Glucomannan: Effects & Benefits
Many people underestimate what fibre can do for them, especially when it comes to weight loss... and therefore don’t eat enough of it. One fibre that’s particularly interesting here is glucomannan. Why it matters and how you can benefit from it — you’ll find out in this blog.
What is Glucomannan?
Glucomannan is a natural, water-soluble dietary fibre derived from the root of the konjac plant (Amorphophallus konjac).
Like most fibres, it has the ability to absorb water, but what makes it special is that glucomannan can absorb up to 50 times its own weight in liquid, giving it the highest water-binding capacity of all fibres. This property makes it a true game-changer in weight management.¹
In general, fibre plays an essential role in overall health. Studies show that average fibre intake in Germany, and globally, is much lower than the recommended amount: about 18 g per day for women and 19 g for men, compared to the recommended 30 g daily.3,4
Glucomannan can be a smart addition to help boost your fibre intake and support long-term benefits, including gut health. Thanks to its prebiotic properties, glucomannan is particularly valuable for digestion.5
How Glucomannan Supports Weight Loss
Glucomannan is the only substance officially approved by the EFSA (European Food Safety Authority) to support weight loss.
According to their claim, glucomannan contributes to weight reduction as part of a calorie-controlled diet1 and helps maintain normal blood cholesterol levels2. These effects are based on its unique properties.
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Satiety and Appetite Control
Because glucomannan binds water, it expands in your stomach to form a gel that creates a feeling of fullness helping reduce food intake naturally. -
Supports Digestive Health
As a dietary fibre, glucomannan promotes healthy digestion.5 Studies show it increases stool volume, supports bowel movement, and can help relieve constipation.5,6 -
Regulates Blood Sugar Levels
Glucomannan may also have a positive impact on fat and glucose metabolism.2 This helps stabilise blood sugar levels,5,7 reducing cravings caused by rapid spikes and crashes in blood sugar.
The positive effects of glucomannan on weight control can only be achieved when combined with a calorie deficit. For glucomannan to work effectively, it’s essential to ensure adequate fluid intake, as water activates its natural swelling effect.
Thanks to these properties, the dietary fibre glucomannan helps you maintain a calorie deficit more easily over time, making it a real game-changer for weight management.
It’s important to remember that these benefits can only occur alongside a calorie deficit.
Always follow the recommended dosage and drink plenty of water to maximise its effectiveness and safety.
Where Can You Find Glucomannan?
Glucomannan is added to various foods to increase their fibre content and provide the proven benefits for satiety and weight management. It also occurs naturally in low-calorie konjac products like noodles or rice and is used in protein products, drinks, and fibre-rich baked goods. This makes it easy to integrate into your daily routine, whether for a longer feeling of fullness, support in a calorie-reduced diet, or simply to increase fibre intake.
How to Take Glucomannan
For best results, take 3 g of glucomannan per day, ideally divided into 3 portions of 1 g each. Consume it with 1–2 glasses of water, so it can expand in your stomach and help you feel fuller for longer, naturally reducing food intake.
Optimal and Safe Amounts
According to the EFSA health claim¹, the recommended effective amount is 3 g per day (3 × 1 g). Studies show that higher doses of up to 10 g per day are considered safe.
If you take a higher single dose, make sure to let the powder absorb water first and drink plenty of fluids. Taking 4–5 g throughout the day? No problem. A single 3 g dose? Also safe.
Is Glucomannan Safe? Are There Any Side Effects?
Glucomannan is considered safe and is widely used in food and dietary supplements.
However, a few things are important to avoid discomfort:
- Drink enough fluids.
Glucomannan expands strongly in the stomach, so always take it with plenty of water. Too little fluid can cause digestive issues. -
Mild digestive symptoms at first.
Some people may experience bloating or a feeling of fullness when starting out. This is normal as your body adjusts to the extra fibre and usually subsides quickly. -
Not suitable for everyone.
People with swallowing difficulties, gastrointestinal blockages, or digestive disorders should only take glucomannan after consulting a doctor.
Pregnant or breastfeeding women should also seek medical advice beforehand.
Conclusion: When used correctly, glucomannan is safe and can effectively support your weight-loss journey. The key is simple: combine it with plenty of water and stick to the recommended dosage to avoid any side effects and get the full benefit.
1 Glucomannan contributes to weight loss as part of a calorie-controlled diet. The beneficial effect is achieved with a daily intake of 3 g glucomannan (3 × 1 g portions).
2 Glucomannan contributes to the maintenance of normal blood cholesterol levels; this effect occurs with a daily intake of 4 g glucomannan.
3 https://www.mri.bund.de/fileadmin/MRI/Institute/EV/NVSII_Abschlussbericht_Teil_2.pdf .
4 https://www.dge.de/wissenschaft/referenzwerte/ballaststoffe/.
5 Shah et al., 2015
6 Yang et al., 2012
7 Zhang et al., 2023
8 Jian et al., 2024

