Dietary Fibre: An Essential Nutrient

Dietary fibre is often overlooked in conversations about nutrition, yet it plays a crucial role in our overall health. Fibre is an essential nutrient our body needs to function at its best. In this article, we'll look at the different types of dietary fibre and explore their many benefits.

What Is Dietary Fibre?

Dietary fibre is a type of carbohydrate, but the body doesn't have the enzymes needed to fully digest it. In other words, the body won't break fibre down into sugar molecules. It travels through the intestines undigested until it reaches the large intestine, the colon, where our gut bacteria use it as an energy source.

The recommended fibre intake is at least 25 g and up to 55 g per day for men and women. Most Canadians and Americans don't get enough fibre each day, falling below the recommended minimum.

Types of Fibre

There are 2 types of fibre: soluble and insoluble.

Soluble fibre forms a gel when it comes into contact with water. It helps slow down glucose absorption after a meal, which lowers blood sugar and also helps reduce LDL cholesterol, also known as "bad cholesterol." This is the fibre you especially want during diarrhea or when you need to slow things down, since it absorbs excess water to form well-formed stools and slows transit time.

Foods rich in soluble fibre include:

• Oats
• Hulled barley
• Psyllium
• Quinoa
• Beans and legumes
• Chia seeds
• Flaxseed
• Citrus fruits, like oranges and clementines
• Other fruits like apples, pears and papayas
• Vegetables like carrots, zucchini, asparagus, sweet potatoes, Brussels sprouts and broccoli

Insoluble fibre doesn't dissolve in water. Instead, it adds bulk to stool, which helps food move through the digestive system. This is the fibre you especially want during constipation, since it speeds up transit and keeps stools from drying out when things move slowly. It's also beneficial because it helps regulate your digestive system while boosting fullness by adding bulk to food in the stomach.

Foods rich in insoluble fibre include:

• Whole grains like brown and wild rice
• Beans and legumes like chickpeas and lentils
• Nuts like almonds and walnuts
• Seeds like chia and flaxseed
• Fruits like bananas, kiwis, pears and apples with the skin on
• Dried fruit like dried apricots
• Vegetables like kale, eggplant, green beans, cauliflower and spinach

Benefits of Dietary Fibre

The viscous gel formed by soluble fibre slows down the movement of food through the digestive system. When food moves more slowly, it gives the body more time to break it down and absorb nutrients. As the gel forms, it creates a barrier between food and the intestinal lining where absorption happens. This barrier slows how quickly glucose enters the bloodstream. Instead of a fast spike, glucose is released into the blood more gradually. By slowing glucose absorption, soluble fibre helps prevent the sharp blood sugar spikes that can happen after eating. This leads to more gradual, more stable increases in blood sugar. Stable blood sugar means more consistent energy throughout the day. You avoid the highs and lows tied to rapid blood sugar spikes and drops, which can lead to fatigue and cravings.

That said, dietary fibre reduces the risk of developing a number of health issues, such as:

• Type 2 diabetes, by slowing glucose absorption, which helps avoid the blood sugar spike after a meal and leads to more stable blood sugar.

• Cardiovascular disease, by controlling blood sugar and lowering total and LDL cholesterol. With a similar effect to glucose, the cholesterol and saturated fat from meals get trapped in the gel formed by soluble fibre and are then excreted in stool. This reduces how much saturated fat the body absorbs, helping maintain healthy LDL cholesterol levels, a major risk factor for heart disease.

• Colorectal cancer, bowel issues and inflammatory bowel disease, offering some protection thanks to fibre from fruits, vegetables and legumes. Fibre is fermented by the gut microbiome, producing short-chain fatty acids, which are the main energy source for the cells lining the colon. As a result, eating enough fibre helps the good bacteria in the gut thrive, growing in number and diversity, which helps reduce inflammation.

Conclusion

In short, whether it's supporting digestive wellness, heart health or weight management, fibre is an essential nutrient our body needs to function at its best. By adding more fibre to your diet, you can effectively manage your blood sugar and improve your quality of life. Remember that small, consistent changes can lead to meaningful improvements over time.