The watch companion exists for speed. It helps you capture nutrition inputs and workout context in the moment so your targets and coaching are built from real data.
01Log food water weight and workouts from the wrist
On Apple Watch, Fuel focuses on actions that benefit from being immediate.
Wrist quick log is the core workflow. It is designed for repeated meals, post training routines, and the kind of small actions that get skipped when the phone is not nearby.
The watch also supports weight logging, hydration, fasting, workouts, sauna and ice bath sessions, Health Grade, recent activity, and sync status. Use it when the phone would slow down the capture.
02A home screen that follows the day
The Watch home screen changes its lead card with the available context. It can show fasting progress, a recent post-log note, yesterday's review, or a morning, midday, or evening summary. Scroll for nutrition totals, water, Health Grade, logging actions, and Recent activity.
The freshness line tells you whether the watch is syncing, needs attention, or is showing an older update. If it says Open Fuel on iPhone to update, open the phone app to refresh the shared record.
03Find the Watch instructions for each task
Use the topic guides for the steps and screenshots that match what you want to do. The Watch shares your record with iPhone, so corrections and detailed setup remain available there.
| Task | Help guide |
|---|---|
| Log a favorite or recent food | Food Logging |
| Dictate a new meal | AI Food Logging |
| Add water | Hydration |
| Log a weigh-in | Weigh-ins and Weight Trend |
| Read calories and macros | Energy Balance and Adjusting Macronutrients |
| Check daily nutrient highlights | Micronutrient Targets |
| Check fasting | Fasting |
| Log a workout preset | Workout Logging |
| Time a sauna or ice bath | Sauna sessions and Ice bath sessions |
| Read your grade or streak | Health Grade and Streaks |
| Read your reviews | Daily Review and Weekly Review |
| Check medication-cycle context | GLP-1 Support |
| Inspect today's entries | Timeline |
| Refresh old Watch data | Troubleshooting |
04Installing the watch app
Fuel installs on Apple Watch through the iPhone Watch app.
- Install Fuel on iPhone and open it once
- Open the Watch app on iPhone
- Scroll to Available Apps, find Fuel, then tap Install
If Fuel is already listed under Installed on Apple Watch but you cannot find it on the watch, restart both iPhone and Apple Watch, then check again.
05Watch face complications
Fuel supports watch face complications so the day stays visible without opening the app.
- Press and hold your watch face
- Tap Edit
- Swipe to the complications screen
- Tap a complication slot and select Fuel
The configurable metric complication offers nine choices: Calories, Protein, Macros, Water, Fasting, Sauna, Weight, Health Grade, and Streak. Add it to compatible circular, rectangular, inline, or corner slots, then choose the metric you want to see. See Watch Complications for setup and metric details.
Complications update based on the most recent watch and iPhone sync. Open Fuel if you need to check the latest record.
Use Streaks to understand what counts toward the streak counter.
06Wrist quick log workflow
Quick log is not a separate diary. It is a faster capture path that syncs back into the same Apple Health nutrition record stream.
Tap the fork-and-knife button at the top of Watch Today to open Quick Log, then choose a favorite or recent food when its saved portion matches your meal. If the list is empty, add favorites on iPhone and use Sync now on the watch.
For a new meal, tap Describe a meal and dictate what you ate, including useful quantities. The watch sends that request to iPhone for analysis. A pending entry can show Analyzing on iPhone before nutrition values are ready, so the text appearing in Recent activity does not mean analysis has finished.
If a pending entry shows Needs attention, open it. Retryable failures offer Sync now, and failed pending commands can offer Undo. To undo a completed Watch food log, open its entry in the iPhone Today timeline, tap the delete button, and confirm. The Watch reflects the corrected record after sync.
07Fix a wrong watch log before it sticks
Treat watch logging as the first pass. The goal is a stable daily record, not perfect restaurant grade measurement in the middle of a busy day.
Open the food entry on iPhone to inspect it or undo the log. Delete an unwanted entry from the Today timeline, then log a replacement if needed. Making the correction the same day keeps Daily Review and weekly coaching aligned with what you actually ate.
