Compensation changes the result
People may eat more before or after a fast, move less, or experience appetite and training changes. Early scale loss also includes water and glycogen.
Longer is not automatically better
Frequent or extended fasting can compromise nutrition, medication timing, training, and wellbeing. A steady moderate deficit can achieve fat loss without full fasting days.
Questions, answered plainly
Is the projection guaranteed?+
No. It is arithmetic based on entered maintenance calories and assumes no compensation or metabolic adaptation.
Why limit the calculator to two days?+
The tool is educational and deliberately avoids normalizing frequent prolonged restriction. Clinical needs require individual guidance.
Do I need an account to use the calculator?+
No. The web calculators are free and run in your browser without an account.
Sources and further reading
Sources behind the formulas and explanations.