Rapid Weight Loss

Definition

Weight loss exceeding 1-2 kg per week, usually resulting from significant calorie deficit or restrictive diet.

How it works

Rapid weight loss is due to excessive calorie deficit, forcing the body to use its energy stores urgently. In these conditions, the body preserves visceral fat first and draws more from muscle. This reduces basal metabolism, causes significant fatigue, and activates the body's weight regulating mechanisms, leading to rapid weight regain once the diet ends.

Role

Causes a rapid change in weight at the detriment of metabolic health and body composition.

Examples

• Extreme intermittent fasting
• Restrictive diet of less than 1200 kcal/day
• Ultra-hyperprotein diet losing 3-4 kg per week

Recommendations

Avoid diets promising rapid weight loss. If rapid weight loss is medically necessary, it should be monitored by a professional with regular follow-ups. Seek sustainability over speed instead.

Key takeaway

Rapid weight loss compromises metabolism and is rarely sustainable without regaining the lost weight.

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