Adaptive Fuel

How FitLog reads it

• FitLog looks at several days together, not one meal or one workout.
• It uses moving averages: calories eaten, body-weight trend, and logging consistency.
• Zero-kcal days are shown in the chart as excluded data, but they do not pull down the average used by the engine.
• The engine calculates a cautious maintenance range and an estimated center.
• The center is estimated maintenance, not a target that must always be applied: Adaptive Fuel then calculates a separate destination for the selected goal.
• AI does not invent calories: in the Weekly Report and details it only explains numbers already calculated by the engine.

How each goal changes

• Maintenance uses the estimated center as its destination.
• Cut uses a 10%, 15%, or 20% deficit for a gradual, balanced, or fast pace, capped at 500 kcal per day.
• Recomposition generally uses a light 2.5%, 5%, or 7.5% deficit according to pace; it stays at maintenance when weight is stable and body-fat percentage is already improving.
• Mass uses a cautious 5-10% surplus according to pace and training consistency.
• The destination is not applied all at once: FitLog proposes the next step, capped at 100-250 kcal according to goal and confidence.

Operational steps

1. 1

   Tap the pencil in `Estimated needs` and choose maintenance, cut, recomposition, or mass.

2. 2

   Select the desired pace, current target sustainability, hunger, recovery, and performance trend.

3. 3

   FitLog saves the answers with the goal and immediately starts a new server-side calculation using the calories, weigh-ins, and workouts you already logged.

4. 4

   Review the proposal and use `Apply target` to actually update daily calories: the maintenance center never replaces your target automatically.

Data needed

• The first read can start from 14 useful days.
• Reliable recommendations need at least 21 days, about 70% of days with calories logged, and recurring weigh-ins.
• Workout frequency directly affects the mass and recomposition strategy; duration, volume, sleep, active calories, and recovery remain context signals.
• Wearable active calories are not blindly added to the target: the estimate stays anchored to logged intake and the real body-weight trend.
• If no goal is configured, FitLog uses maintenance and notes it in the report.
• If the app goal is cut, mass, maintenance, or recomposition, Adaptive Fuel shows it as the goal used in the proposal details.
• You can change the goal and answers from the Today nutrition card: the new calculation starts immediately without rewriting completed reports.

Where you see it

1. 1

   Open Home and check the `Today nutrition` card.

2. 2

   Free users see data readiness and the Premium CTA.

3. 3

   After a short introduction, the Free teaser shrinks into a compact fuel gauge: the needle settles at three quarters and remains tappable for Premium.

4. 4

   Premium users without dedicated consent are asked to authorize nutrition, body, training, and recovery data.

5. 5

   When data is ready, you see range, center, confidence, and next review.

Apply the target

• FitLog suggests small weekly changes and applies them only after explicit confirmation.
• Before applying, the carousel starts with a visual dashboard showing the range, maintenance center, goal destination, daily calorie chart, body trend, data quality, and next proposed target.
• The calorie chart can be expanded to read every day in the calculated window.
• If you know you under-logged or over-logged calories, you can declare a correction: it does not edit the diary and only affects that proposal.
• The correction slider updates the chart and proposal immediately, so you can see the effect before confirming.
• Applying starts from today and updates the existing nutrition target.
• Protein and fat are protected with floors tied to body weight and goal; most of the calorie change is assigned to carbohydrates.

What to expect

• You reach a verifiable result at the end of the flow.
• Saved data remains consistent with the guide objective.
• You can continue to related guides without extra setup.