Which foods are high in prebiotic fiber
Prebiotic fiber content varies from 85% of weight in gum arabic down to 1% in raw banana, so the food you pick decides how many grams you weigh out. This page gives the percentages, the exact gram portions that deliver a 6 g serving of fructan, and a step order for building a day around them.
| Food | Fiber by weight |
|---|---|
| Gum arabic (acacia) | 85% |
| Raw dry chicory root | 64.6% |
| Raw dry Jerusalem artichoke | 31.5% |
| Raw dry dandelion greens | 24.3% |
| Raw dry garlic | 17.5% |
| Raw dry leek | 11.7% |
| Raw dry onion | 8.6% |
| Raw asparagus / raw wheat bran | 5% each |
Gum arabic tops the list at 85% by weight, and every other food falls below 65%.
The ranking below is a share of prebiotic fiber by weight, read directly from the reference table. Gum arabic, also called acacia, is the densest source at 85% of its weight, followed by raw dry chicory root at 64.6% and raw dry Jerusalem artichoke at 31.5%.
The middle of the list holds the everyday kitchen items: raw dry dandelion greens at 24.3%, raw dry garlic at 17.5%, raw dry leek at 11.7% and raw dry onion at 8.6%. The bottom of the list sits at or below 5%, where raw asparagus and raw wheat bran both measure 5%, cooked whole wheat flour 4.8% and raw banana 1%.
Because the spread runs from 85% down to 1%, the same 6 g of fructan translates into wildly different gram weights depending on which food you weigh out.
No dated events are listed for this topic, so the sequence is left empty.
Six grams of fructan takes 9.3 g of chicory root or 69.8 g of onion — a sevenfold difference in portion weight.
The portion figures are ordered from the smallest gram weight to the largest, so the densest foods appear first. Raw chicory root needs 9.3 g, raw Jerusalem artichoke 19 g, raw dandelion greens 24.7 g, raw garlic 34.3 g, raw leek 51.3 g and raw onion 69.8 g.
Read the list as a trade-off: a smaller weight on the scale means a denser fiber source, and a larger weight means you are eating more of the food itself to reach the same 6 g of fructan.
The full gram portions sit on the page Grams of Food for 6 g of Fructan, where each row is one food weighed out to the same target.
A traditional diet in Africa provided 38 grams of resistant starch per day, a separate fiber family from fructan.
Resistant starch and fructan are not the same measure, so the 38 g figure cannot be added to a fructan target. It is still the one daily quantity listed here, and it gives a scale for judging whatever amount you settle on.
The foods carrying resistant starch overlap only partly with the fructan list: cooked whole wheat flour at 4.8% and raw wheat bran at 5% sit on both sides of the comparison, while gum arabic and chicory root are fructan-forward sources.
Use the 38 g number as a comparison point, not as a goal, because no broad consensus on an ideal daily intake of prebiotic fiber exists.
| Food | Fiber by weight | Grams for 6 g fructan |
|---|---|---|
| Gum arabic (acacia) | 85% | not listed |
| Raw dry chicory root | 64.6% | 9.3 g |
| Raw dry Jerusalem artichoke | 31.5% | 19 g |
| Raw dry dandelion greens | 24.3% | 24.7 g |
| Raw dry garlic | 17.5% | 34.3 g |
| Raw dry leek | 11.7% | 51.3 g |
| Raw dry onion | 8.6% | 69.8 g |
| Raw asparagus / raw wheat bran | 5% each | not listed |
Figures on this page come from the reference tables for prebiotic fiber percentages and 6 g fructan portions.