Why days need labels
To the algorithm, an empty day is ambiguous: did you fast, forget to log, or track somewhere else? Each answer should be treated differently — so the day options screen lets you say which it was.
Intentional fasting
Marking a day as fasting declares "zero calories, on purpose." The day counts as fully logged at zero — it feeds your averages and expenditure like any logged day, instead of looking like missing data. Fasting deliberately never pauses your estimate.
Incomplete logging
The mirror case: you ate normally but only part of it made it into the diary. Marking the day incomplete excludes it from the calculations — a half-logged day would otherwise read as a genuinely low-calorie day and quietly inflate your expenditure estimate. Your entries stay visible; the day just stops testifying.
Use it honestly: many excluded days leave the algorithm with too little to work with (see Why Your Expenditure Is Paused).
Manual day totals
For a day tracked elsewhere — a different app, a paper estimate, a nutritionist's plan — you can type the day's total calories and macros directly. The manual total takes over as the day's number without deleting any entries underneath, and clears just as easily if you change your mind.
Where to set them
The Day options screen is reachable from wherever you notice the day: the journal's edit-day action, the Edit Day shortcut on the add button, or by tapping any day on the food-logging calendar. The weekly check-in also offers the fasting and incomplete markers right where you review the week.
A few sensible guardrails: fasting and incomplete are mutually exclusive (a day can't be both a deliberate zero and an excluded unknown), none of it applies to future dates, and Clear manual entry asks before removing a manual total — clearing recalculates the day from your logged meals, deleting nothing.