Fibre and cholesterol: the short version
If you want to look after your cholesterol, fibre deserves a spot at the top of your list. Soluble fibre, and psyllium husk in particular, is one of the best-researched food-based ways to help lower "bad" LDL cholesterol.
Heart disease remains one of the leading causes of death worldwide, and elevated cholesterol is one of its key risk factors. The good news is it's one your diet can genuinely influence.
How soluble fibre lowers cholesterol
Soluble fibre works by catching cholesterol-rich bile in your gut and carrying it out of the body. It dissolves in water and forms a gel-like texture, which is what makes it so useful for lowering cholesterol and keeping blood sugar steady.
Here's how it works:
1. Your liver uses cholesterol to make bile acids, which it sends into your gut to help digest fats.
2. Normally, most of those bile acids are reabsorbed and recycled.
3. Soluble fibre like psyllium binds bile acids in the digestive tract, so more of them leave the body instead.
4. To replace them, your body draws cholesterol out of circulation to make fresh bile acids.
5. The result is lower LDL cholesterol in your blood (Reynolds et al., 2022).
It's worth knowing which fibre does what. Insoluble fibre (think wheat bran) adds bulk and keeps things moving, but it's the gel-forming soluble fibres that do the heavy lifting on cholesterol.
Why psyllium stands out
Psyllium husk is one of the most studied fibres for cholesterol, and the evidence is consistent. High cholesterol is one of the recognised reasons to consider adding psyllium to your routine (Dahl & Stewart, 2015).
"Psyllium is one of the most well-researched and effective fibre supplements for improving digestive regularity and heart health."
Monica Jaques, Registered Dietitian
Here's what the research shows:
- It lowers LDL when taken regularly. A 2023 systematic review and dose-response meta-analysis of randomised controlled trials found beneficial effects of psyllium on cardiovascular disease and its risk factors (Gholami & Paknahad, 2023).
- The effect holds up long term. Long-term psyllium use alongside diet therapy for high cholesterol showed lasting cholesterol-lowering effects (Anderson et al., 2004).
- It improves cholesterol markers in clinical trials, alongside post-meal blood glucose (Nitzke et al., 2024).
- It's part of a bigger fibre story. A systematic review of dietary fibre in hypertension and cardiovascular disease management supports fibre's role in heart health (Reynolds et al., 2022).
The bigger picture is just as compelling. A landmark 2019 review in The Lancet found people eating the most fibre had a 15 to 30% lower risk of dying from any cause, including heart disease, with the biggest gains seen at 25 to 29 grams a day (Reynolds et al., 2019).
Psyllium is also gentler than many other fibres. It ferments more slowly, so it tends to cause less gas than fibres like inulin, while still forming the gel that does the cholesterol work.
Does psyllium support heart health beyond cholesterol?
Cholesterol is where the evidence is strongest, but it doesn't stop there. Research indicates psyllium may also support healthy blood pressure and reduce markers of inflammation (Chen et al., 2022; Clark et al., 2020; Kassa et al., 2024). Both matter for long-term cardiovascular health.
Dietary fibre intake more broadly is associated with modest reductions in blood pressure and improved vascular function (Reynolds et al., 2022), and with reduced risk of heart disease, stroke and type 2 diabetes (Reynolds et al., 2019). Psyllium is one of the most concentrated and well-researched fibre sources available.
Where to find soluble fibre in food
Whole foods come first. Soluble fibre is found in oats, barley, legumes, apples, flaxseed and psyllium. Easy ways to boost your fibre overall:
- Legumes: lentils, chickpeas and beans are fibre powerhouses. Add them to soups, salads and curries.
- Wholegrains: oats, wholemeal bread, grainy crackers, quinoa and brown rice.
- Fruit and veg: aim for 7+ servings a day and keep the skin on where you can.
- Nuts and seeds: a small handful of unsalted mixed nuts, or pumpkin and chia seeds over yoghurt or porridge.
