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Lose weight sustainably: what the science says

IRIS Prévention
23 December 2026
Losing weight is not the hardest thing: the real challenge is keeping it off. Science shows what makes the difference over time.

There is no shortage of miracle methods for losing weight, but their results are rarely lasting. However, the research is clear on one point: lasting weight loss relies less on strict diets and more on gradual and sustainable changes. Here's what we really know.

1. Why strict diets fail

Very restrictive diets cause weight loss in the short term, but the body adapts: metabolism slows down, hunger increases. When stopping, recovery is frequent, often beyond the initial weight. This is the famous yo-yo effect.

2. What works over time

PrincipleWhy it works
Incremental changesStable over the long term
Non-restrictive balanced feedingAvoid frustration and breakdowns
Regular physical activityPreserves muscle mass
Sleep and stress managementRegulate appetite

What people who maintain their weight loss have in common is regular habits rather than intense, one-off efforts.

3. The key role of physical activity

If diet plays the biggest role in weight loss, physical activity is key to maintaining it. It helps preserve muscle mass, regulate appetite and prevent recovery. Moving is one of the best predictors of posture.

4. Aim for health rather than numbers

Setting a realistic goal, valuing health progress (energy, sleep, physical condition) rather than just the number on the scale, and showing kindness promote success. A moderate but sustained loss already brings real benefits.

    • Set realistic and progressive goals
    • Move regularly to maintain results
    • Value health progress, not just weight

For personalized support, the doctor or a dietitian can offer a suitable and sustainable approach.

💡 tips to remember

    • Very restrictive diets often fail: the metabolism adapts, hunger increases, and recovery is frequent (yo-yo effect).
    • Sustainable weight loss relies on gradual, sustainable changes, not intense, one-off efforts.
    • Diet plays the biggest role in weight loss, but physical activity is key to maintaining it.
    • I aim for health rather than just the number: energy, sleep and physical condition are better benchmarks.
    • A moderate but maintained loss already brings real benefits: personalized support helps to persist over time.