08Weight logging from the watch
Open Weight from Watch home for your latest synced weight, its recency, and an available trend rate. A compact chart appears when the watch has at least two history points.
Tap +, adjust the value with the buttons or Digital Crown, then tap Log Weight for a new weigh-in. The entry starts from your last known weight in your preferred unit and syncs back to the same record used on iPhone.
The Watch chart is a recent synced view. Use iPhone for wider date ranges, past-entry corrections, or a refresh when the watch asks you to open Fuel. See Weigh-ins and Weight Trend for the full weight workflow.
09Read daily and weekly reviews
Watch Daily Review shows a compact recap of yesterday with available Health Grade, nutrition, coach summary, and energy details. Weekly Review shows the reviewed dates and available weekly guidance. Tap a day in its grade strip for the day details, or Nutrition totals for the weekly summary when available. Open iPhone for the full review and past weeks.
The phone prepares both reviews. No review yet means the watch does not have a usable current review. Open Fuel on iPhone to update it. A missing Watch review is not proof that the reviewed period had no logs.
Review access follows the usual Free and Pro rules. Use Daily Review and Weekly Review for the review windows and what the summaries mean.
10When to switch back to iPhone
Use iPhone for photo based logging, recipe details, and any edit where you want full context. The watch is a capture surface, not the place for long form planning.
11Water logging from the watch
Tap the droplet button on Watch Today to open Add Water, or open the Water card and tap +. Choose the amount you drank and check your progress toward the daily target. The entry syncs back to the same Hydration record on iPhone.
12Fasting timer on the watch
The fasting view mirrors the fasting tile on Today. It shows your current fasting state, elapsed time, and available stage timing. The + button opens Quick Log for food. If you use fasting notifications, they also appear on the watch. See Fasting for how fasting stages work.
13Workout logging from the watch
Fuel's Workout control opens a preset logging list. Tap a preset to log the activity with its displayed duration and preset effort. Use iPhone for a different duration or effort, and Apple's Workout app for live exercise tracking. See Workout Logging for the Watch steps.
Workouts already recorded by Apple Watch reach Fuel through Apple Health. Let those records import rather than logging the same session again.
If App Preferences maps Apple Health Other workouts to Sauna, Fuel presents those matching entries as sauna context across Today, Watch, and coaching.
14Sauna sessions from the watch
Sauna has its own watch flow. Start a session, set the temperature when needed, and watch elapsed time, estimated calories, and heart rate during the session.
When you end the session, Fuel syncs the sauna entry back to iPhone and writes compatible workout data to Apple Health when permissions allow. Pause and resume from the session controls, or return Home and reopen the Sauna tile. See Sauna sessions for the full sequence and the iPhone recap.
15Ice bath sessions from the watch
Open the Ice bath tile on Watch Today, enter the temperature, and tap the blue play button. Pause, resume, or use the red square to finish and save. Returning Home leaves the session open so you can tap its tile to return.
Use Ice bath sessions for the illustrated steps, save status, and reviewing the completed entry on iPhone.
16Daily nutrition progress on the watch
Tap a macro card on Watch Today to open Today Progress. Scroll through calories and macros, then the available daily micronutrient highlights. Energy Balance explains the calorie labels, and Micronutrient Targets explains the highlights.
Today Progress shows daily intake. Use iPhone for your longer-term Plan Progress and Nutrient Insights.
17Health Grade and activity sync on watch
The Health Grade screen shows the current grade and contributor context from the watch. Tap Recent on Watch Today to see the day's entries, then tap a row for details. See Timeline for the Watch list and iPhone corrections.
Pull down on Watch Today to refresh. The Sync screen and Sync now recovery buttons request fresh iPhone data when it is needed. Use Troubleshooting when the Watch looks stale.
18Watch widgets
Fuel's configurable metric widget provides Smart Stack cards for your chosen metric, including water, fasting, and weight. Next Action and Coach are separate Smart Stack widgets for guidance from Fuel.
Hydration, Quick Log, Workout, and Weight controls open their corresponding logging flows. Choose a metric card for a quick glance or a control to start logging.