The catch is that most of us fall short. New Zealand's Nutrient Reference Values recommend at least 25g a day for women and 30g for men (NHMRC & NZ Ministry of Health, 2006), yet University of Otago research puts median intake at just 17.5g for women and 22.1g for men. Hitting 25g from food alone looks like roughly 8 apples, or 5 cups of broccoli, in a day.
That's where No.2 can help close the gap. No.2 is not only great tasting it also has a high percentage of psyllium husk, no added sugars or artificial sweeteners. 3 serves a day will give you just under 10g of dietary fibre.
Getting the most from your No.2
The cholesterol benefits come from taking psyllium regularly, around mealtimes, with plenty of water. A few tips to put that to work:
- Take it with or before a meal. Psyllium binds cholesterol-rich bile in your gut, so taking it around mealtimes, as part of a balanced diet, puts it right where it's needed.
- Be consistent. Your gut thrives on routine, and the research showing lower LDL is based on regular use (Anderson et al., 2004). Make your No.2 a daily habit.
- Start low and build up. Begin with ½ to 1 teaspoon and increase by ½ teaspoon every few days. This gives your gut time to adjust and keeps bloating at bay.
- Drink plenty of water. Psyllium absorbs water to form its gel. Without enough fluid it can cause or worsen constipation, so aim for around 1.5 to 2 litres a day.
- Check in if you're on medication. Speak with your GP or dietitian before starting psyllium if you take medications, especially for diabetes or heart conditions.
"Your gut doesn't need you to get it perfect. It needs you to be kind, consistent, and flexible."
Monica Jaques, Registered Dietitian
The bottom line
Soluble fibre is one of the simplest, best-evidenced ways to support healthy cholesterol, and psyllium husk leads the pack. Build your diet around fibre-rich whole foods, then use a high-purity psyllium like No.2 Good Gut Fibre to help close the gap, every day.
As always, we advise talking to a health professional if you have any concerns about your health, including your cholesterol. This article is not intended as medical advice, and No.2 is not a replacement for any cholesterol medication you've been prescribed.
References
1. Anderson, J. W., et al. (2004). Long-term cholesterol-lowering effects of psyllium as an adjunct to diet therapy in the treatment of hypercholesterolemia. The American Journal of Clinical Nutrition, 80(6), 1466–1472. https://doi.org/10.1093/ajcn/80.6.1466
2. Chen et al. (2022). [Full citation to add]
3. Clark et al. (2020). [Full citation to add]
4. Dahl, W. J., & Stewart, M. L. (2015). Position of the Academy of Nutrition and Dietetics: Health implications of dietary fiber. Journal of the Academy of Nutrition and Dietetics, 115(11), 1861–1870. https://doi.org/10.1016/j.jand.2015.09.003
5. Gholami, Z., & Paknahad, Z. (2023). The beneficial effects of psyllium on cardiovascular diseases and their risk factors: Systematic review and dose–response meta-analysis of randomized controlled trials. Journal of Functional Foods, 108, 105859. https://doi.org/10.1016/j.jff.2023.105859
6. Kassa et al. (2024). [Full citation to add]
7. National Health and Medical Research Council (Australia), New Zealand Ministry of Health. (2006). Nutrient Reference Values for Australia and New Zealand. Canberra: NHMRC.
8. Nitzke, D., et al. (2024). Increasing dietary fiber intake for type 2 diabetes mellitus management: A systematic review. World Journal of Diabetes, 15(5), 1001–1010. https://doi.org/10.4239/wjd.v15.i5.1001
9. Reynolds, A., Mann, J., Cummings, J., Winter, N., Mete, E., & Te Morenga, L. (2019). Carbohydrate quality and human health: A series of systematic reviews and meta-analyses. The Lancet, 393(10170), 434–445. https://doi.org/10.1016/S0140-6736(18)31809-9
10. Reynolds, A. N., Akerman, A., Kumar, S., Diep Pham, H. T., Coffey, S., & Mann, J. (2022). Dietary fibre in hypertension and cardiovascular disease management: Systematic review and meta-analyses. BMC Medicine, 20(1), 139. https://doi.org/10.1186/s12916-022-02328-x
