# How to log when you actually ate versus your planned eating window

> Keep a plan-versus-actual meal log for intermittent fasting: what to write, when to write it, and how to use it to adjust next week's windows. Paper and app options.

Published 2026-11-02 by ODEL.

To compare your planned eating window with what really happened, keep two times side by side every day: the window you planned, and the times you actually started and finished eating, with a one-line note about anything that changed. Write the actual times right after each meal, not at night from memory. Once a week, look at the differences and adjust the next week's plan.

> Not medical advice. This is about keeping a record. Decide on fasting routines with your doctor if you have a health condition, take medication, are pregnant or have a history of disordered eating.

## Why a timer alone is not enough

Many fasting apps track the fast with a timer. A timer that starts from a schedule can drift from reality: a 2020 review on [MyFast's App Store page](https://apps.apple.com/us/app/myfast-fasting-timer-app/id1218416683), for example, describes a schedule mode that runs like a clock rather than when you actually start and stop. A manual timer you forget to stop has the same problem. A short meal log fixes both: it records when you ate, not what the clock assumed.

## What to write for each day

| Planned window | First meal | Last meal | Note |
|---|---|---|---|
| 12:00 to 20:00 | 12:15 | 19:40 | |
| 12:00 to 20:00 | 10:30 | 20:30 | Breakfast meeting, late dinner |

Optional columns, if they matter to you: what you ate in a few words, protein, water, hunger or energy before the first meal.

Keep it short. A log that takes five seconds per meal survives; one that needs a full food diary often does not.

## When to write it

- **Right after the meal.** Times are accurate and the note is honest.
- **Use the clock on your phone,** not a guess. "About noon" adds up to an hour of error over a week.
- **Write skipped meals too.** "Skipped lunch, first meal 17:00" is useful information.

## Option 1: A paper log

One page per week with the table above. Planned windows filled in on Sunday, actual times filled in during the week. Cheap and visible on the fridge or in a notebook you keep in your bag.

## Option 2: Notes or a spreadsheet on your phone

A note titled "Meals this week" with one line per meal ("Mon 12:15 lunch") works. A spreadsheet with the table above lets you calculate the actual eating window each day and compare it with the plan.

## Option 3: An app with a meal journal

Some fasting apps focus on the timer and limit meal logging. [Zero's App Store listing](https://apps.apple.com/us/app/zero-fasting-food-tracker/id1168348542), for example, says free users get three meal logs. If plan-versus-actual is what you care about, look for an app that keeps a meal journal next to the planned window.

[Fasting Week](/app/fastly) does this on iPhone:

1. **Plan the week first.** Choose your routine and planned meal times, then review and save seven days of eating windows; each day can differ.
2. **Record each actual meal** with its time and an optional note. It appears next to that day's planned window, so differences are visible straight away.
3. **Start the fasting timer yourself** after your last meal. It is separate from the plan, so a changed day does not leave the timer wrong.
4. **Log protein, water and weight** if they are part of your routine.
5. **Export the journal** from the share sheet if you want to keep a copy or show it to someone. Nothing is uploaded automatically.

Fasting Week needs no account, shows no ads and stores records on your device. It has no Apple Health sync in the current version, is iPhone only, and is free to download with optional Premium.

## The weekly review

Once a week, spend five minutes with the log:

1. **Which days matched the plan?** Keep those windows.
2. **Which days drifted, and why?** Look at the notes. Work meetings, social meals and late shifts are the usual causes.
3. **Is the drift a pattern?** If Friday dinners always run late, move Friday's planned window later instead of "trying harder".
4. **Set next week's plan** from what you learned.

The goal is a plan that fits your real week. If a logging habit starts to feel stressful or obsessive, stop and talk to a doctor; a log should help, not add pressure.

For more on building the weekly plan, see [how to set a different eating window for each day](/blog/set-a-different-eating-window-for-each-day-of-the-week), and for app options, [Zero fasting app alternatives](/best/zero-fasting-alternatives).