Satiety
Slows gastric emptying and increases fullness — a natural amplifier of GLP-1 therapy.
Free Tool · Metabolic HealthFiber intake
Fiber intake
calculator.
Fiber is one of the most underrated levers in metabolic health and sustainable weight loss. Enter a few details to see your personalized daily target.
Your daily target
28g/day
You're about 13g short per day. Small swaps add up fast — see the food list below.
IOM guideline: 25gCalorie-based (14g / 1,000 kcal): 28g
Educational tool. Not medical advice. For a personalized plan, book a consult with Dr. Maalouf.
Why fiber matters
The overlooked lever in weight loss.
Most Americans get about 15g of fiber a day — roughly half of what the body needs. Closing that gap is one of the highest-leverage moves you can make for fat loss, blood sugar, and long-term metabolic health.
Blood sugar
Blunts post-meal glucose spikes, improves insulin sensitivity, and steadies energy.
Gut health
Feeds beneficial bacteria that produce short-chain fatty acids linked to metabolic health.
Longevity
Higher fiber intake is consistently associated with lower cardiovascular and all-cause mortality.
How it works
How this fiber calculator works.
Two methods, and we show you the higher of the two so you aren't undershooting.
1. Guideline target
Institute of Medicine intake: 38g for men under 50, 30g for men 50+, 25g for women under 50, 21g for women 50+.
2. Calorie-based target
14g of fiber per 1,000 calories eaten — this scales with how much food you actually eat.
3. Your gap
We compare your target to your current intake so you know exactly how many grams to add.
4. Ramp slowly
Add about 5g per day each week with extra water. Fast jumps cause bloating, not results.
Fiber counter
High-fiber foods chart.
Grams of fiber per typical serving — use it as a quick fiber counter when you're building meals.
| Food | Serving | Fiber |
|---|---|---|
| Split peas | 1 cooked cup | 16g |
| Lentils | 1 cooked cup | 15g |
| Black beans | 1 cooked cup | 15g |
| Chickpeas | 1 cooked cup | 12g |
| Chia seeds | 2 tbsp | 10g |
| Avocado | 1 medium | 10g |
| Raspberries | 1 cup | 8g |
| Artichoke | 1 medium | 7g |
| Green peas | 1 cooked cup | 7g |
| Flax seeds | 2 tbsp | 6g |
| Pear (with skin) | 1 medium | 6g |
| Blackberries | 1 cup | 6g |
| Broccoli | 1 cooked cup | 5g |
| Brussels sprouts | 1 cooked cup | 4g |
| Oats | ½ cup dry | 4g |
| Sweet potato (with skin) | 1 medium | 4g |
| Almonds | 1 oz | 4g |
| Apple (with skin) | 1 medium | 4g |
| Quinoa | 1 cooked cup | 5g |
| Whole-wheat bread | 2 slices | 4g |
| Navy beans | 1 cooked cup | 19g |
| Edamame | 1 cooked cup | 8g |
| Psyllium husk | 1 tbsp | 7g |
| Wheat bran | ¼ cup | 6g |
| Pumpkin seeds | 1 oz | 5g |
| Barley | 1 cooked cup | 6g |
| Pistachios | 1 oz | 3g |
| Kale | 1 cooked cup | 3g |
| Carrots | 1 cooked cup | 5g |
| Blueberries | 1 cup | 4g |
| Orange | 1 medium | 3g |
| Popcorn (air-popped) | 3 cups | 4g |
Fiber pairs with protein as the two biggest satiety levers — especially on GLP-1 therapy. Set that number too with our protein intake calculator, or read how we use both in our approach to metabolic care.
Soluble vs. insoluble
The two kinds of fiber, and why both matter.
Most whole plant foods contain both, but they do different jobs — and if you're on a GLP-1, the balance between them changes how you feel day to day.
Soluble fiber
Dissolves into a gel: oats, beans, lentils, chia, psyllium, apples, citrus. It slows gastric emptying, lowers LDL cholesterol, and flattens post-meal glucose spikes. This is the fraction that does most of the metabolic work.
Insoluble fiber
Doesn't dissolve: wheat bran, vegetable stalks, nuts, seeds, fruit and potato skins. It adds bulk and speeds transit, which is what relieves the constipation many people get on semaglutide or tirzepatide.
A practical split is roughly one-third soluble to two-thirds insoluble, which happens naturally if you eat beans, oats, berries, and vegetables with the skins on. If you're managing GLP-1 side effects, weight the mix toward soluble fiber first and increase water — details in our guide to GLP-1 side effects. To see how much weight loss to expect on therapy, try the GLP-1 weight loss calculator.
FAQ
Fiber, answered.
The Institute of Medicine recommends 38g/day for men under 50, 30g/day for men 50+, 25g/day for women under 50, and 21g/day for women 50+. A simpler rule: 14g per 1,000 calories.
Yes. Fiber slows digestion, blunts blood sugar spikes, and increases satiety — all of which support fat loss and improved appetite control, including alongside GLP-1 medications.
It gives a well-validated starting target from published intake guidelines — an estimate, not a diagnosis. If you have IBS, diverticular disease, or a history of bowel surgery, set your target with your physician.
Whole-food fiber is almost always the better first move. Supplements like psyllium can bridge the gap, but they don't replace the wider benefits of eating actual plants.
Aim for 25–38g a day, and ideally 30–40g if fat loss is the goal. Trials that raised fiber to roughly 30g/day produced meaningful weight loss even without other diet changes, mostly through greater fullness and steadier blood sugar.
Soluble fiber (oats, beans, chia, psyllium, apples) gels and slows digestion, lowering cholesterol and glucose spikes. Insoluble fiber (bran, vegetables, nuts, skins) adds bulk and speeds transit, which is what helps constipation.
Slowly. Add 5g per day each week, with plenty of water, to avoid bloating and GI discomfort.
The same target, but ramp even more gradually — GLP-1s already slow gastric emptying, so a fast fiber jump can worsen nausea and constipation. See our guide to GLP-1 side effects.
Ready to go deeper?
Nutrition, dialed in for your body.
A fiber target is a start. Real fat loss comes from a full plan — labs, medication when it helps, and nutrition designed around your life.
Book a free consult