A negative calorie adjustment is a downward correction to your daily calorie goal in MyFitnessPal. It appears when your connected fitness tracker reports that you’re burning fewer calories than MyFitnessPal originally estimated for your day. The feature is turned off by default, meaning most users never see these subtractions unless they deliberately enable them.
How the Adjustment Is Calculated
When you set up MyFitnessPal, you choose an activity level: sedentary, lightly active, active, or very active. The app uses that selection, along with your age, weight, height, and sex, to estimate how many calories you burn in a full day. This estimate is baked into the daily calorie goal you see each morning before you’ve done anything.
Once you connect a fitness tracker like a Fitbit, Garmin, or Apple Watch, the two systems start comparing notes throughout the day. Your tracker sends a total daily calorie burn figure (not just steps) to MyFitnessPal, along with a timestamp. MyFitnessPal then projects what the rest of your day will look like based on your current pace and compares that to its own original estimate.
If your tracker’s projected total is higher than what MyFitnessPal assumed, you get a positive calorie adjustment, meaning extra calories added to your daily budget. If the projected total is lower, the difference is negative. With the default settings, that negative difference is simply displayed as zero. But if you’ve enabled negative adjustments, the app subtracts those calories from your goal, giving you fewer calories to eat that day.
Why It Matters for Weight Loss
The core problem negative adjustments solve is overeating on lazy days. Say you told MyFitnessPal you’re “lightly active” because you walk around a fair amount at work. On a normal weekday, that estimate is reasonably accurate. But on a Saturday when you barely leave the couch, your body is burning significantly less than the app predicted. Without a negative adjustment, your calorie goal stays the same, and you’re eating more than you need without realizing it.
This is the same principle behind the difference between gross and net calories in exercise tracking. If you burn 400 calories on a run, some of those calories would have been burned anyway just sitting on the couch. The truly “extra” calories from that run are fewer than 400. Negative adjustments apply this logic to your entire day: if your actual movement falls short of expectations, the app corrects downward so your calorie target reflects reality.
How to Turn It On
Negative adjustments can only be enabled through the full MyFitnessPal website, not the mobile app. Log in at MyFitnessPal.com, click the “Settings” tab, then select “Diary Settings.” Check the box labeled “Enable Negative Adjustments” and save your changes. The setting will then apply across your account, including the mobile app.
There’s no indication that this feature is restricted to premium subscribers. It’s available to any user with a connected fitness tracker.
How Different Trackers Handle It
All major fitness trackers sync a total daily calorie burn number to MyFitnessPal. Steps are also sent, but MyFitnessPal only displays step counts. The actual math is done entirely with the calorie burn figure.
That said, not all trackers send data the same way. Fitbit syncs a straightforward total daily calorie burn. Garmin sends that plus detailed workout data including start time, duration, and calories. Apple Watch handles things differently: it sends a baseline figure that essentially reflects a sedentary minimum, then layers activity calories and workouts on top separately. This can occasionally cause quirks. Some Apple Watch users report that they only see meaningful calorie adjustments when they log a specific workout with the watch, not just from general daily movement.
The differences in how each device packages its data can lead to slight over- or under-counting, but for most people, the adjustments are close enough to be useful.
Should You Enable It?
Turning on negative adjustments gives you a more honest picture of your energy balance, especially if your activity varies a lot from day to day. If you selected “lightly active” or higher during setup, you’ll likely see negative adjustments on your less active days, pulling your calorie goal down. If you set your profile to “sedentary,” negative adjustments will be small or nonexistent because the baseline estimate is already low.
One common approach is to set your activity level to sedentary and let your tracker add calories back through positive adjustments on active days. This way, you start conservative and only earn extra food when you’ve actually moved. With this setup, negative adjustments rarely trigger because there’s not much room to go below a sedentary estimate.
The opposite approach, setting a higher activity level and enabling negative adjustments, works too. It just means your calorie goal will fluctuate more, going up on active days and down on rest days. Some people find this motivating. Others find it frustrating to watch their food budget shrink on a recovery day.
Why the Adjustment Sometimes Looks Wrong
A few things can make negative adjustments seem off. The most common issue is timing. Early in the day, MyFitnessPal has very little data from your tracker, so it projects the rest of your day based on a small sample. You might see a large negative adjustment at 9 a.m. that shrinks or disappears entirely by the afternoon as you accumulate more activity. Checking your adjustment early in the day is rarely useful.
Another source of confusion is the interaction between logged workouts and the daily calorie burn figure. When you log a workout manually in MyFitnessPal and your tracker also sends a total daily burn that already includes that workout, the app needs to avoid double-counting. It subtracts the logged workout calories from the tracker’s total before calculating the adjustment. With Apple Watch in particular, this subtraction can happen even when the tracker’s total didn’t actually include the workout, leading to a lower adjustment than expected.
If your negative adjustment seems unreasonably large, check whether you have duplicate workout entries or whether your tracker’s sync is delayed. A tracker that hasn’t synced in several hours will cause MyFitnessPal to project a very low daily burn, which can trigger a steep negative correction that fixes itself once the data catches up.