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Preserving your muscles and regaining strength

Losing weight while preserving your strength: body composition, protein, strengthening exercise and rehabilitation after surgery.

Key points

When you lose weight, the aim is also to preserve your strength, your mobility and your independence.

Diet and adapted physical activity support this, whether weight loss is achieved with or without medication, or after surgery.

Weight does not tell the whole story

Weight loss can involve fat, but also part of the lean mass. Lean mass includes muscle, water and other tissues: a change in lean mass therefore does not automatically mean an equivalent loss of muscle.

Strength and physical abilities matter as much as the number on the scales.

Understanding your body composition

We use bioelectrical impedance analysis to estimate your body composition. The results are interpreted with the team, taking into account in particular your hydration, your body build and the measurement conditions.

This measurement complements the clinical assessment; it does not directly measure your strength. How it changes over time helps us adapt your support.

Eating enough, in the right way

When appetite decreases, it can become harder to meet your nutritional needs. Dietary support helps maintain adequate intake, particularly of protein.

Advice is tailored to your health, your habits and your treatment. Protein supplements are not routine and do not replace a suitable diet.

Moving to feel more at ease

Walking and endurance activities are useful. Suitable strengthening exercises also help preserve muscle and strength.

Getting up from a chair, climbing stairs or carrying your shopping more easily are concrete goals. Activity can start gradually, according to your abilities.

Enjoying being active is key: choosing an activity you like helps it find a lasting place in your daily life.

After an operation

Returning to activity is organised with the team. Our partnership with Clinique La Lignière means that early rehabilitation after surgery can be considered, depending on your state of health and post-operative instructions.

Medical review of the French version: Dr Pierre Fournier

Scientific sources and references

Sources accessed on 15 October 2026.

  1. Mozaffarian D, Agarwal M, Aggarwal M, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Obesity (Silver Spring). 2025;33(8):1475-503. doi:10.1002/oby.24336. View source
  2. Kyle UG, Bosaeus I, De Lorenzo AD, et al. Bioelectrical impedance analysis—part II: utilization in clinical practice. Clin Nutr. 2004;23(6):1430-53. doi:10.1016/j.clnu.2004.09.012. ESPEN guidelines: reliable estimation when hydration is stable; limited validity when BMI is very high. View source
Author
Prepared for the Centre from the sources cited
References
See “Scientific sources and references” on this page

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