The Dietary Fiber Daily Value
The fiber Daily Value is 28 g. The hard part is what the panel lets you count toward it: since 2016 the word fiber means something narrower than it does in a formulation spreadsheet. The accepted isolated fibers, and what happens to the rest.
The nutrition label Daily Value for fiber is 28 g. That number is the easy part of this row. The hard part is deciding how many grams you are allowed to put above it, because since the 2016 rule the word "fiber" on a Nutrition Facts panel means something narrower than it means in a formulation spreadsheet. A non-digestible carbohydrate that survives digestion and is sold to you as fiber may still not be declarable as fiber on the label.
This article covers the 28 g Daily Value, the regulatory definition of dietary fiber in 21 CFR 101.9(c)(6)(i), the isolated or synthetic non-digestible carbohydrates FDA has accepted, the rounding rule and the "less than 1 gram" option, the "Not a significant source of dietary fiber" statement, and the voluntary soluble and insoluble fiber lines.
For the reference values themselves rather than the fiber row in particular, the full set of DRVs and RDIs is in Daily Values on the Nutrition Facts label, and every value in one place is in the FDA Daily Value chart.
The nutrition label Daily Value for fiber is 28 g, and it is a DRV
Dietary fiber appears in the table of Daily Reference Values in 21 CFR 101.9(c)(9), alongside fat, saturated fat, cholesterol, total carbohydrate, sodium, protein and added sugars. The table gives four population columns, and fiber has a value in three:
| Population column | Dietary fiber DRV |
|---|---|
| Adults and children 4 years and older | 28 g |
| Infants through 12 months | Not applicable |
| Children 1 through 3 years | 14 g |
| Pregnant women and lactating women | 28 g |
The DRV and RDI distinction matters for one practical reason: rounding of the percentage. Fiber is a DRV nutrient, so its percent Daily Value rounds to the nearest whole percent, not onto the stepped 2, 5 and 10 percent ladder that vitamins and minerals use. A product with 3.1 g of fiber per serving gives 11.07 percent and declares as 11% DV.
The 28 g figure is relatively new. Before the 2016 modernization of the Nutrition Facts label the fiber DRV was 25 g, so an old panel and a new one for the same product show different percentages for the same grams. Our %DV calculator uses the current values and shows the raw percentage next to the declared one.
What the regulation counts as dietary fiber
21 CFR 101.9(c)(6)(i) defines dietary fiber in two halves, and the second half is the one that changed everything for formulators. The regulation says dietary fiber is:
non-digestible soluble and insoluble carbohydrates (with 3 or more monomeric units), and lignin that are intrinsic and intact in plants; isolated or synthetic non-digestible carbohydrates (with 3 or more monomeric units) determined by FDA to have physiological effects that are beneficial to human health.
Read it as two routes to the same label row. The first is intrinsic and intact fiber: the cell wall material in the oats, beans, wheat bran and fruit you put into the formula. It qualifies because it arrived in the plant matrix and stayed there, and FDA does not need to have named it. The second route covers anything added as a purified ingredient, whether extracted from a plant or made synthetically, and that route is closed unless FDA has determined the substance has a physiological effect beneficial to human health.
Both routes carry the same chain-length floor: 3 or more monomeric units. A non-digestible carbohydrate below that is outside the definition however it got into the food.
That second route is what makes this a compliance question rather than an analytical one. Before 2016, a laboratory method that measured non-digestible carbohydrate effectively defined fiber for label purposes. Now the analytical result is the starting point and the regulatory definition is a filter applied on top of it, so a total dietary fiber assay on a product containing a popular added fiber can read considerably higher than the number you may declare.
The isolated or synthetic fibers FDA has accepted
The regulation names the isolated or synthetic non-digestible carbohydrates determined to have beneficial physiological effects and which therefore "shall be included in the calculation of the amount of dietary fiber." As 101.9(c)(6)(i) stands, those are:
- beta-glucan soluble fiber (as described in 21 CFR 101.81(c)(2)(ii)(A))
- psyllium husk (as described in 21 CFR 101.81(c)(2)(ii)(B)(1))
- cellulose
- guar gum
- pectin
- locust bean gum
- hydroxypropylmethylcellulose
That is 7 entries, two of them defined by cross-reference rather than by name alone. Beta-glucan soluble fiber and psyllium husk are not accepted in any form: they are accepted as described in 101.81, which specifies the sources and characteristics that count. If your beta-glucan comes from a source or in a form outside that description, the cross-reference does not carry it.
