参考资料：
johnston bc, zeraatkar d, han ma, et al. unprocessed red meat and processed meat consumption: dietary guideline recommendations from the nutritional recommendations (nutrirecs) consortium. ann intern med. 2019. doi: 10.7326/m19-1621
vernooij rwm, zeraatkar d, han ma, et al. patterns of red and processed meat consumption and risk for cardiometabolic and cancer outcomes. a systematic review and meta-analysis of cohort studies. ann intern med. 1 october 2019. doi:10 .7326/m19-1583
han ma, zeraatkar d, guyatt g, et al. reduction of red and processed meat intake and cancer mortality and incidence. a systematic review and meta-analysis of cohort studies. ann intern med. 1 october 2019. doi:10.7326/m19-0699
zeraatkar d, han ha, guyatt gh, et al. red and processed meat consumption and risk for all-cause mortality and cardiometabolic outcomes. a systematic review and meta-analysis of cohort studies. ann intern med. 1 october 2019 . doi:10.7326 /m19-0655
zeraatkar d, johnston bc, bartoszko j, et al. effect of lower versus higher red meat intake on cardiometabolic and cancer outcomes. a systematic review of randomized trials. ann intern med. 1 october 2019. doi:10.7326/m19-0622
valli c, rabassa m, johnston bc, et al. health-related values and preferences regarding meat consumption. a mixed-methods sys- tematic review. ann intern med. 1 october 2019. doi:10.7326/m19-1326
new “guidelines” say continue red meat consumption habits, but recommendations contradict evidence. https://www.hsph.harvard.edu
美国居民膳食指南中文版（2015-2020）
