https://www.nhs.uk/live-well/eat-well/the-vegan-diet/

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/vegetarian-diet/art-20046446

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5216044/

https://www.bbcgoodfood.com/howto/guide/what-pescatarian-diet

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5902736/