Effect snapshot
Intervention Increase daily fiber from ~15g to 30g via whole foods
Outcome Self-reported bowel regularity scores
Effect 15–35 percent relative increase
Confidence study
Context Adults with mild irregularity, 4–8 week dietary interventions

Sources

What changes

Doubling fiber toward 30g/day is commonly associated with a 15–35% relative improvement in regularity scores in short dietary studies.

When this tends to work

  • Conditions similar to: Adults with mild irregularity, 4–8 week dietary interventions
  • You can measure Self-reported bowel regularity scores reliably
  • The intervention is implemented consistently, not half-measured

When to be careful

  • Your audience or product differs materially from the cited context
  • Compliance costs or second-order effects outweigh the lift
  • Evidence label is study—treat wide ranges as planning bands, not promises

Practical takeaway

Use the cited range for prioritization and test design. Verify against your own data before scaling.