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Weigh-ins and Weight Trend
Updated February 6, 2026
This content is for informational purposes only and is not a substitute for professional advice.
Weigh-ins create the trend signal that keeps targets honest when single scale readings jump around.
Why weigh-ins matter in Fuel
Apple Watch energy describes what you spent. Food logs describe what you ate. Weight trend describes what those inputs produced.
If you want targets to adapt instead of staying theoretical, weight needs to be part of the loop. Without weigh-ins, it is harder to tell whether a miss came from the plan, from missing logs, or from a week that was not representative.
How to log weigh-ins
- Record weight in Apple Health, either from a connected scale or as a manual entry.
- Confirm Fuel can read weight in Apple Health permissions.
- Weigh under consistent conditions so trend reflects behavior changes, not measurement drift.
Consistency matters more than the exact device. A stable stream of similar measurements produces a better trend than occasional perfect measurements.
Frequency and consistency
Daily weigh-ins make trend settle faster, but a smaller cadence can still work if it is consistent.
If your schedule supports it, weigh at the same time of day. If your schedule does not support that, accept the noise and focus on the multi day direction rather than any single number.
Interpreting short term noise
Weight moves for reasons that are not fat gain or loss. Common causes include water shifts, glycogen changes, and digestion timing.
The point of trend is to filter those effects so your plan responds to the signal that persists across a week, not the volatility of an isolated day.
When signals disagree
Sometimes weight is up even when training feels better and hunger is stable. That pattern is common on weeks with higher carbohydrate intake, higher training volume, travel, or disrupted sleep.
Use trend, not a single weigh-in, as the decision input. If the 7 to 14 day trend is still moving in the intended direction, do not rewrite the plan based on a one day spike. If the trend is drifting for a full week and the logs are complete, then targets may need to move.
If weight trend is missing or looks wrong
- Open Apple Health and confirm recent weight entries exist.
- Confirm Fuel has permission to read weight.
- Check whether multiple sources are writing weight and whether the intended source is prioritized.
If Apple Health is correct but Fuel still looks wrong, use Troubleshooting to walk through the common causes.