Drinking enough fluids can help fiber work better and make stools softer and easier to pass. But that does not mean drinking water beyond what your body needs will reliably relieve constipation. Increase fiber gradually, stay adequately hydrated, and follow the liquid directions if you use a fiber supplement such as psyllium.
How fluids help fiber
Fiber helps add bulk to stool, while adequate fluids help keep stool softer and easier to pass. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) advises drinking water and other liquids to help fiber work better: NIDDK guidance on eating, diet, and nutrition for constipation. It also recommends plenty of water and other liquids when you eat more fiber or take a fiber supplement: NIDDK treatment guidance.
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This is a recommendation to get enough fluid alongside fiber—not evidence that extra water beyond adequate hydration will improve constipation for everyone. Fluid needs vary with factors such as body size, health, activity, and location, so ask a health professional for advice about your individual needs.
How much water should you drink with fiber?
There is no single extra-water target established for everyone with constipation. Keep up your usual adequate fluid intake as you increase fiber; water is one option, and NIDDK also lists other liquids such as clear soups and naturally sweetened fruit or vegetable juices. If a health condition affects how much you should drink, ask your health professional rather than increasing fluids on your own.
#1 Best Overall
- WHAT'S INCLUDED: One 17.6-ounce bottle of unflavored Benefiber Daily Prebiotic Fiber Supplement Powder for Digestive Health (1)
- BENEFIBER HELPS YOU FEEL FULLER LONGER: GLP-1 support for fiber gap*
- SUPPORTS DIGESTIVE HEALTH: Daily fiber powder supplement that nourishes the growth of good bacteria that exist in your gut to help you maintain good digestive health
- DISSOLVES CLEAR AND COMPLETELY: Benefiber Prebiotic Fiber Supplement Powder is taste free, grit free, and dissolves clear and completely when you mix into non carbonated beverages and food (2)
- PLANT-BASED PREBIOTIC FIBER: Made with wheat dextrin, a plant-based fiber that nourishes your gut’s good bacteria and helps them grow (1)
Increase fiber gradually
NIDDK gives a general adult fiber target of 22 to 34 grams per day, depending on age and sex. This is a dietary recommendation, not a measured water-treatment effect, and an individual plan may differ. Add fiber gradually and choose fiber-rich foods that suit you; increasing it too quickly may be uncomfortable. See NIDDK’s constipation diet guidance for more information.
Do you need extra water with psyllium?
Psyllium absorbs liquid and swells, forming a bulkier stool that is easier to pass. For powder and granules, MedlinePlus says to mix a dose with 8 ounces (240 milliliters) of liquid and take at least 8 ounces with it. Follow the directions for your actual product: MedlinePlus: Psyllium drug information.
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- 4 HEALTH BENEFITS, 1 DAILY FIBER. Metamucil is the only leading fiber brand made with psyllium husk fiber
- for 4-in-1 health benefits!
- PSYLLIUM HUSK FIBER helps support: digestive health*, heart health by lowering cholesterol, healthy blood sugar levels*, and appetite control*
- SUGAR-FREE AND DELICIOUS smooth textured fiber powder with a refreshing orange flavor.
- FEEL WHAT LIGHTER FEELS LIKE. Metamucil psyllium husk fiber helps promote regularity* so you can feel lighter and more energetic**
When to seek advice
Changes to fiber and fluids may take days to make a difference, and sometimes weeks, according to NHS constipation guidance. If dietary and lifestyle changes are not helping, speak with a pharmacist for advice. Seek guidance from a health professional if symptoms persist or if your health circumstances affect your fluid needs.
Quick Recap
Best Value
- 4 HEALTH BENEFITS, 1 DAILY FIBER. Metamucil is the only leading fiber brand made with psyllium husk fiber
- for 4-in-1 health benefits!
- PSYLLIUM HUSK FIBER helps support: digestive health*, heart health by lowering cholesterol, healthy blood sugar levels*, and appetite control*.
- SUGAR-FREE fiber powder with refreshing orange flavor (not a low calorie food).
- FEEL WHAT LIGHTER FEELS LIKE. Metamucil psyllium husk fiber helps promote regularity* so you can feel lighter and more energetic**.
Rank #4
- EXCELLENT SOURCE OF FIBER: Soluble fiber from foods such as psyllium seed husks, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease
- DIRECTIONS: Vigorously mix 1 level tablespoon daily into at least 12 oz. of water or juice and consume immediately
- 6 GRAMS OF SOLUBLE FIBER: A serving of psyllium husk powder supplies 6 grams of the 7 grams soluble fiber necessary per day
- GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation)
- Packaged in the USA by a family owned and operated company since 1968
Rank #3
- PURE POWDER: Fibersol-2 is a tasteless, soluble fiber derived from non-GMO corn that can help manage hunger and promote a feeling of fullness up to two hours after a typical meal in healthy adults while also helping maintain healthy, normal glucose levels*
- EXCELLENT SOURCE OF FIBER: Fibersol-2 also acts as a prebiotic fiber that can help to nourish intestinal flora and maintain a healthy intestinal tract environment*
- MAINTAINS REGULARITY*: Dissolves rapidly in water or your favorite beverage and is a convenient and effective way to help maintain regularity*
- GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation)
- Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products
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