High Fibre Foods: How Much and Where From

After protein, high fibre food is the second habit we press hardest on, and it is also the one most often ignored. Most adults in Malaysia take in far less than the daily target, and the effect is not only on digestion. It changes fullness, blood sugar after meals, and the make up of gut bacteria.

How much fibre is needed

The usual target is around thirty grams a day for an adult. For scale, a bowl of white rice gives less than one gram. That means the target will not be hit by accident. It has to be planned, and it has to be built up in stages rather than all at once.

Where it comes from

• Legumes and dal, six to eight grams per half cup
• Fruit with the skin on such as apples and pears, around four grams each
• Leafy vegetables and broccoli, two to three grams per serving
• Chia and flax seeds, five grams per tablespoon
• Whole oats, around four grams per half cup dry
• Brown rice or quinoa in place of white rice, three to four grams per serving

Why high fibre food changes fullness

Soluble fibre absorbs water and forms a gel in the stomach, which slows stomach emptying. The effect is that fullness lasts longer after a meal of the same size. For people who complain of being hungry again two hours after lunch, fibre is usually the missing piece. It also flattens the rise in blood sugar after eating, which reduces the afternoon slump and the pull towards something sweet.

How to add it without upsetting your stomach

Adding fifteen grams of fibre in one day will cause bloating and gas. That is the main reason people try it and quit within three days. Add five grams a week, and raise water intake at the same time. Fibre without water makes constipation worse, not better. For people with IBS or a sensitive gut, the type of fibre matters more than the amount, and it is worth discussing with a doctor. Read the gut problems guide.

Fibre during drug therapy

For anyone on treatment that slows stomach emptying, fibre needs adding more carefully. Too much too fast can add to fullness and nausea. The usual approach is to build up more slowly, choose gentler sources such as oats and cooked vegetables, and keep water up across the day.

What usually changes within four weeks

The first change people notice is usually not weight but the frequency and consistency of bowel movements, followed by less pull towards eating at night. Changes in blood markers such as lipids take longer and only show up on a repeat test.

Next step

If there are persistent gut symptoms, severe bloating or a change in bowel habit, that needs checking before fibre gets added. Book a consultation, or read daily protein sources.

The healthy-eating principles behind these suggestions are published by the WHO.

Every iLIV guide is written and reviewed under our editorial standards, and each one carries the name of the reviewing doctor together with their MMC registration number.

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