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Getting Started

Updated February 6, 2026

Fuel is an Apple Watch first nutrition app that uses Apple Health as the source of truth, so your first week is about making the data stream stable.

What Fuel needs to work

Fuel planning depends on three inputs you can verify.

Apple Watch provides activity and workout context through Apple Health. Food logging provides intake. Weigh ins provide trend so targets can be checked against outcomes.

If any of those inputs are missing, the app can still run, but coaching becomes less verifiable because there is less data to check.

Setup sequence

1. Install Fuel on iPhone and complete onboarding so permissions prompts can appear.
2. Grant Apple Health permissions for activity, workouts, and the nutrition categories you want Fuel to track.
3. Wear Apple Watch for normal daily activity so active energy is recorded.
4. Log your meals the same day so intake reflects reality, not memory.
5. Record a weigh-in and then repeat weigh-ins often enough to produce a usable trend. Use Weigh-ins and Weight Trend if you want a workflow that stays consistent.

Setup time

Most setups take about 4 to 7 minutes when you have your watch paired and Apple Health enabled.

1. Onboarding and permissions usually take 2 to 5 minutes
2. Your first meal log usually takes about 30 seconds, then repeats get faster
3. Your first weigh-in takes about 1 minute if Apple Health already has a weight source

First week calibration

Targets and reviews are only as stable as your week. Treat the first week as calibration, not as a performance test.

Calibration means you keep the data stream stable.

Wear Apple Watch on normal days, log meals the same day you eat them, and record weigh-ins often enough that trend can settle. Avoid changing targets based on one noisy day. Use a full week of data to judge whether the plan matches your reality.

What to expect from coaching

Daily review should read like an audit of what happened today. Weekly review should read like an explanation of what changed over the week and what should change next.

If a review feels generic, it usually means the inputs were generic. More complete food logs and consistent weigh ins make coaching more specific.

If something looks wrong

Start by checking the record, not the interpretation.

Use Apple Health Permissions to verify access and data sources, then confirm the watch is set up in Apple Watch Setup. If logging is the gap, start with Food Logging.