Does Fibre Help You Lose Weight? Why It Might Be Your Missing Piece

Short answer: yes, eating more fibre is linked to losing more weight — but where the fibre comes from matters. Fibre from food and high-fibre meals has the strongest evidence. Fibre powders on their own have a more mixed record.

Here's what the research actually shows, and how to use it.

What the research says

In a large US diet trial, adults on a reduced-kilojoule diet were followed for six months. The change in how much fibre people ate was the strongest single predictor of how much weight they lost — regardless of which diet they were on.

Higher fibre also made it easier for people to stick to their diet. That's the real story: fibre doesn't melt fat, it makes eating less feel less like deprivation.

The evidence for fibre supplements taken on their own is less convincing. Some trials show small benefits for fullness; others show no extra weight loss at all. So treat a fibre supplement as a way to close the gap, not as a weight-loss product.

Why fibre helps when you're eating less

It keeps you full. Soluble fibre absorbs water and slows how fast your stomach empties. A meal with fibre in it simply lasts longer.

It steadies your blood sugar. Fibre slows how quickly sugar from a meal reaches your bloodstream. Fewer spikes means fewer crashes — and fewer mid-afternoon cravings.

It gives you more food for fewer kilojoules. High-fibre foods like vegetables, legumes and berries are bulky but light. You can fill the plate without filling the day's budget.

It feeds your gut bacteria. Certain fibres are fermented in the large intestine. Researchers are still working out how much that matters for weight, but it's a good reason to eat a variety.

Why it matters more after 40

Appetite changes, insulin sensitivity tends to decline in midlife, and digestion often slows. Fibre helps on all three fronts. Yet most Australian women fall short of the 25 g a day they need. Why fibre matters more after 40 →

The combination that works: fibre plus protein

Fibre keeps you full. Protein keeps you full and protects muscle while you lose weight. A meal that has both is the hardest one to overeat after.

That's why breakfast matters so much. Toast and jam has almost neither. Eggs on wholegrain toast with spinach has both. So does a high-protein, high-fibre shake.

How to reach 25 g a day without adding kilojoules

• Start the day with 7–10 g. Oats with chia, or a high-fibre shake, gets you a third of the way before 9am.
• Half the plate as vegetables at lunch and dinner.
• Swap one carb a day for legumes — lentils, chickpeas or beans.
• Snack on fruit with the skin on, or a small handful of nuts.

Our 7-day meal plan lands between 30 and 41 g of fibre a day, if you'd rather not do the maths.

Go slowly

Jumping from 12 g to 30 g overnight is the quickest way to feel gassy and uncomfortable. Add 3–5 g a week, and drink more water as you go. If fibre has disagreed with you before, the type is usually the cause — fast-fermenting fibres like inulin are the usual culprits.

Where MyPause fits

If you're trying to lose weight, start with the Slim Down Shake. Each serve has 7 g fibre and 30 g protein in 873–894 kJ — the fibre-plus-protein combination in one glass.

A formulated meal replacement that contributes to weight loss or weight maintenance as part of a diet reduced in energy and including regular exercise.

Shop the Slim Down Shake →

If you're still short on fibre, add Gentle Fibre Support. One 5 g sachet gives you 3.6 g of fibre from resistant starch, partially hydrolysed guar gum (PHGG) and acacia gum — slower-fermenting fibres that many people find easier to tolerate. It's unflavoured, so it disappears into water, a shake or a smoothie. It's designed to support your everyday fibre intake, not to cause weight loss on its own.

Not suitable for infants, children or women who are pregnant or breastfeeding.

Shop Gentle Fibre Support →