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If fibre leaves you gassy or bloated, the type of fibre and how quickly you add it may matter as much as the total amount. Oats, psyllium and linseeds are options some people with IBS tolerate better, but none is guaranteed to be symptom-free. Start with a small change, increase gradually and track your response.
Why fibre can cause gas and bloating
Fibre is not one uniform substance. Different types have different effects: some add bulk, some form a gel, and some are fermented by gut bacteria. Rapidly fermented fibres can produce gas, and a sudden jump in total fibre can also bring on symptoms. Monash University explains that FODMAP carbohydrates can draw water into the intestine and be fermented, producing gas; for some people with IBS, the resulting water and gas can contribute to pain, bloating or altered bowel habits. Other people tolerate the same foods without symptoms.
This is why replacing one fibre source with another may help some people, while simply adding more fibre may not. Wheat bran, inulin, and fibres such as FOS and GOS can be troublesome for some people with IBS, but they are not universally unsuitable. Use your own symptom pattern and, where needed, professional guidance rather than treating any food as a blanket prohibition.
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Fibre options to consider
The options below differ in food form, likely fermentation and the symptoms they may help. Evidence and individual tolerance vary; introduce one change at a time so you can tell what suits you.
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- Regulating Fiber: With 6 grams of soluble fiber per serving, Sunfiber helps alleviate both occasional constipation and diarrhea by promoting regular, healthy bowel movements*
- Gentle On Your System: Sunfiber ferments slowly in the gut, promoting digestive health without excess gas or bloating;* Our gentle, low FODMAP-certified formula is typically well-tolerated by individuals with sensitive stomachs*
- Enhanced Satiety: Helps slow down gastric transit time for a comfortably full and satiated feeling;* Controls the glycemic index of foods
- Easy to Use: Dissolves fast and clear in your favorite beverage without altering the taste or texture of foods; Mix with your favorite recipes, drinks, smoothies and more to boost your fiber intake
- Prebiotics for Gut Health: Our prebiotic-rich formula feeds the probiotics, promoting healthy gut microbiome;* Helps food move through your system at just the right pace, and supports the absorption of essential minerals*
| Option | What the guidance says | How to approach it |
|---|---|---|
| Oats or oat bran | Monash says they may help constipation, abdominal pain and bloating in IBS, while noting that more studies are needed. Cambridge University Hospitals also lists oats as a fibre source. | Try a modest serving and adjust gradually. Treat oats as an option to test, not a guaranteed remedy. |
| Psyllium | Monash describes psyllium as slowly fermented and less likely to trigger gas accumulation than rapidly fermented fibres. It appears well tolerated by many people with IBS and may be useful for IBS with constipation, but not everyone tolerates it. | If using a supplement, follow its directions and begin with a small dose, increasing slowly over several days. Cambridge University Hospitals also recommends a gradual approach. |
| Linseeds (flaxseed) | Monash reports that up to two tablespoons a day may improve constipation, abdominal pain and bloating, but says more studies are needed. NHS guidance also includes linseeds as an option. | Introduce a small amount first and increase only if tolerated. The reported amount is not a guarantee of benefit for every person. |
| Kiwi | Cambridge University Hospitals includes one to two kiwis per day as an option in its low-FODMAP guidance. | Check current local serving guidance and your individual tolerance; suitability depends on portion and context. |
| Methylcellulose or sterculia | Monash discusses these as non-fermentable or less gas-forming possibilities. | These are supplement options rather than foods; ask a clinician or dietitian whether one is appropriate for you. |
| Partially hydrolysed guar gum (PHGG) | Monash describes preliminary promise; the evidence is not as established as for every other option discussed. | Do not assume it will help or be tolerated; discuss persistent symptoms and supplement choices with a health professional. |
For low-FODMAP planning, serving size and combinations with other foods matter. Monash directs readers to its app for current serving recommendations, so do not assume a food is low-FODMAP in every portion.
Increase fibre slowly
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says: “Adding fiber to your diet slowly, by 2 to 3 grams a day, may help prevent gas and bloating.” This gradual increase is a practical alternative to making a large change all at once. For supplements, Monash likewise advises starting with a small dose and increasing over several days toward the recommended amount.
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- Gentle Stomach Support: This fiber powder is specifically formulated to support digestive health and aid stomach comfort while aligning with low-FODMAP dietary needs
- Supplement Supports Stomach Comfort: To support digestive health, mix 1 serving in 8 fl oz of water or non-carbonated beverage 1–2 times per day or as directed by a physician
- Aids Occasional Gas and Bloating: This health supplement is free from sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, tree nuts, and GMOs
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- Choose one change. Add one food or supplement option rather than changing several fibre sources at once.
- Start small. Follow product directions for supplements, and use a modest food serving.
