Association between dietary fiber intake and atherosclerotic cardiovascular disease risk in adults: a cross-sectional study of 14,947 population based on the National Health and Nutrition Examination Surveys

Background This study aimed to investigate the association between dietary fiber intake and long-term cardiovascular disease (CVD) risk based on the National Health and Nutrition Examination Survey (NHANES) database. Methods A total of 14,947 participants aged 20-79 from the NHANES database were included in this study between 2009 and 2018. The atherosclerotic cardiovascular disease (ASCVD) score was utilized to predict the 10-year risk of CVD in individuals (low, borderline, intermediate, and high risk). Weighted univariate and multinomial multivariate logistic regression analyses were used to analyze the association between dietary fiber intake and long-term CVD risk. Results Higher dietary fiber density may be associated with a reduced ASCVD risk in participants with intermediate risk [odds ratio (OR) = 0.76; 95% confidence interval (CI), 0.61-0.94] and high risk (OR = 0.60; 95%CI, 0.45-0.81) compared with those in the group with low risk. Higher total dietary fiber intake may also reduce ASCVD risk in participants with high risk (OR = 0.84; 95%CI, 0.75-0.95). Subgroup analyses showed that higher dietary fiber density may be related to reduced ASCVD risk in intermediate-risk participants aged 20-39 (OR = 0.62; 95%CI, 0.43-0.89) and 40-59 (OR = 0.67; 95%CI, 0.49-0.94). In high-risk participants, higher dietary fiber density may reduce ASCVD risk in 20-39-year-old (OR = 0.38; 95%CI, 0.19-0.77), 40-59-year-old (OR = 0.37; 95%CI, 0.20-0.70), male (OR = 0.47; 95%CI, 0.23-0.97) and female (OR = 0.57; 95%CI, 0.38-0.86) participants. Conclusion Higher dietary fiber density and total dietary fiber intake were associated with a lower long-term CVD risk, especially in the 20-39 and 40-59 age groups, where the reduction was most significant.