Objective To investigate the effect of dietary habits on comorbid sarcopenia occurrence in patients with chronic respiratory diseases and develop a risk model in order to provide reference for development of future intervention programs. Methods A total of 328 patients (age ≥45 years) with chronic respiratory diseases admitted to the outpatient and inpatient departments of respiratory diseases of the First Affiliated Hospital of Xinjiang Medical University from May to September 2021 were recruited in the study. SPSS statistics 25.0 and the glm and rms software packages in R 4.0.5 software were applied for data analysis. Chi-square test or Fisher′s exact probability test was used for intergroup comparison depending on different data type. Logistic regression model was employed to analyze the factors influencing comorbid sarcopenia in the patients with chronic respiratory diseases. The predictive value of each risk factor for comorbid sarcopenia was analyzed with receiver operating characteristic (ROC) curves, and a Nomogram was plotted for visualization. Results The prevalence of sarcopenia was 25.0% in the cohort. Logistic regression analysis showed that female (OR=18.44,95%CI 8.05-42.24), advanced age (≥70 years, OR=6.26,95%CI 2.51-15.61); BMI <18.5 kg/m² (lean; OR=6.26,95%CI 2.51-15.61), pure juice/vegetable juice intake for 1 to 3 times per week (OR=13.34,95%CI 2.16-82.60), nuts intake for 1 to 3 times per month (OR=0.25,95%CI 0.09-0.70), and nuts intake for once per day (OR=0.16,95%CI 0.03-0.80) were influencing factors for comorbid sarcopenia in patients with chronic respiratory disease. Conclusion Female, advanced age, low BMI (lean), fruit and vegetable juice/pure juice, and nuts are all closely associated with sarcopenia. These results provide a scientific basis for accurate assessment and rational dietary intervention in patients with respiratory diseases combined with sarcopenia.