1) & 2)
https://www.nature.com/articles/s41415-020-2476-8
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7482897/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7904017/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8193024/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7266767/
https://onlinelibrary.wiley.com/doi/10.1002/jmv.26514
3)
https://www.sciencedirect.com/science/article/abs/pii/S096007602030296X
https://nutritionj.biomedcentral.com/articles/10.1186/s12937-021-00727-z
https://pubmed.ncbi.nlm.nih.gov/30675873/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/
https://www.news-medical.net/news/20200604/Study
https://www.psychologytoday.com/us/blog/social-instincts/202005/research
https://pubmed.ncbi.nlm.nih.gov/10543583/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3659258/
https://www.mdpi.com/2072-6643/11/4/708
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7172861/
https://pubmed.ncbi.nlm.nih.gov/9701160/
https://pubmed.ncbi.nlm.nih.gov/32319538/
https://pubmed.ncbi.nlm.nih.gov/34368933/
https://pubmed.ncbi.nlm.nih.gov/33572045/
https://pubmed.ncbi.nlm.nih.gov/32754164/Medical
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