Top Apps to Track Fiber Intake
App guide
Ranked & compared
Cronometer tracks fiber from lab-verified data on its free tier — the most accurate option; MyFitnessPal covers fiber free but accuracy varies; MacroFactor and Yazio add adaptive targets and fasting support respectively.
Tracking fiber is a practical way to manage the constipation and reduced satiety that often accompany GLP-1 medications. The Dietary Guidelines recommend 14 grams of fiber per 1,000 calories consumed, a target that becomes harder to hit when total food intake drops. We evaluated the top apps based on data accuracy, free-tier access, and how well they support someone eating smaller volumes on a GLP-1 prescription.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Fiber intake is directly linked to two of the most common GLP-1 side effects: constipation and inadequate satiety between meals. The 2020–2025 Dietary Guidelines (via Mayo Clinic) recommend 14 g of fiber per 1,000 calories — giving a concrete numerical target. Tracking fiber helps GLP-1 users who eat less food make sure they're still hitting that ratio.
How we evaluated them
Evaluated on: whether fiber is tracked on the free tier; data accuracy (lab-verified vs. user-submitted); soluble vs. insoluble fiber visibility; price transparency; platform availability; and practical utility for GLP-1 constipation management.
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
Cronometer
Free / Gold $49.99/yr (about $8.99/mo)iOS / Android / WebBest for: Accurate fiber tracking toward a daily target
- Fiber tracked on free tier from lab-verified data
- Manual logging can be slow
MyFitnessPal
Free / Premium $19.99/mo or $79.99/yriOS / Android / WebBest for: Everyday fiber logging with a big database
- Fiber in nutrient dashboard
- Easy meal copying
- Fiber accuracy depends on user-submitted entries
MacroFactor
$11.99/mo / $47.99/6-mo / $71.99/yr (no free tier; 7-day trial)iOS / AndroidBest for: Fiber tracking alongside adaptive macro targets
- Verified food database
- Fiber included in nutrient tracking
- No free version
Yazio
Free / Pro $6.99/mo or $47.90/yriOS / AndroidBest for: Fiber and macro tracking with fasting support
- Fiber shown in nutrient breakdown (Pro)
- Free barcode scanning
- Detailed nutrient values gated behind Pro
Why Fiber Tracking Is Especially Important on GLP-1 Medications
GLP-1 medications like semaglutide and tirzepatide work partly by slowing gastric emptying — food stays in your stomach longer, which helps you feel full but also slows everything downstream. That deceleration is a feature for appetite control and a bug for bowel regularity. Constipation is one of the most frequently reported side effects in clinical trials, and it doesn't always resolve on its own.
The first-line dietary intervention isn't a laxative — it's fiber. The Dietary Guidelines for Americans recommend 14 grams of fiber per 1,000 calories consumed. On a typical GLP-1 calorie intake of 1,200 to 1,400 calories per day, that translates to a minimum of roughly 17 to 20 grams of fiber daily. When you're eating half the food volume you used to, hitting that number requires intentional food choices.
Fiber also feeds the gut microbiome, which can shift during rapid weight loss. Soluble fiber in particular ferments into short-chain fatty acids that support the gut lining and may improve the metabolic response to food. Tracking fiber isn't just about preventing constipation — it's about preserving gut health while your calorie intake drops.
Bottom line
GLP-1 users who eat 1,400 cal/day need at least 19.6 g fiber — a target that becomes hard to hit when meal volume drops by half.
The 4 Best Apps for Tracking Fiber (Free vs. Paid Breakdown)
Not all food-tracking apps treat fiber the same way. Some pull from lab-analyzed databases where every gram of fiber is verified; others rely on user-submitted entries that can be off by 50% or more. For someone trying to hit a specific fiber target to manage constipation, that accuracy gap matters.
Cronometer is the standout for fiber accuracy on a free tier. It draws from the USDA National Nutrient Database and the NCCDB, both of which use laboratory analysis rather than crowd-sourced estimates. When you log 'black beans, cooked' in Cronometer, the fiber number comes from a chemically analyzed sample, not another user's best guess. The free version shows total fiber; the Gold tier ($49.99/year) breaks it into soluble and insoluble fractions.
