The short version: Most adults benefit from more fiber, but a sudden jump can cause gas and discomfort. Increase it gradually, drink according to thirst, and let whole foods do most of the work.
Fiber is more than one thing
Dietary fiber includes carbohydrates that are not fully digested in the small intestine. Different fibers behave differently: some form gels, some add bulk, and some are fermented by gut microbes. That is why no single supplement reproduces the variety found in beans, oats, fruit, vegetables, nuts, seeds, and whole grains.
What is a reasonable target?
Public-health guidance commonly lands around 22 to 34 grams per day for adults, depending on age and sex. Canada’s reference values are 25 grams for women and 38 grams for men. These are useful guideposts, not a reason to force food when you are uncomfortable.
A gentler way to increase fiber
- Add one change at a time—perhaps fruit at breakfast or beans in one lunch.
- Keep the foods you already like and upgrade them: mix whole-grain and refined pasta, add lentils to soup, or top yogurt with berries.
- Increase over days or weeks, especially if your current intake is low.
- Notice tolerance. Irritable bowel syndrome, inflammatory bowel disease, recent surgery, and some medications can change what works.
Food first, supplements second
A supplement can be useful for a specific goal, but food brings vitamins, minerals, texture, and a wider range of fibers. If you use a supplement, follow the label, start low, and keep it separated from medications when a pharmacist advises you to do so.
The habit that lasts
Think in weekly variety rather than daily perfection. A pantry with oats, canned beans, whole-grain bread, frozen vegetables, fruit, nuts, and seeds makes the higher-fiber choice ordinary—and ordinary choices are the ones that survive busy weeks.