Does Weight Loss Impact Voice Quality in Obese Individuals

Abstract

Background: Obesity causes changes in the vocal tract. Aims and Objectives: to investigate the impact of obesity and weight loss on voice. Methods: The study involved 12 obese and 8 nonobese participants. Weight, body mass index, and body fat percentage were assessed. Voice parameters were measured, including maximum phonation time, fundamental frequency (F0), jitter, shimmer, and the noise-to-harmonics ratio. The Voice Handicap Index-10 was utilized for self-assessment. After 3 months, voice parameters were reassessed, and the changes were correlated with body mass index. Results: The obese group demonstrated significant weight loss and decreased body fat percentage. Maximum phonation time was lower in the obese group but increased after weight loss. F0 did not differ between groups at baseline but increased in the obese group following weight loss. Jitter values were similar between groups but decreased in the obese group. Shimmer was higher in the obese group at both baseline and follow-up, but it showed a significant decrease. Voice handicap index-10 scores were significantly higher in the obese group and decreased markedly. Conclusions: Obesity is linked to changes in MPT and disturbance. Dietary intervention leads to enhancements. Significance: This is the first study evaluating the effect of losing weight with diet on voice. © 2025 by Mutaz B. Habal, MD.