Muscle Mass Loss

Definition

Reduction of muscle tissue due to insufficient calorie deficit, inadequate protein intake, or lack of strength training. This is a common undesirable consequence of weight loss diets.

How it works

Muscles are active tissues that consume energy at rest. During a calorie deficit, the body uses them as a source of energy if it lacks protein or stimulus from exercise. This loss reduces basal metabolism by 10-15% per kilogram of muscle lost, making future diets more challenging. It also affects strength, endurance, and physical appearance, creating a less favorable body composition even with normal weight.

Role

Reduces basal metabolism and compromises the quality of weight loss.

Examples

• Low-protein diet losing 5 kg of which 2-3 kg of muscle
• Rapid weight loss with fatigue and weakness
• A 'flacid' appearance despite weight reduction

Recommendations

Maintain a protein intake of 1.6-2 g per kilogram of body weight during a diet. Engage in strength training 3-4 times a week and limit the calorie deficit to 500 kcal/day to preserve muscle mass.

Key takeaway

Protecting muscle mass is crucial for maintaining a healthy metabolism and favorable body composition.

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