Are you rough enough?
Chances are, you’re not. And we’re not talking about social behaviour, unkempt hair, or unruly clothes. Adults (no matter what their hairstyle) need between 25 and 35 grams of dietary fibre every day, though most of us are lucky if we get ten.
Fibre is an important nutrient for a number of reasons. It helps protect against heart disease and diabetes, can assist in weight loss, and – of course – it keeps you regular.
Read on to learn more about fibre and how to get enough of it.
What is fibre?
Fibre is basically a carbohydrate that can’t be digested by the human body. It is found in plants that we eat, such as fruits, vegetables, whole grains, beans, nuts, and seeds. Unlike most nutrients, it is not absorbed by our bodies but passes through the digestive tract largely intact. Yet fibre is very important to good digestive health and also protects against several serious diseases.
There are three types of dietary fibre:
Soluble fibre dissolves in water and turns into a type of gel during digestion. This slows the process of digestion and nutrient absorption.
Good sources of soluble fibre include:
- Oat bran
- Nuts and seeds
- Legumes (dried peas, beans, lentils)
- Apples, pears, and citrus fruits
- Vegetables, such as potatoes and Brussels sprouts
Insoluble fibre does not dissolve in water. Instead, it absorbs many times its weight in water. This creates a soft bulk and appears to speed up the passage of foods through the stomach and intestines. It also adds bulk to the stool.
Good sources of insoluble fibre include:
- Wheat, corn and rice bran
- Brown rice
- Whole-grain cereals and breads
- Dried beans and peas
- Nuts and seeds
Resistant starch is the part of starchy foods (approximately ten percent) which is tightly bound by fibre and resists normal digestion. Friendly bacteria in the large bowel ferment and change the resistant starch into short-chain fatty acids, which are important to bowel health and may protect against colon cancer.
Examples of starchy foods include:
Fibre and weight control
Fibre can assist weight control in several ways. Fibre-rich foods such as fruit, vegetables, potatoes, whole-grain breads, and brown rice contain few calories for volume. Because they are bulky, they keep you feeling fuller for longer. Similarly, you’re also inclined to eat less of high-fibre foods because they are so filling. Even the extra chewing time can contribute to feelings of satiety.
On the other hand, low-fibre foods, such as cakes and chips, are more concentrated in calories and less filling. Therefore, you can easily overeat and consume excessive calories from low-fibre foods before your appetite is satisfied.
For example, compare an apple (high-fibre) and a glass of apple juice (low-fibre). Two or three apples are needed to produce one glass of apple juice. In the juicing process, all the fibre is removed and the sugar and calories become more concentrated. When you choose the apple juice instead of the apple, you consume more calories.
Why is fibre important?
Including fibre in your diet leads to many health benefits.
Type 2 diabetes – A high-fibre diet seems to reduce the risk for type 2 diabetes. Foods that are high in fibre often have a low glycemic index and thus help to regulate blood-sugar levels. Low-fibre foods, on the other hand, are generally high on the glycemic index and cause big spikes in blood-sugar levels. A diet low in fibre and high in high glycemic index foods can more than double the risk for the disease.
Cancer – Do high-fibre diets reduce the risk of colon cancer? Research shows varying results. One of the most recent large-scale study provides evidence in favour of fibre’s protective role, observing that those eating a high-fibre diet (36g or more of daily fibre) were 25 percent less likely to develop polyps than those eating fewer than 12g.
Heart disease – If you have a high intake of dietary fibre, your risk for heart disease can be significantly reduced. In one Harvard study, those who had a high dietary-fibre intake had a 40 percent lower risk of getting heart disease than those with a low intake. The fibre in whole grains appears to be particularly beneficial. Several studies also suggest that higher intake of fibre may help prevent metabolic syndrome (a combination of medical disorders including obesity, insulin resistance, high blood sugar, dyslipidemia and high blood pressure).
Digestive disorders – Because insoluble fibre speeds up the passage of foods through the stomach and intestines, it helps to prevent and alleviate constipation. The fibre in wheat bran and oat bran is particularly effective. Fibre may also help reduce the risk of diverticulosis, a disease which involves inflammation of the bowel and affects a large percentage of the Western adult population. Increased fibre consumption can also help to alleviate the symptoms of this disease.
Good nutrition – Many high-fibre foods are also rich sources of vitamins, minerals, and antioxidants. If you are eating enough fibre, you will inevitably also get more of these nutrients.
How much fibre do I need?
The recommended daily intake of fibre is 25-35g per day for adults. The average Australian only eats less than 20g of fibre per day.
Desirable fibre intake for children (under 18) is calculated by age + 5g. For example, a six-year old needs 6 + 5g = 11g of fibre per day.