Two points about this list cause arguments. First, it constrains only the isolated and synthetic route. Pectin appearing on it does not mean the pectin naturally present in an apple needs to be listed; that pectin is intrinsic and intact in the plant and qualifies under the first half of the definition. The list matters when you buy pectin in a bag and add it. Second, the list is the list. An ingredient that is not on it and is not intrinsic and intact in a plant is not declarable as dietary fiber, however confidently a supplier's specification sheet describes it as fiber.
The consequence: added fiber that cannot be declared as fiber
This is where formulation and labeling come apart. Suppose you add a purified non-digestible carbohydrate to a bar to raise its fiber content. It is non-digestible, it has 3 or more monomeric units, and your laboratory's total dietary fiber assay picks it up. It is not intrinsic and intact in a plant, because you added it as an isolated ingredient, and it is not one of the seven named in 101.9(c)(6)(i). It therefore does not go into the dietary fiber figure on the panel.
Where does it go instead? Into total carbohydrate. That figure is calculated by difference under 101.9(c)(6), by subtracting crude protein, total fat, moisture and ash from the total weight of the food, so the added non-digestible carbohydrate is already inside it. It simply does not get pulled out onto the indented dietary fiber line.
The regulation anticipates this and imposes recordkeeping for it. Under 101.9(g)(10)(i), when a mixture of dietary fiber and added non-digestible carbohydrate that does not meet the definition is present in the food, the manufacturer must make and keep written records of the amount of the non-digestible carbohydrate added that does not meet the definition. Paragraphs (g)(10)(ii) and (iii) impose the parallel requirement when soluble or insoluble fiber is declared. Those records are the evidence that your declared figure excluded what it was supposed to exclude.
The knock-on effects reach your claims. A "good source of fiber" claim under 21 CFR 101.54(c) requires 10 to 19 percent of the DRV per reference amount customarily consumed, and "high in fiber" under 101.54(b) requires 20 percent or more. Those percentages are computed from declarable fiber, so a non-qualifying added fiber cannot buy you a claim. A disclosure is attached to fiber claims specifically: under 101.54(d), if the product is claimed to be high in fiber, a good source of fiber, or to contain more fiber, and the food is not low in total fat, the label must disclose the level of total fat per labeled serving, in immediate proximity to the claim and in type no smaller than half the size of the claim.
Rounding the fiber line, and the "less than 1 gram" option
Dietary fiber is declared indented under total carbohydrate and expressed to the nearest gram. Below 1 gram, 101.9(c)(6)(i) offers choices rather than one answer:
| Fiber per serving | What you declare |
|---|---|
| 1 g or more | To the nearest gram, for example 3.1 g declares as 3 g |
| 0.5 g up to less than 1 g | Declaration not required; alternatively "Contains less than 1 gram" or "less than 1 gram" |
| Less than 0.5 g | Declaration not required; may be expressed as zero, or the "less than 1 gram" wording may be used |
Note the wording. Below 1 gram, declaration of dietary fiber "is not required." That is permission to leave the line off entirely, not merely permission to print a small number, and it is what triggers the statement described in the next section. Both alternative phrasings appear in the regulation, so "Contains less than 1 gram" and "less than 1 gram" are equally acceptable. Only below 0.5 g may you express the content as zero.
On the compliance side, a declared fiber value is held to the class rules in 101.9(g). When dietary fiber is a Class I nutrient, added to a fortified or fabricated food, the composite must be formulated to be at least equal to the declared value under 101.9(g)(4)(i). When it is a Class II nutrient, naturally occurring, the composite must be at least 80 percent of the declared value under 101.9(g)(4)(ii). Under-delivering on fiber is the risk the rule guards against.
"Not a significant source of dietary fiber"
Taking the option not to declare fiber does not simply give you a shorter panel. 101.9(c)(6)(i) requires that when dietary fiber content is not required and as a result is not declared, the statement "Not a significant source of dietary fiber" must be placed at the bottom of the table of nutrient values, in the same type size. The regulation gives one carve-out, "except as provided for in paragraph (f)," which is the simplified format.
Paragraph (f) is available when a product contains insignificant amounts of eight or more of the listed nutrients, and under 101.9(j)(5)(i) for infant and toddler labels when it contains insignificant amounts of six or more. For most nutrients an "insignificant amount" under 101.9(f)(1) is an amount that allows a declaration of zero, but for total carbohydrate, dietary fiber and protein it is an amount that allows a declaration of "less than 1 gram." Fiber below 1 gram therefore counts toward that threshold, and within the simplified format the "Not a significant source of ______" statement is assembled from all the nutrients present in insignificant amounts, under 101.9(f)(4).
