Abstract
Purpose
To investigate the associations between carbohydrate intake and the risk of overall and specific-cause mortality in a prospective cohort study.
Methods
Diet was measured using 24 h dietary recalls. Underlying cause of death was identified through linkage to the National Death Index. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox proportional hazards regression.
Results
During a median follow-up of 7.1 years among 35,692 participants who aged 20–85 years, a total of 3854 deaths [783 cardiovascular disease (CVD)-specific and 884 cancer-specific death] were identified. Carbohydrate intake was not associated with risk of overall mortality (multivariable-adjusted HR comparing extreme quartiles 1.03, 95% CI 0.94, 1.13, ptrend = 0.799), while higher fiber intake was associated with lower mortality risk (HR 0.86, 95% CI 0.77, 0.95, ptrend = 0.004). Replacing 5% of energy from carbohydrate with both plant fat and plant protein was associated with 13% (95% CI 8%, 17%) and 13% (95% CI 3%, 22%) lower risk of total and CVD mortality, respectively. Whereas a positive or null association was found when replacing carbohydrate with both animal fat and animal protein. Higher carbohydrate-to-fiber ratio was associated with increased risk of overall (HR 1.20, 95% CI 1.09, 1.33, ptrend < 0.001) and cancer-specific (HR 1.17, 95% CI 0.95, 1.44, ptrend = 0.031) mortality.
Conclusions
Our findings suggested that high fiber diet or diet with low carbohydrate-to-fiber ratio was associated with lower long-term death risk, and provided evidence for the health benefit from dietary substitution of both plant fat and plant protein for carbohydrate.
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Data availability
Data described in the manuscript, code book, and analytic code are publicly and freely available without restriction at https://www.cdc.gov/nchs/nhanes/index.htm.
Code availability
SAS version 9.4.
References
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Funding
This work was supported by the National Natural Science Foundation of China (82073651), Anhui Provincial Natural Science foundation (2008085MH262 and 2108085QH357), Anhui Provincial Education Department (gxyqZD2021099), and grants from Anhui Medical University (2021xkjT007, 2020lcxk033, XJ201935, and 2019xkj161).
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XZ, XL, and HL had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: WY and JH. Acquisition, analysis, or interpretation of data: all authors. Drafting of the manuscript: XZ, XL, and WY. Critical revision of the manuscript for important intellectual content: all authors. Statistical analysis: XZ and XL. Obtained funding: WY. Administrative, technical, or material support: WY. Study supervision: WY.
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The NCHS Research Ethics Review Board approved the NHANES study protocols at https://www.cdc.gov/nchs/nhanes/irba98.htm.
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Zeng, X., Li, X., Zhang, Z. et al. A prospective study of carbohydrate intake and risk of all-cause and specific-cause mortality. Eur J Nutr 61, 3149–3160 (2022). https://doi.org/10.1007/s00394-022-02877-0
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DOI: https://doi.org/10.1007/s00394-022-02877-0