Why do I feel like I'm about to catch a cold whenever I lose weight?

Feeling like you're catching a cold every time you lose weight is mainly due to temporary declines in immunity, insufficient nutrient reserves, metabolic imbalances, weakened thermoregulation, and impaired bodily defenses caused by excessive fatigue. Rapid weight loss easily disrupts the body's internal balance. If frequent colds are accompanied by persistent fatigue or sudden weight loss, prompt medical attention is recommended.

1. Temporary decline in immunity: Rapid weight loss may reduce the number or activity of immune cells, weakening the body's ability to fight off viruses and bacteria. Pathogens that normally wouldn't cause illness may then trigger cold-like symptoms.

2. Insufficient nutrient reserves: Excessive dieting during weight loss can lead to inadequate intake of proteins, vitamins, and other nutrients, impairing the synthesis of immunoglobulins and weakening the respiratory mucosal barrier, thereby increasing the risk of cold infections.

3. Metabolic dysregulation: Rapid weight reduction can disrupt endocrine and metabolic rhythms, increasing the body's stress response and elevating cortisol levels. Prolonged stress states can suppress immune function.

4. Weakened thermoregulation: Fat is an important tissue for heat production and insulation. Rapid fat loss may impair the body's ability to regulate temperature, making it more sensitive to cold stimuli and increasing the likelihood of catching a cold due to chilling.

5. Excessive fatigue impairing defense: Combining weight loss with high-intensity exercise may lead to excessive energy expenditure. Without adequate recovery, the body remains in a state of fatigue, creating vulnerabilities in the immune system and making it easier for viruses to invade.

When experiencing a cold, ensure ample rest and sleep, drink plenty of water to stay hydrated, and maintain a light yet balanced diet rich in protein and vitamins. Avoid extreme dieting or intense exercise during weight loss. Instead, aim for gradual weight reduction combined with moderate physical activity to improve overall health and boost immunity.