The practical error is to drop the fiber line on a low-fiber product and forget the statement. The same-type-size requirement is explicit, so it cannot be set smaller to reclaim panel height.
Soluble and insoluble fiber are voluntary, until they are not
The regulation marks both "Soluble fiber" in 101.9(c)(6)(i)(A) and "Insoluble fiber" in 101.9(c)(6)(i)(B) as voluntary, and most labels declare neither. The exception is written into the same sentence: when a claim is made on the label or in labeling about soluble fiber, declaration of soluble fiber becomes required, and the same applies to insoluble fiber. Putting "with soluble fiber" on the front of the pack is what makes the back-panel line mandatory.
Three constraints follow. First, soluble fiber and insoluble fiber must each meet the definition of dietary fiber in 101.9(c)(6)(i), so a non-qualifying added fiber that happens to be soluble cannot be declared on the soluble fiber line either. Second, both are indented under dietary fiber and expressed to the nearest gram, with the same "Contains less than 1 gram" or "less than 1 gram" alternative below 1 gram and the same option to express as zero below 0.5 gram. Third, the recordkeeping in 101.9(g)(10)(ii) and (iii) applies to each of them when a mixture with non-qualifying added non-digestible carbohydrate is present.
The common mistake is treating the soluble line as a marketing slot. It is a regulated declaration, and once a claim puts it on the panel it is subject to the same compliance sampling as every other declared value. When you are ready to build the panel, the nutrition label generator handles the fiber row end to end: the indentation, the nearest-gram rounding, the percentage against the 28 g Daily Value, and the "Not a significant source of dietary fiber" statement when the fiber line drops out.
Frequently asked questions
What is the Daily Value for fiber on a nutrition label?
28 g for adults and children 4 years and older, and for pregnant and lactating women, under the DRV table in 21 CFR 101.9(c)(9). Labels for children 1 through 3 years use 14 g, and no fiber DRV is established for infants through 12 months. Fiber is a DRV nutrient, so the percentage rounds to the nearest whole percent.
Which added fibers can I count toward the dietary fiber declaration?
Under 101.9(c)(6)(i), the isolated or synthetic non-digestible carbohydrates that FDA has determined to have beneficial physiological effects, and which must therefore be included in the fiber calculation, are beta-glucan soluble fiber as described in 101.81(c)(2)(ii)(A), psyllium husk as described in 101.81(c)(2)(ii)(B)(1), cellulose, guar gum, pectin, locust bean gum and hydroxypropylmethylcellulose. Fiber that is intrinsic and intact in plants qualifies separately and is not restricted to any list.
My lab reports more fiber than I am allowed to declare. What do I do?
Declare the qualifying fiber only, and keep records of the difference. 101.9(g)(10)(i) requires written records of the amount of added non-digestible carbohydrate that does not meet the definition of dietary fiber whenever it is mixed with qualifying fiber in the food. The non-qualifying material still sits inside total carbohydrate, so it is not lost from the panel, just not broken out on the fiber line.
Do I have to declare fiber if there is less than 1 gram per serving?
No. Below 1 gram, declaration is not required. You may instead use "Contains less than 1 gram" or "less than 1 gram," and below 0.5 gram you may express the content as zero. If you omit the line, 101.9(c)(6)(i) requires "Not a significant source of dietary fiber" at the bottom of the table of nutrient values in the same type size, except where the simplified format in paragraph (f) applies.
When do I have to declare soluble or insoluble fiber?
Both are voluntary, except that a claim about soluble fiber on the label or in labeling makes the soluble fiber declaration required, and the same for insoluble fiber. Each must meet the dietary fiber definition in 101.9(c)(6)(i), each is indented under dietary fiber, and each is expressed to the nearest gram with the same below-1-gram alternatives.
How much fiber do I need for a "good source of fiber" claim?
10 to 19 percent of the DRV per reference amount customarily consumed for "good source," "contains" or "provides" under 21 CFR 101.54(c), and 20 percent or more for "high" under 101.54(b), computed from declarable dietary fiber. Under 101.54(d), if the food carrying a high-fiber, good-source-of-fiber or more-fiber claim is not low in total fat, the label must disclose the level of total fat per labeled serving in immediate proximity to the claim, in type no less than half the size of the claim.
Why does an older label show a different fiber percentage for the same grams?
Because the fiber DRV was updated to 28 g in the 2016 revision of the Nutrition and Supplement Facts labels; the previous value was 25 g. The same 3 g of fiber gives 11 percent against 28 g and 12 percent against 25 g. Check which reference value an older artwork file or a competitor's pack was built on before treating the difference as an error.
