Why Nutrition Studies Keep Contradicting Each Other

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It seems like nutrition studies contradict a lot, and it’s practically impossible to get a straight answer on whether a given food or supplement is good for you. But why?

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Sources:
https://www.vox.com/2016/1/14/10760622/nutrition-science-complicated
https://www.vox.com/2015/1/5/7482871/types-of-study-design
http://fivethirtyeight.com/features/you-cant-trust-what-you-read-about-nutrition/
https://www.hsph.harvard.edu/nutritionsource/media-full-story/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2921609/#R46
https://academic.oup.com/advances/article/7/2/383/4558081
https://academic.oup.com/advances/article/7/1/44/4524046
https://www.ncbi.nlm.nih.gov/pubmed/23934737
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3065151/
https://www.washingtonpost.com/national/health-science/drinking-red-wine-is-good-for-you–or-maybe-not/2017/12/01/49f55e7a-cbd3-11e7-aa96-54417592cf72_story.html?utm_term=.aa32598b01df
https://link.springer.com/article/10.1007%2Fs00018-014-1808-8
https://academic.oup.com/alcalc/article/48/3/270/244770
https://content.iospress.com/articles/clinical-hemorheology-and-microcirculation/ch1424
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4346286/

Image Sources:
https://en.wikipedia.org/wiki/Resveratrol#/media/File:Resveratrol3d.png
https://en.wikipedia.org/wiki/Beta-Carotene#/media/File:Beta-Carotene-3D-spacefill.png

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