risk of colorectal cancer

Recommended Daily Intake

The World Health Organization (WHO) and major nutritional authorities recommend that adults consume at least 25 to 30 grams of dietary fibre per day. Children have lower requirements that vary according to age. Average fibre intake in many Western populations remains below this recommendation.

Food Sources

Vegetables: Broccoli, carrots, peas, artichokes
Fruits: Apples, pears, berries, bananas
Legumes: Lentils, beans, chickpeas
Whole grains: Oats, wholegrain bread, brown rice
Nuts and seeds: Flaxseeds, chia seeds, almonds

Symptoms of Insufficient Intake

A chronically low fibre intake can lead to various health problems, including:

Chronic constipation
Increased risk of bowel disorders such as diverticulosis or colorectal cancer
Poorer blood sugar control and increased risk of type 2 diabetes
Elevated blood lipid levels
Dysbiosis (imbalance of the gut microbiome)

Overconsumption and Interactions

A very high fibre intake, especially when increased abruptly, can cause bloating, abdominal cramps, and diarrhoea. It is advisable to increase fibre intake gradually and to drink adequate fluids (at least 1.5 to 2 litres of water daily). High fibre intake may also reduce the absorption of certain minerals such as iron, calcium, and zinc, as well as some medications.

Dietary Fibre Supplements

Those who cannot meet their fibre needs through diet alone may consider supplements containing psyllium husk, inulin, or wheat bran. Such supplements can be used as a complement but do not replace a balanced, fibre-rich diet.

References

World Health Organization (WHO): Diet, nutrition and the prevention of chronic diseases. WHO Technical Report Series 916, Geneva (2003)
Slavin JL: Dietary fiber and body weight. Nutrition. 2005;21(3):411-418. PubMed PMID: 15797686
Reynolds AN et al.: Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. The Lancet. 2019;393(10170):434-445. PubMed PMID: 30661739

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