If someone told you there was a supplement that could modestly lower LDL cholesterol, slow down blood sugar rises after meals, and feed the beneficial bacteria in your gut — all at the same time — you'd probably assume it was expensive, hard to find, or reserved for people with serious health conditions. But it isn't any of those things. It's soluble fibre. And many people in Singapore may not be getting as much of it as they need.
Fibre comes in two main forms: insoluble (the kind that adds bulk and keeps things moving) and soluble (the kind that dissolves in water and forms a thick gel in your digestive tract). It's that gel-forming ability that makes soluble fibre so interesting.
Glucomannan is one of the most studied forms — derived from the konjac plant, it has an exceptionally high gel-forming capacity. Psyllium husk is another well-known source. Both are widely available as supplements in health stores across Singapore and Malaysia.
Here's a simple way to think about it. Your liver uses cholesterol to make bile acids, which help you digest fat. After doing their job, most of those bile acids get reabsorbed and recycled. Soluble fibre disrupts that recycling process — it binds to bile acids in your gut and carries them out of your body. Your liver then has to pull more cholesterol from your blood to make new bile acids, which can help lower circulating LDL levels.
Research suggests that regular soluble fibre intake can produce small to modest reductions in LDL cholesterol. It isn't a replacement for medical care, but it can be a helpful addition to other dietary changes.
If you're eating at hawker centres most days and your kopitiam breakfast is kaya toast and a teh tarik, that's likely a low-fibre, high-glycaemic start to the day. The Screen for Life programme includes cholesterol screening, and soluble fibre is one of several dietary tools that may modestly help.
When soluble fibre forms that gel in your stomach, it slows the rate at which food moves into your small intestine. That means glucose from your meal enters your bloodstream more gradually, which may give a flatter, more stable blood sugar curve rather than a sharp spike followed by a crash.
This may matter even if you don't have diabetes. That post-lunch slump you feel after a plate of char kway teow or economy rice? It may be partly down to big swings in blood sugar, though plenty of other things can cause it too. High blood sugar after meals has also been linked to inflammation and greater demand on insulin over time.
Research on glucomannan specifically is mixed. Some reviews suggest it may lower fasting blood glucose, but its effect on blood glucose right after meals is less clear. Soluble fibre generally seems to work best when taken together with a meal.
Soluble fibre isn't just a mechanical tool — it's food for your gut bacteria. Once it reaches your colon, beneficial bacteria ferment it and produce short-chain fatty acids (SCFAs). These SCFAs — particularly butyrate — are the preferred energy source for the cells lining your colon, and they may also help regulate inflammation.
A healthier gut microbiome has been linked to better immune function, lower inflammation, and better metabolic outcomes. Different types of fibre appear to shape gut bacterial communities in different ways.
If you eat out two to three times a day, with food court meals that are fairly light on vegetables, you may well be giving your gut bacteria less fibre than they would like.
Partly, it's perception. Soluble fibre supplements don't have the glamour of omega-3s or the buzz of berberine. They're not particularly exciting to market. And because fibre is associated with "digestive health" in most people's minds, its broader metabolic benefits tend to get overlooked.
There's also a texture and convenience issue. Psyllium husk in a glass of water isn't exactly thrilling. Glucomannan capsules are easier for most people to manage, although long-term research on glucomannan is still limited.
People with elevated LDL cholesterol, blood sugar swings, or a gut that's been neglected by a low-fibre diet may benefit. For the kiasu Singaporean who wants to optimise everything — productivity, energy, long-term health markers — this is a simple, affordable and often overlooked option worth discussing with a healthcare professional.
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any new supplement, especially if you have an existing health condition or are taking medication.
Ask Elaine how this applies to your goals and routine — free, no pressure.