ALB and obesity due to melanocortin 4 receptor deficiency: The occurrence of sarcopenia was included as the dependent variable, and age, serum albumin level, BMI, waist circumference, hip circumference, biceps circumference, handgrip strength, total water content, protein concentration, inorganic salt content, skeletal muscle mass, basal metabolic rate, obesity degree, InBody score, SMI, and body fat content were included for collinearity diagnosis.