It is possible to have too much fibre. Excess fibre can interfere with the absorption of minerals such as calcium, iron, magnesium and zinc, and upset nutritional balance. However, you would need to eat excessive amounts of fibre for these problems to occur.
Combinations of foods that would provide you with enough fibre across the day include:
- High-fibre breakfast cereal (5g) + 4 slices wholegrain bread (6g) + 3 servings fresh fruit (9g) + 35g raw almonds (5g)
- 1 cup brown rice (4g) + 3 servings of vegetables (6g) + ½ cup corn, peas or lentils (5g) + 3 medium figs (5g) + 3 servings fresh fruit (9g)
- 1 cup wholemeal pasta (8g) + 3 servings of vegetables (6g) + 1 cup bean soup (6g) + 3 servings fresh fruit (9g)
- 1 cup porridge (2g) + ½ cup wholemeal pasta (4g) + 1/2 cup sunflower seed kernels (5g) + 3 servings of vegetables (6g) + 3 servings fresh fruit (9g) + 2 slices whole-grain bread (3g)
How to increase your fibre intake and avoid constipation
When increasing your fibre intake, take it slowly. Add just a few grams more at a time to allow the intestinal tract to adjust. Abdominal cramps, gas, bloating, diarrhea, or constipation may result if you increase fibre intake too fast. You should also increase the amount of fluid you drink; drink at least two litres of water daily, as fibre absorbs water.
Other tips for increasing fibre intake:
- Start your day with a bowl of high-fibre breakfast cereal. Add 1-2 Tbsp of unprocessed bran and wheat germ for extra fibre, or try adding nuts, dried fruits and seeds.
- Eat whole-grain breads instead of those made with processed flour.
- Don’t peel fruits and vegetables – much of the fibre content is in the skin!
- Snack on fruits, nuts, and seeds.
- Add bran (barley/wheat/rice) or psyllium husks to soups, casseroles, yoghurt, smoothies, dessert and biscuit recipes.
- Exercise regularly to strengthen the abdominal muscles and stimulate the gut.
- Read food labels for fibre content.
- Add beans to soups, stews, and salads.
- Drink plenty of fluids, as fibre absorbs water!
- Eat bean- or lentil-based dishes in place of meat-based ones a couple of times a week.
- Eat whole fruits instead of drinking fruit juice.
- Snack on raw vegetables instead of chips, crackers, or chocolate bars.
- Experiment with international dishes that use whole-grains and legumes as part of the main meal. For example, Dahl curries (lentils) and Tabouli salad (bulgur wheat).
- Avoid regular use of harsh laxatives, as they can overstimulate the intestinal muscles and may make normal bowel activity impossible.
Mini fibre counter
|Kellogg’s All-Bran, 45g||12|
|Kellogg’s Just Right, 45g||3.8|
|Sanitarium Weet-Bix, 30g||3.3|
|Sanitarium Cornflakes, 30g||1|
|Uncle Toby’s Fibre Plus, 45g||6.4|
|Freedom Foods Gluten/Wheat-Free Muesli||3|
|Kellogg’s Special K, 30g||1|
|White, 1 slice, 25g||0.6|
|Wholemeal, 1 slice, 30g||1.8|
|Multi-grain, 1 slice, 30g||1.4|
|Dark rye bread, 1 slice, 30g||2.4|
|Hyfibre White, 1 slice, 37g||2|
|Wonder White, 1 slice, 33g||1.2|
|Fruit loaf, 1 slice, 30g||1|
|Pasta and Rice|
|White rice, cooked, 1 cup||1.6|
|Brown rice, cooked, 1 cup||2.4|
|Pasta, cooked, 1 cup||1.5|
|Wholemeal pasta, cooked, 1 cup||8.3|
|Nuts and Seeds|
|Almonds, raw, 30g||2.7|
|Peanut butter, 1 tablespoon||2.2|
|Sunflower seeds, 30g||3.3|
|Psyllium husks, 1 tablespoon||4|
|Apple, large, with skin||4.7|
|Avocado, 1/2 medium||1.2|
|Kiwi Fruit, medium||3.5|
|Dried apricots, 30g||2.7|
|Dried figs, 30g||4.4|
|Asparagus, 5 spears||1.5|
|Beans, green, 1 cup||3.6|
|Carrot, 1 medium||4.2|
|Cauliflower, 1 cup||4|
|Potato, medium, with skin||5.3|
|Lentils, Beans, Soybean products|
|Tofu, firm, 125g||2.8|
|Lentils, cooked, 100g||4|
|Red kidney beans, canned, 1 cup||13|
|Baked beans, 1/2 cup||6|
For more information and fibre counts, refer to Allan Borushek‘s Pocket Calorie, Fat, and Carbohydrate Counter or the Calorie King Food Database.