About Fiber
Evidence is strong for dietary fiber overall, but it varies sharply by type: soluble fibers such as psyllium, beta-glucan, and pectin have stronger evidence for lowering cholesterol and improving glycemic control than insoluble fiber. Most adults fall well short of the 25–38 g/day intake target, so total daily fiber matters more than the specific source for general health. This generic entry covers products that list total fiber without naming a type; specific fibers like psyllium, inulin, and pectin have their own entries with more precise dosing.
What Fiber supports
- Supports digestive regularity and gut health
- May reduce cardiovascular risk at ≥10 g/day (umbrella review of meta-analyses)
- Modest weight management support via increased satiety
How much Fiber to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
RDA
28
g
Effective
10–30
g
AI is 25–38 g/day (women/men). Most RCTs showing consistent benefits for cholesterol, blood glucose, and weight use 10–15 g/day supplemental fiber. FDA heart-health claim requires ≥7 g/day soluble fiber from psyllium.
Clinical evidence
Moderate clinical evidence. Strong overall evidence from umbrella reviews, but results vary significantly by fiber type
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