MyFitnessPal has the largest food database by far, and fiber appears in the free nutrient dashboard. The catch is that many entries are user-submitted and unverified. A 'green checkmark' entry has been reviewed, but the majority of foods in the database lack that verification. For common whole foods, the numbers are usually close enough. For packaged products or restaurant meals, the fiber count can be missing or wrong.
MacroFactor is a paid-only app ($11.99/month) built around adaptive energy expenditure tracking. Its food database is verified and fiber is included in the nutrient breakdown, but you can't set a standalone fiber target — fiber appears as part of the carbohydrate total. The app adjusts your calorie and macro targets weekly based on your actual weight change, which is useful if your GLP-1 dose is still being titrated and your intake is shifting.
Yazio offers fiber tracking on its free tier but gates the detailed nutrient breakdown behind Pro ($6.99/month). The free version shows calories and macros; Pro unlocks the full micronutrient and fiber dashboard. Yazio's unique angle is integrated intermittent fasting tracking, which some GLP-1 users combine with their medication schedule.
Bottom line
Cronometer is the only free app with lab-verified fiber data; MyFitnessPal is larger but the fiber number is only as accurate as whoever entered the food.
Soluble vs. Insoluble Fiber: Does Your App Track Both?
Fiber isn't one thing. Soluble fiber dissolves in water to form a gel — it slows digestion, lowers LDL cholesterol, and ferments in the colon to feed beneficial bacteria. Insoluble fiber doesn't dissolve; it adds bulk to stool and speeds transit time through the intestines. Both matter, but for different reasons.
For GLP-1-related constipation, insoluble fiber provides the mechanical bulk that stimulates peristalsis — the muscular contractions that move waste through the colon. Soluble fiber pulls water into the stool, softening it and making it easier to pass. Most people need both, but the balance matters: too much insoluble fiber without enough water can actually worsen constipation.
Here's the problem with most tracking apps: they show total fiber only. Cronometer Gold is the exception — it breaks fiber into soluble and insoluble on its paid tier. MyFitnessPal, MacroFactor, and Yazio all report a single fiber number. That single number is still useful as a daily target, but it won't tell you if you're getting 20 grams of insoluble fiber and almost no soluble, which could leave stools bulky but hard.
If you're using a free app that shows only total fiber, you can roughly estimate the split: oats, barley, beans, apples, and citrus are soluble-fiber-dominant; wheat bran, vegetables, nuts, and seeds lean insoluble. Psyllium husk — the active ingredient in Metamucil — is about 70% soluble fiber, which is why it's often recommended for both constipation and cholesterol management.
Bottom line
Most consumer apps show only total fiber; Cronometer Gold distinguishes soluble/insoluble — worth knowing if constipation is your specific GLP-1 issue.
High-Fiber Foods That Work When You're Not Hungry
The core challenge of eating enough fiber on a GLP-1 medication is that you're simply not eating very much. A standard recommendation to 'eat more whole grains and vegetables' assumes you have the appetite for large portions. When a full meal is half a cup of food, you need fiber-dense choices — foods that deliver the most grams of fiber per bite.
Chia seeds are the most fiber-dense food widely available: roughly 10 grams of fiber per 28-gram serving (two tablespoons), almost all of it soluble. They absorb liquid and form a gel, which makes them useful for thickening smoothies or making a simple pudding. Lentils deliver about 15.6 grams of fiber per cooked cup — one of the highest legume fiber counts — and work in soups or as a small side. A single avocado contains around 10 grams of fiber, with a roughly even split between soluble and insoluble. Raspberries pack 8 grams of fiber per cup, more than any other common berry.
When logging these foods, weigh them. A 'medium avocado' is a vague measurement that can vary by 100 calories and several grams of fiber. A 'cup of lentils' depends on how tightly they're packed. Cronometer and MacroFactor both default to gram-weight entries, which are more accurate. MyFitnessPal has gram options but often surfaces '1 serving' or '1 cup' as the default — switch to grams when you can.
Fiber supplements like psyllium husk are a pragmatic backup, not a replacement for food. Psyllium provides about 6 grams of fiber per tablespoon, nearly all soluble, and is well-studied for constipation. But whole foods bring polyphenols, minerals, and other compounds that a supplement doesn't replicate. Log the supplement in your app the same way you'd log a food — most apps have psyllium in their database.
