Oats, a Pear and a Cup of Lentils: The Math
A third of a cup of dry rolled oats weighs 27 g and holds about 2.7 g of fibre, worked out from USDA FoodData Central's figure of 10.1 g per 100 g.
A medium raw pear weighs around 178 g and carries about 5.5 g of fibre, based on 3.1 g per 100 g.
A cup of boiled lentils weighs 198 g and contains about 15.6 g of fibre, at a density of 7.9 g per 100 g.
Add the three together: 2.7 g from oats, 5.5 g from the pear and 15.6 g from the lentils comes to about 23.8 g before anything else is eaten that day.
Why 25 and 30 Are the Numbers That Matter
Australian nutrient reference values set an adequate intake of 25 g of fibre a day for adult women and 30 g for adult men.
The 23.8 g from oats, pear and lentils sits just under the 25 g mark for women and further under the 30 g mark for men.
Vegetables, bread and other fruit eaten across the same day close that final gap, since no single meal is expected to supply the whole target on its own.
This is why fibre planning works better as a running daily tally than as a single meal to get right.
What a Cup of Chickpeas Adds to the Tally
A cup of drained, rinsed canned chickpeas weighs 152 g and holds about 9.6 g of fibre, at 6.3 g per 100 g.
Swapped in for the lentils, or added alongside them, chickpeas show how a single legume serve can shift the day's total by close to 10 g.
These numbers move with variety, brand and cooking method, so the packet's nutrition information panel is the figure to trust for that specific product rather than a general average.
Where a Fibre Blend Fits the Remaining Grams
BIOMEWARD is an Australian daily prebiotic fibre powder sold in a 165 g lemon-flavour pouch with 30 serves, built from a blend of 32 g PHGG, 23 g psyllium, 16 g resistant potato starch, 14 g acacia and 7 g inulin per 100 g.
The research page behind the product links 36 papers, 35 of them human studies and one laboratory study, each traceable through PubMed or a DOI, with null results included rather than left out.
None of that changes the arithmetic above: oats, pear and lentils still land at about 23.8 g, and whatever gap remains to 25 g or 30 g gets closed by the rest of the day's food, or by whatever else is added to the tally.
The practical habit is to add up a day's meals against 25 g or 30 g the same way this article did, rather than guessing whether a plate has enough.