- Increase gradually. NIDDK’s suggested increment is 2 to 3 grams of fibre per day; adjust more cautiously if symptoms appear.
- Notice your response. Track the option, serving and symptoms so you can identify patterns rather than attributing a change to several foods at once.
Ask a clinician or dietitian for advice if symptoms are persistent or severe, or if you have a medical condition that could affect which fibre or supplement is suitable.
How low-FODMAP eating fits in
A low-FODMAP diet is not intended as a permanent elimination plan. Cambridge University Hospitals describes a restriction phase followed by gradual reintroduction and advises dietitian guidance. Monash describes an initial high-restriction phase of 2–6 weeks before transition to reintroduction. The point is to identify personal triggers and expand food choices where possible, not to avoid a broad list indefinitely.
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- GENTLE GUT SUPPORT –Bluebonnet’s Sunfiber Powder delivers 6 grams of plant-based dietary fiber from partially hydrolyzed guar gum to help support bowel regularity while also providing prebiotic benefits for gastrointestinal health. This soluble and slow-fermenting fiber is well tolerated and suitable for those following a low-FODMAP diet.*
- PREBIOTIC BENEFITS– Adding prebiotic fiber to your diet stimulates the growth of good bacteria so they can thrive and also suppresses the growth of bad bacteria, promoting an optimal environment for good digestive health, all the while easing bloating and gas. *
- PLANT-BASED SOLUBLE FIBER - Bluebonnet’s Sunfiber Powder delivers 6 grams of soluble and slow-fermenting plant-sourced fiber that is highly absorbable and bioavailable! This unflavored, colorless, and odorless plant based prebiotic soluble fiber dissolves instantly with water or any liquid, making it a breeze to support your digestion with your favorite beverage! *
- ONLY THE BEST INGREDIENTS - Made with premium raw materials to produce high quality supplements for maximum bioavailability and absorption to help achieve the desired health benefits. Each ingredient in our formulas has undergone analytical testing to verify they meet specifications for identity, purity, and potency.
- ECO-FRIENDLY PRODUCTS - Bluebonnet works directly with growers, farmers and suppliers to ensure you and your family will get the best whole-food ingredients possible. This product is Non-GMO Project Verified, Low-FODMAP Certified, Vegan, Kosher Certified, Gluten-Free, Soy-Free, Milk-Free and more! Made without artificially derived colors, flavors or sweeteners and unnecessary binders, fillers or additives to maintain nutrient integrity. Delivered in recyclable packaging.
Because portions and combinations affect FODMAP content, use current local clinical guidance or Monash’s current serving recommendations rather than relying on a generic food list. A dietitian can help make the restriction and reintroduction phases more individualized.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much fibre to aim for
Monash’s 2021 article reports recommendations of 25 g per day for adult women and 38 g per day for adult men. These are general figures reported by Monash, not an individualized prescription; your needs may differ. The same article reports that 95% of Americans consume less than those recommendations and average intake is 16 g per day. That statistic is specific to the United States and should not be read as a global estimate.
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- Regulating Fiber: With 6 grams of soluble fiber per serving, Sunfiber helps alleviate both occasional constipation and diarrhea by promoting regular, healthy bowel movements*
- Gentle On Your System: Sunfiber ferments slowly in the gut, promoting digestive health without excess gas or bloating;* Our gentle, low FODMAP-certified formula is typically well-tolerated by individuals with sensitive stomachs*
- Enhanced Satiety: Sunfiber has a healthy satiety effect, slowing gastric transit time and increasing satiation hormones, resulting in a comfortably full & satiated feeling*
- Easy to Use: Dissolves fast and clear in your favorite beverage without altering the taste or texture of foods; Mix 1 scoop in water or non-carbonated beverage
- Prebiotics for Gut Health: Our prebiotic-rich formula feeds the probiotics, promoting healthy gut microbiome;* Helps food move through your system at just the right pace, and supports the absorption of essential minerals*
If you are currently eating little fibre, do not try to reach a target overnight. A gradual increase can be more comfortable, particularly if you are prone to gas or bloating.
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Best Value
- 2-in-1 Synbiotic Blend: Contains prebiotic fiber & probiotics to support healthy digestive balance, so you can feel your best from inside and out; Delivers 5g prebiotic fiber & 8 billion probiotics per serving
- Regulating Fiber: With 5 grams of soluble fiber per serving, Sunfiber helps alleviate occasional constipation & diarrhea by promoting regular, healthy bowel movements
- Probiotic Support: Active probiotics (bifidobacterium lactis) work in harmony with the prebiotic Sunfiber fiber to nourish beneficial gut bacteria, promoting a healthier digestive system and improved gut function
- Gentle On Your System: Sunfiber ferments slowly in the gut, promoting digestive health without excess gas or bloating; Our gentle, low FODMAP-certified formula is typically well-tolerated by individuals with sensitive stomachs
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
