Refeed Day Calculator
Build a calendar from studied diet-break or refeed patterns while keeping calorie prescription and health clearance outside the tool. Sensitive inputs stay in your browser.
This is a date organizer for published research patterns or a clinician-defined pattern. It does not calculate calories, macros, eligibility, expected weight loss or medical clearance.
Context matters.
- MATADOR studied men with obesity using eight 2-week restriction blocks interspersed with seven 2-week energy-balance periods; it is not a universal protocol.
- NIDDK recommends reviewing medical conditions and medications with a health professional before a weight-loss program and says not to try to lose weight during pregnancy.
- Eating-disorder concerns or possible problematic low energy availability—such as persistent fatigue, recurrent injury/illness, reproductive changes or declining performance—need qualified assessment, not a more aggressive schedule.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Build a calendar from studied diet-break or refeed patterns while keeping calorie prescription and health clearance outside the tool. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses First day of the calendar, Date to locate in the plan, Calendar pattern, Custom restriction days per cycle and Custom maintenance / break days per cycle and 3 additional fields supplied in the form.
- Apply the scope. It applies the Research-protocol calendar for adults — health gates apply; no calorie, macro or treatment prescription reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
This is a date organizer for published research patterns or a clinician-defined pattern. It does not calculate calories, macros, eligibility, expected weight loss or medical clearance.
- Maintenance-intake basisUnknown — no maintenance target is established
- Calendar endsMar 27, 2027
- Current phaseRestriction reference block 1
Calculation purpose: Build a calendar from studied diet-break or refeed patterns while keeping calorie prescription and health clearance outside the tool. This is a conditional reference output; the linked source and the situation-specific facts control the decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 2.0.0 · Last reviewed 2026-08-23 · Next review due 2027-02-23. The source panel below contains the linked evidence.
What to know before using the result.
Does the calculator tell me how many calories to eat?
No. It schedules restriction and energy-balance phases from published study patterns or your clinician's plan. Maintenance intake and any deficit must be established individually.
Are diet breaks proven to produce more fat loss?
Not universally. MATADOR reported an advantage in men with obesity, while ICECAP found similar fat loss versus continuous restriction in resistance-trained adults. The studied populations and protocols are not interchangeable.
When should I avoid using a diet-break calendar?
Do not use it to plan weight loss during pregnancy, for a minor, or when eating-disorder concerns, medical conditions, medication interactions or signs of problematic low energy availability need professional assessment.