Calculate your caloric deficit

Losing weight = spending more than you eat. But by exactly how much? Too aggressive → yoyo effect. Too mild → no progress. Find your balance.

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Caloric deficit: how it works

To lose 1 kg of fat, you need to burn about 7,700 kcal more than you eat. With a deficit of 500 kcal/day, that's ~0.5 kg per week — a healthy and sustainable pace.

A deficit is created in two ways: eating less (reducing portions), or moving more (increasing activity). The ideal is a mix of both.

Which deficit should you choose?

Light deficit (300 kcal/day): the most comfortable. You're less hungry and keep your energy, but results are slow. Ideal if you have little weight to lose or are patient.

Moderate deficit (500 kcal/day): the sweet spot. At ~0.5 kg/week, this is the pace recommended by most health professionals. It's sustainable long-term without major frustration.

Aggressive deficit (700 kcal/day): fast but risky. Expect more fatigue, cravings, and risk of muscle loss. Best reserved for those with significant weight to lose, ideally under supervision.

Avoiding the yoyo effect

The yoyo effect always stems from a deficit that's too brutal and maintained for too long. Your body adapts by slowing your metabolism, increasing hunger, and storing fat more easily once you return to normal eating.

The solution: a moderate deficit, high protein (to protect muscle), strength training, and regular breaks (1 week at maintenance calories every 8-12 weeks).

Questions fréquentes

How long does it take to lose 10 kg?
With a moderate deficit of 500 kcal/day: about 20 weeks (5 months). With a light deficit: about 33 weeks (8 months). Patience is key — lasting results take time.
Can I lose more than 1 kg per week?
It's possible at the beginning (water weight) but not recommended for the long term. Beyond 0.5-0.7 kg/week, you risk losing muscle along with fat.
Should I keep the same deficit all the way through?
No. The more weight you lose, the more your TDEE drops. Recalculate your deficit every 4-6 weeks to maintain the same pace of weight loss.
Can I eat more on the weekend?
Yes, if you balance it out over the week. What matters is the average deficit over 7 days. A small surplus on Saturday offset by a larger deficit during the week = the same result.

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