Fiber Analyzer
Search any packaged food for its real fiber content and build a day that hits your fiber goal.
Precision Fitness Calculators
Search any packaged food for its real fiber content and build a day that hits your fiber goal.
Common foods are built in and search instantly; anything else is looked up live in Open Food Facts.
Scientific Reference
Fiber is the single most under-eaten nutrient in Western diets — most adults get roughly half of what is recommended. This tool pulls live nutrition data from the open-source Open Food Facts database and grades each food on two evidence-based measures of carbohydrate quality.
How Foods Are Graded
- Carbohydrate-to-fiber ratio ≤ 10:1 — a validated marker for identifying genuinely whole-grain foods. In a cohort analysis, grain foods meeting this ratio were associated with better cardiometabolic risk profiles than those meeting whole-grain labeling claims alone.
- 14 g of fiber per 1,000 calories — the Institute of Medicine adequate-intake benchmark, which works out to about 25 g/day for women and 38 g/day for men. Foods clearing both bars earn the Fibermaxxing badge.
Why Fiber Matters
- A meta-analysis of prospective cohorts found each additional 10 g/day of fiber was associated with roughly a 10% lower risk of all-cause mortality.
- The Lancet 2019 series identified 25–29 g/day as the intake range linked to the largest reductions in cardiovascular disease, type 2 diabetes and colorectal cancer.
- Fiber increases satiety per calorie, which is why high-fiber foods make a calorie deficit easier to sustain.
Open Food Facts entries are crowd-sourced. Coverage of packaged products is excellent but individual entries can be incomplete or out of date — treat the numbers as a guide and check the label on the packet.
Sources: 10:1 Carbohydrate-to-Fiber Ratio (PubMed) · Fiber Intake & Total Mortality Meta-Analysis (PubMed) · Carbohydrate Quality & Human Health, Lancet 2019 (PubMed) · Open Food Facts (Open Database License)
Fiber: the most under-eaten nutrient
Most adults eat roughly half the recommended fiber. The evidence for closing that gap is unusually strong: a meta-analysis of prospective cohorts found each additional 10 g of daily fiber associated with about a 10% reduction in all-cause mortality, and the Lancet 2019 carbohydrate-quality series identified 25–29 g/day as the range linked to the largest reductions in cardiovascular disease, type 2 diabetes and colorectal cancer. For fat loss specifically, fiber buys satiety per calorie — high-fiber meals keep a deficit livable.
This analyzer searches the open-source Open Food Facts database by product name or barcode, so the numbers come from real packaged foods rather than idealized tables. Add foods to "Today's Plate" with your actual gram amounts and watch the running total against your daily goal.
The two grades every food gets
Marketing says "whole grain"; the label math says otherwise. Each food is graded on two evidence-based tests. First, the carbohydrate-to-fiber ratio: foods at or below 10 g of total carbs per 1 g of fiber track genuinely whole-grain products, and cohort data links foods meeting this 10:1 ratio to better cardiometabolic profiles than label claims alone. Second, fiber density: at least 14 g of fiber per 1,000 calories, the Institute of Medicine adequate-intake benchmark. Foods clearing both bars earn the Fibermaxxing Approved badge.
Practical use: audit your default breakfast and snacks first — that is where refined carbs hide behind healthy branding. Crowd-sourced entries can be incomplete, so the analyzer excludes items with missing data from your totals and tells you, rather than silently counting them as zero. Save each day's total to the progress tracker and aim for the 25–38 g range (women/men) rather than perfection on any single day.
Closing a fiber gap is usually about swaps rather than additions. Moving from white rice to brown or to millet, from refined roti to whole wheat or bajra, and from juice to whole fruit typically adds 10–15 g a day without changing what a meal looks like. Legumes do the heaviest lifting in a South Asian diet — a single cup of cooked rajma, chana or moong dal carries 12–15 g, which is close to half a day's target from one component of one meal. Increase gradually, roughly 5 g per week, and raise water intake alongside it: fiber works by absorbing water, and adding it to a dry diet is what produces the bloating people blame on the fiber itself.
Frequently Asked Questions
How much fiber should I eat per day?
The Institute of Medicine benchmark is 14 g per 1,000 calories — roughly 25 g/day for women and 38 g/day for men. The Lancet 2019 analysis found 25–29 g/day associated with the largest disease-risk reductions.
What is the 10:1 carb-to-fiber rule?
Divide total carbohydrates by fiber: 10 or less marks a genuinely whole-grain food. A bread with 20 g carbs and 3 g fiber scores 6.7:1 and passes; one with 22 g carbs and 1 g fiber fails regardless of what the packaging claims.
Can I eat too much fiber?
Going from low to high intake overnight causes bloating and cramping. Increase by about 5 g per week and drink more water alongside it. Intakes up to 50 g/day are well tolerated once the gut microbiome adapts.
Why do some foods show as incomplete?
Open Food Facts is crowd-sourced, and some entries lack fiber or calorie data — or carry obviously wrong units, which the analyzer rejects. Incomplete items are flagged and excluded from your plate totals instead of being silently counted as zero.