Published: 2026-02-13 Updated: 2026-02-13
Editorial note
Map of Health content is prepared with an evidence-based approach. References are provided for transparency.
Medical disclaimer
This content is for informational purposes only and does not replace professional medical advice, diagnosis, or treatment. If you have an urgent medical concern, seek immediate care.
"Losing weight is about burning fat, not sacrificing your muscles. If you lose muscle mass, your metabolism slows down, making it harder to keep the weight off (the "yo-yo effect")."
How to Lose Weight Without Losing Muscle

1. Moderate Calorie Deficit

Don't starve yourself. If the deficit is too aggressive, your body enters "energy-saving mode" and starts breaking down muscle tissue for fuel.

  • The Rule: A deficit of 500 calories per day is usually ideal.

  • For Women: Start with a 300-calorie deficit, as women generally have lower basal metabolic rates.

2. The Muscle Essentials: Protein and Water

Muscle is a "luxury" tissue for the body; you must provide the right nutrients to keep it.

  • Protein: Consume 1.4 to 2.0 grams of protein per kilogram of body weight. At least one-third of your meal should be a protein source.

  • Water: Muscle is approximately 70% water. Drink 30 to 40 ml of water per kilogram of body weight to maintain muscle volume and efficiency.

3. Smart Strategy

Avoid sudden glucose spikes and focus on high-quality nutrition combined with physical activity. This forces the body to use fat reserves as a primary fuel source instead of "expensive" muscle tissue.


Summary: Eat enough protein, stay hydrated, and keep your calorie deficit moderate. Don't let your body treat your muscles like a cost-cutting measure in a crisis.