Doctor Warns Against Calorie-Only Weight Loss: Risk of Muscle Loss and 'Puff Person' Syndrome

Dr. Zhou Jian-an, a specialist in metabolism and weight loss, cautions that many individuals seeking weight loss have a mix of visceral and subcutaneous fat. Relying solely on calorie reduction can lead to muscle loss, resulting in a 'puff person' physique where body fat remains high despite weight loss. He cited a case of a 30-year-old woman who lost 15kg in 3 months on a diet under 600 kcal/day but experienced rapid rebound, fatigue, hair loss, brittle nails, and irregular menstruation. Her body composition analysis showed 46% body fat and significant muscle loss. Dr. Zhou explained that subcutaneous fat is soft and affects appearance, while visceral fat is firm, accumulates around organs, and is strongly linked to diabetes and cardiovascular diseases. A systematic review of 732 overweight or obese individuals found that diet alone led to 2.57kg more weight loss than exercise alone, and a combination of diet and exercise over 12 weeks resulted in 2.85kg more weight loss than exercise alone, with significant visceral fat reduction. Dr. Zhou recommends a 'diet first, exercise second' approach, focusing on reducing visceral fat and preventing muscle loss. This includes adjusting dietary ratios to stabilize insulin and metabolism, and ensuring sufficient protein intake to maintain metabolic rate. He stresses improving metabolic health over just weight numbers and advises seeking professional assessment if weight loss stalls or body shape doesn't improve.