What changes

Pre-portioned meal prep is often associated with an 8–15% relative reduction in average daily calories in short interventions.

When this tends to work

• Conditions similar to: Office workers meal-prepping, 4-week interventions, 2020–2025
• You can measure Average daily calorie intake 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.