GLP-1 Fiber Intake Calculator
Calculate your daily fiber goal with food examples
This calculator estimates your daily fiber goal using established nutrition guidelines and shows high-fiber foods to help you reach your target — useful for supporting bowel regularity while on GLP-1 medications.
Fiber Intake Calculator
How to Use This Calculator
Enter your age and sex
We use guideline-based fiber targets that vary by age and sex.
Get your fiber goal + food examples
You'll see your daily fiber target and a list of high-fiber foods to help you reach it.
Frequently Asked Questions
Answers about fiber intake, GLP-1 constipation, and how to increase fiber safely.
What is the GLP-1 Fiber Intake Calculator?
It estimates a daily fiber goal using established nutrition guidelines and shows high-fiber foods to help you reach your target. The calculator uses age and sex to determine your target based on National Academy of Medicine recommendations.
Why does fiber matter when I'm on GLP-1 medication?
Constipation can happen on GLP-1 therapy, and expert consensus recommends increasing water and fiber intake and mobility to help. Adequate fiber supports bowel regularity and may help manage GI side effects.
How much fiber do I need per day?
Common guideline targets (National Academy of Medicine) are 25 g/day for women ≤50 and 38 g/day for men ≤50, with slightly lower targets after age 50 (21 g/day for women, 30 g/day for men).
Soluble vs insoluble fiber: what's the difference?
Soluble fiber dissolves in water and forms a gel, which can help stool consistency. Insoluble fiber adds bulk and helps move things through. Both can help with regularity, but tolerance varies — increase gradually regardless of type.
Should I increase fiber quickly to fix constipation?
Usually no — increasing too fast can cause gas, bloating, and cramping. Add fiber gradually (about 3 g every 3–4 days) and drink fluids to help fiber work properly. If constipation is severe, talk to your clinician.
Do fiber supplements count?
Yes, fiber supplements can help some people. GI guidelines support fiber supplementation for chronic constipation, and some evidence highlights psyllium as a helpful option. Talk to a clinician or pharmacist if you're unsure which supplement is right for you.
What foods are high in fiber?
Good sources of fiber include:
- Beans and legumes (lentils, chickpeas, black beans)
- Whole grains (oats, quinoa, whole wheat bread)
- Vegetables (broccoli, carrots, Brussels sprouts)
- Fruits (apples, pears, berries, oranges)
- Nuts and seeds (almonds, chia seeds, flaxseed)
Start with foods you tolerate well and increase portions gradually.
Data Sources
This calculator uses evidence-based recommendations from the following sources:
- Mayo Clinic — Dietary fiber: Essential for a healthy diet — age/sex fiber targets (25/21 women; 38/30 men)
- Academy of Nutrition and Dietetics — Position paper on dietary fiber — Adequate Intake concept: 14 g/1,000 kcal; 25 g women; 38 g men
- Mayo Clinic — High-fiber foods — guidance to increase fiber gradually and drink fluids
- GLP-1 GI Adverse Events Expert Consensus (2022) — Constipation guidance: increase water, fiber, and mobility; water reduction can contribute
- ACG/AGA Constipation Guideline — Supports fiber supplementation in chronic idiopathic constipation
- PMC Fiber Supplements Review — Notes psyllium can increase stool water and improve constipation symptoms
- USDA FoodData Central — Fiber content per serving for common foods
⚠️ Important Medical Disclaimer
This calculator is for informational purposes only and does not constitute medical advice. Always consult with your healthcare provider before making any changes to your medication dosing.
Dosage calculations should be verified by a healthcare professional. Glapp and its contributors assume no liability for medication dosing errors or adverse events.
Off-Label Use Notice: Split dosing features represent off-label use not approved by the FDA. Discuss with your prescriber before implementing.