Bottom line
Chia seeds (10 g fiber per 28 g serving) and lentils (15.6 g per cooked cup) give the highest fiber density when total food volume is limited — but log them by weight, not volume, for accuracy.
Setting Up a Fiber Goal in Your Tracking App
Most apps don't surface a fiber target by default — you have to set it yourself. The process varies by app, but the math is the same: multiply your daily calorie target (in thousands) by 14. If you're eating 1,400 calories, your fiber floor is 19.6 grams. If you're eating 1,200, it's 16.8 grams. Set this as a minimum, not a ceiling.
In Cronometer, go to Profile → Targets → Fiber and enter your number. The free tier lets you set a fixed gram target. The Gold tier also lets you set targets for soluble and insoluble fiber separately. Cronometer's dashboard will show your progress toward the target as a percentage bar, which is more glanceable than a raw number.
In MyFitnessPal, fiber isn't a default dashboard nutrient. Go to More → Nutrition → Nutrients, then tap 'Fiber' to add it to your tracked nutrients. You can set a custom goal under Goals → Additional Nutrient Goals. The free version allows this, but the interface is buried — most users never find it.
In Yazio, fiber tracking is available on the free tier but the target-setting feature requires Pro. If you're on the free plan, you can still see your daily fiber total in the nutrient tab and manually compare it to your target. MacroFactor doesn't allow a standalone fiber target — fiber is tracked as part of carbohydrates, and the app's adaptive algorithm adjusts your total carb goal based on your weight trend and preferences.
Bottom line
In Cronometer, go to Profile → Targets → Fiber — set it to 14 g × your daily 1,000-cal increments; in MyFitnessPal, add fiber to your nutrient dashboard under More → Nutrients.
What most pages leave out
Most apps don't separate soluble from insoluble fiber, which matters for different GI issues (soluble for softer stools and microbiome; insoluble for bulk and transit speed). Logging 'fiber' as a single number is a reasonable proxy but misses this nuance. Competitors rarely flag this limitation.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
The Dietary Guidelines recommend 14 grams of fiber per 1,000 calories consumed. On a typical GLP-1 intake of 1,400 calories per day, that means a minimum of about 19.6 grams of fiber daily. If you're eating 1,200 calories, aim for at least 16.8 grams.
Yes — fiber appears in the free nutrient dashboard. However, the accuracy of the fiber count depends on the quality of the database entry you select. User-submitted entries may be missing fiber data or contain inaccurate values, so look for green-checkmarked verified entries when possible.
Cronometer is the most accurate because it uses lab-analyzed data from the USDA National Nutrient Database and the NCCDB rather than user-submitted entries. Every fiber value in Cronometer comes from a chemically analyzed food sample, not crowd-sourced estimates.
Yes — fiber is the first-line dietary intervention for GLP-1-related constipation. Soluble fiber from foods like psyllium, oats, and chia seeds softens stools by drawing in water, while insoluble fiber adds bulk that stimulates gut motility. Aim for 14 grams per 1,000 calories before reaching for laxatives.
Chia seeds deliver about 10 grams of fiber per 28-gram serving (two tablespoons). Lentils provide roughly 15.6 grams per cooked cup. A whole avocado has around 10 grams, and raspberries pack 8 grams per cup. These foods give you the most fiber per bite when total meal volume is limited.
Yes — but only on the Gold paid tier ($49.99 per year). The free tier shows total fiber only. If you need to distinguish between soluble and insoluble fiber to fine-tune your constipation management, the Gold upgrade is worth considering.
Apps track total carbohydrates and fiber as separate fields. Net carbs are calculated as total carbs minus fiber, because fiber is not absorbed for energy. This means fiber effectively subtracts from your digestible carbohydrate total — a useful distinction if you're also monitoring blood sugar.
Multiply 14 grams by 1.2 (for 1,200 calories) and you get 16.8 grams of fiber per day minimum. That's challenging to hit on a low-calorie intake, which is why fiber-dense foods like chia seeds and lentils are more practical than trying to eat large volumes of vegetables.
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Read moreOn a GLP-1, or thinking about one?
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This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.