Dietary fibre is the part of plant food your body cannot digest, and it comes in two forms: soluble fibre, which dissolves in water to form a gel, and insoluble fibre, which does not. Soluble fibre lowers cholesterol and steadies blood sugar; insoluble fibre keeps digestion moving. Adult women need about 25 g daily (21 g after 50), yet most Indians eat well under 20 g.
What Is Soluble Fibre and What Does It Do?
Soluble fibre dissolves into a thick gel in the gut. That gel traps cholesterol-rich bile acids and slows how fast glucose enters the bloodstream.
The results are measurable: 5 to 10 g of soluble fibre daily can lower LDL cholesterol by roughly 5%, per research summarised by the Harvard T.H. Chan School of Public Health. This matters enormously for women after menopause, when falling oestrogen typically pushes LDL upward.
What Is Insoluble Fibre and What Does It Do?
Insoluble fibre passes through the gut largely intact, adding bulk to stool and speeding transit. It is the fibre that prevents and treats constipation, a complaint I hear from a majority of my midlife clients.
It also feeds a healthy colon over the long term; higher-fibre diets are consistently associated with lower colorectal cancer risk in large cohort studies.
Soluble vs Insoluble Fibre: Which Foods Contain Which?
| Soluble fibre | Insoluble fibre | |
|---|---|---|
| Main actions | Lowers LDL cholesterol, steadies blood sugar, increases fullness | Prevents constipation, supports colon health |
| Indian food sources | Oats, jau (barley), rajma, chana, moong dal, apples, guava, isabgol (psyllium), flaxseed | Whole wheat atta, millets like bajra and jowar, leafy greens, cauliflower, beans, fruit and vegetable peels |
| Best time to emphasise | With carb-heavy meals to blunt glucose spikes | Daily, with adequate water |
Most whole plant foods contain both types in different ratios, so variety solves the problem automatically.
How Much Fibre Do You Need Each Day?
- Women up to 50: 25 g per day
- Women over 50: 21 g per day
- Men up to 50: 38 g per day; over 50: 30 g
These are the Institute of Medicine recommendations. For perspective, a day with dalia for breakfast, dal-roti-sabzi for lunch, a guava as a snack, and khichdi with vegetables at dinner reaches about 30 g without any supplement.
How Do You Increase Fibre Without Bloating?
- Go slow: add about 5 g per week; jumping from 12 g to 30 g overnight guarantees gas and cramping.
- Drink more water: insoluble fibre without fluid can worsen constipation instead of fixing it.
- Spread it across meals rather than loading one giant salad at night.
- Use isabgol strategically: 1 teaspoon of psyllium provides about 5 g of mostly soluble fibre and is well studied for both cholesterol and regularity.
- Pair fibre with protein at each meal for fullness; this combination is the quiet engine of any sustainable caloric deficit.
Frequently Asked Questions
Which fibre is better for weight loss?
Soluble fibre has the edge because its gel slows stomach emptying and prolongs fullness, but the best results in studies come from total fibre intake above 25 g daily from mixed food sources rather than from either type alone.
Which fibre helps constipation?
Primarily insoluble fibre from whole grains, vegetables, and peels, together with water and movement. If constipation persists, isabgol works through a gentler soluble mechanism and is usually my first suggestion for midlife women.
Does cooking destroy fibre?
No, normal cooking preserves fibre content. Peeling is the real loss: an unpeeled apple has nearly double the insoluble fibre of a peeled one. Juicing removes almost all of it.
Can too much fibre be harmful?
Above roughly 50 to 60 g daily, especially from supplements, fibre can cause bloating and reduce absorption of iron, zinc, and calcium. Very few people ever reach that level from food.
About the Author
Nidhi Kakar is a nutritionist and the founder of Art of Wellness. She specialises in women’s health through the midlife years, from the mid-30s to the mid-60s, and has guided hundreds of women through perimenopause, menopause, and post-menopause with personalised nutrition and lifestyle plans.
This article is for educational purposes and does not replace personalised medical advice.
