A fitness app with no calorie counting.

Why does calorie counting backfire for some people?

In October 2025, researchers at UCL, Loughborough University and the University of Westminster published a study in the British Journal of Health Psychology that took a different approach to this question. Instead of surveying volunteers, they collected 58,881 public posts about the five highest-revenue fitness apps, including MyFitnessPal, Strava and WW, then used machine learning to isolate the 13,799 that carried negative sentiment and group them into themes.

What surfaced was not a complaint about features. It was a pattern of emotion. Users described shame at having to log "unhealthy" foods, irritation at notifications telling them to log calories, and disappointment at slow progress toward targets an algorithm had chosen. Some described giving up on the goal entirely, which is the precise opposite of what the app was for.

Two details stood out to us. The first is that the apps' goals were driven by the user's weight target rather than public health guidance, which in some cases produced recommendations that were plainly unsafe. One user reported being told to eat negative 700 calories a day. The second is what happened around streaks and daily goals. When people missed a target, the researchers observed avoidant behaviour or complete disengagement, not a redoubled effort.

The researchers also pointed to earlier work finding that measuring an activity can reduce your enjoyment of it. Their example is hard to forget: a runner who hit a personal best in a half marathon and then posted about the disappointment of it not being recorded properly by the app.

Their recommendation was direct. Senior author Dr Paulina Bondaronek wrote that instead of "very narrow, rigid measures of success relating to amount of weight lost, health apps should prioritise overall wellbeing and focus on intrinsic motivation, i.e., the inherent enjoyment or satisfaction in activities."

One caveat matters, and the researchers raised it themselves: the study only examined negative posts, so it cannot say anything about the overall effect of these apps. As Dr Bondaronek put it, they "may have a negative side, but they likely also provide benefits to many people." Millions of people use MyFitnessPal productively. If calorie tracking works for you, it works, and nothing here is an argument for abandoning it.

What Fitji does instead

Fitji was in design before we read that paper, but the paper described the failure mode we were building against. Four choices follow from it.

There is nothing to log

Fitji reads steps, distance, heart rate, sleep sessions and workout sessions from Apple HealthKit on iPhone or Health Connect on Android. That is the whole input. There is no screen for entering food, because a log you can fall behind on is a debt, and debts create the shame the study documented.

Your companion's state is a word, not a percentage

Fitji shows mood as one of five qualitative states: Energized, Content, Sluggish, Sleepy or Lonely. Tapping it explains why it is there and what would lift it. It is deliberately not a number, because a number invites optimisation, and optimisation is where the misery starts.

Neglect pauses progress, it never destroys it

Your companion cannot die, get sick, or be taken from you. A rough week stalls progress and nothing more. A virtual pet whose survival depends on your step count is a guilt machine wearing a friendly face, and the study is a decent preview of where that leads.

The goal is a threshold, not a deficit

Your egg hatches at 10,000 steps or 30 minutes of elevated heart rate, whichever comes first, and it waits until you tap it. It is a door that opens, not a quota you are behind on. Nothing in Fitji is calculated from your body weight, because we never ask for it.

Where Fitji still uses numbers

It would be easy to overclaim here, so plainly: Fitji is not free of quantification. It reads your heart rate. It counts your steps. It has exactly one visible number, experience points, and it has streaks. The distinction we are drawing is about what happens to those numbers, not whether they exist.

• Streaks unlock cosmetics only. Hitting 5, 10 or 30 consecutive active days earns your companion something to wear. Breaking a streak removes nothing you already have and does not set your companion back.
• Consistency is a tier, not a tally. Fitji reads how many of your last seven days were active and shows a resilience tier from Fragile up to Ironclad. It is a rolling window, so it recovers on its own once you are moving again. There is no number to get back to zero.
• Daily experience is capped. You cannot grind your companion faster by walking until you hurt. Past a point each day, more steps stop paying, which is a limit we would rather build in than leave to willpower.
• Sleep is a bonus, never a penalty. Six hours or more grants a boost to the next day's experience. Sleeping badly costs you the bonus, not progress you already earned.

What we are not claiming

Fitji is a game, not a health intervention, and we have not studied whether it helps anyone move more. Nobody has. It is in closed beta with a small group of players, and the honest status of every claim on this page is "this is the design stance we took and the reasoning behind it," not "this is proven to work better." We would rather tell you that than dress up a design decision as evidence.

We also want to be careful about the territory this subject borders. If tracking food or exercise has become distressing or difficult to stop, that deserves better support than an app of any kind, ours included, and talking to a doctor or a qualified professional is a genuinely good move. Choosing a game with no food log is not a treatment plan.

Common questions

Is there a fitness app that does not count calories?

Yes. Fitji is a fitness app for iOS and Android with no calorie counting, no food logging and no macro tracking anywhere in the product. It reads your movement from Apple HealthKit or Health Connect and turns it into a virtual companion that grows as you move. There is nowhere to enter what you ate, because Fitji never asks.

Does Fitji track weight or calories burned?

No. Fitji does not ask for your weight, does not set a weight goal, and does not show calories burned. It reads steps, distance, heart rate, sleep and workout sessions, and uses them to advance your companion rather than to score your body.

Does Fitji have streaks?

Yes, but they only unlock cosmetic items at 5, 10 and 30 consecutive active days. Breaking a streak does not remove anything you have already earned and cannot harm your companion. Fitji also tracks a resilience tier from how many of your last seven days were active, which recovers on its own as you move again.

Can your pet die in Fitji?

No. Your companion cannot die, get sick, or be taken away. Missing days pauses progress but never destroys it. This is a deliberate design decision: a pet held hostage to your step count is a guilt machine, not a companion.

Is Fitji a weight loss app?

No. Fitji is a game about moving a bit more often, and it makes no weight loss claims. If your goal is a specific weight outcome or you need clinical nutrition guidance, Fitji is not the right tool and a qualified professional is a better starting point.

References

• Sheen, F., Porter, L., Papakonstantinou, T., Ceka, M., & Bondaronek, P. (2025). Living well? The unintended consequences of highly popular commercial fitness apps through social listening using Machine-Assisted Topic Analysis: Evidence from X. British Journal of Health Psychology. doi:10.1111/bjhp.70026
• UCL News (22 October 2025). Emotional strain of fitness and calorie counting apps revealed.

Fitji's own mechanics described on this page reflect the closed beta build as of July 2026. Game balance is still being tuned with players, so specific thresholds may change. The design principles will not.

Back to Fitji to see how the daily loop works, or to join the closed beta.