Dèficit calòric: què és i com es calcula

Com calcular un dèficit calòric sense portar-ho a restriccions massa dures.

Author
CalCalc
Reviewed by
CalCalc
Last updated
April 9, 2026

Short answer

A calorie deficit means eating less energy than your body uses over time. That part is simple. The hard part is that the deficit on paper is only a starting estimate. Weight loss slows, tracking error is common, and aggressive deficits often backfire through hunger, fatigue, and rebound eating. The most useful approach is usually a moderate deficit you can hold long enough to measure honestly.

En aquesta guia

El més important, en curt

Què és el dèficit calòric

Hi ha dèficit calòric quan durant un temps consumeixes menys energia de la que gastes en un dia normal. La pèrdua de pes es basa en això, però només funciona bé si també és sostenible a la pràctica.

Com es calcula

Primer s'estima el manteniment i després se'n resta un dèficit moderat. A la pràctica això funciona millor quan el càlcul va acompanyat del seguiment del pes, l'energia i la gana, no d'una fe cega en una sola xifra.

On se solen fer els errors

És habitual sobreestimar la despesa i quedar-se curt amb el que realment es menja. Un altre error típic és fer un dèficit massa gran i intentar aguantar-lo en una vida normal.

Com portar-ho al dia a dia

És més fàcil si et recolzes en una base de productes, racions raonables i uns quants àpats que es repeteixen. Així treballes amb decisions reals, no només amb teoria.

Calorie deficit FAQ

How large should a calorie deficit be?

A moderate deficit is usually the best starting point because it gives you room to stay consistent. If hunger, training, sleep, and adherence all collapse, the deficit is probably too aggressive even if the calculator says it should work.

Why did my fat loss slow down after a few weeks?

Usually because several things moved at once: a lighter body burns less energy, tracking drift increases, and adaptive changes in expenditure can reduce the original gap. The first deficit estimate is rarely the final one.

Should I eat back exercise calories?

Not automatically. Exercise burn estimates are noisy, and many people already overestimate activity. If you want to add calories back, do it cautiously and judge the result by the multi-week trend rather than the watch number alone.

Can a calorie deficit work without tracking every calorie?

Yes, sometimes. But the plan still needs some way to stay honest, whether that is calorie counting, repeated meals, portion control, body-weight trend review, or another form of self-monitoring.

Do I need to count calories forever?

No. Many people count closely for a while, learn the portion sizes that matter, and then move to lighter monitoring. The goal is not permanent obsession. The goal is a level of awareness that keeps your intake from drifting without you noticing.

Research and sources

  1. Hall KD. What is the required energy deficit per unit weight loss?

    PubMed

    Explains why the old static 3,500-kcal rule is only a starting approximation.

  2. Hall KD, et al. Quantification of the effect of energy imbalance on bodyweight.

    PubMed Central

    Useful for the dynamic-energy-balance idea that weight change does not behave like simple linear spreadsheet math.

  3. Müller MJ, Bosy-Westphal A. Adaptive thermogenesis with weight loss in humans.

    PubMed

    Review of how energy expenditure can fall beyond what body-composition change alone would predict.

  4. Burke LE, Wang J, Sevick MA. Self-monitoring in weight loss: a systematic review of the literature.

    PubMed

    Behavioral review showing that self-monitoring is a central part of effective weight-loss programs.

  5. Lichtman SW, et al. Discrepancy between self-reported and actual caloric intake and exercise in obese subjects.

    PubMed

    Classic study documenting large gaps between reported intake and measured behavior in some participants.

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