What's your best argument against veganism?

1) There are many health authorities that explicitly advise against vegan diets, especially for children. [1]

2) The Academy of Nutrition and Dietetics was founded by Seventh-day Adventists[2], an evangelistic vegan religion[3] that owns meat replacement companies. Every author of their position paper[4] is a career vegan, one of them is selling diet books that are cited in the paper. One author and one reviewer are Adventists who work for universities that publicly state[5] to have a religious agenda. Another author went vegan for ethical reasons[6]. They explicitly report "no potential conflict of interest". Their claims about infants and athletes are based on complete speculation (they cite no study following vegan infants from birth to childhood) and they don't even mention potentially problematic nutrients like Vitamin K[7] or Carnitine[8].

3) Many, if not all, of the institutions that agree with the AND either just echo their position, don't cite any sources at all, or have heavy conflicts of interest. E.g. the Dietitians of Canada wrote their statement with the AND[9], the USDA has the Adventist reviewer in their guidelines committee[10], the British Dietetic Association works with the Vegan Society[11], the Australian Guidelines cite the AND paper as their source[12] and Kaiser Permanente has an author that works for an Adventist university[13].

4) In the EU, all nutritional supplements, including B12, are by law[14] required to state that they should not be used as a substitute for a balanced and varied diet.

5) In Belgium, parents can get imprisoned[15] for imposing a vegan diet on children.

[1] https://pastebin.com/g72uMQr9

[2] https://vndpg.org/resources/academy-co-founder-lenna-frances-cooper/ [3] https://www.mdpi.com/2077-1444/9/9/251/htm

[4] https://www.eatrightpro.org/-/media/eatrightpro-files/practice/position-and-practice-papers/position-papers/vegetarian-diet.pdf

[5] https://i.imgur.com/wabV8au.jpg

[6] https://en.wikipedia.org/wiki/Vesanto_Melina#Career

[7] https://www.ncbi.nlm.nih.gov/pubmed/19748244

[8] https://www.ncbi.nlm.nih.gov/pubmed/6703771

[9] https://www.ncbi.nlm.nih.gov/pubmed/12778049

[10] https://www.nutritioncoalition.us/news/2020-dietary-guidelines-committee

[11] https://www.bda.uk.com/resource/british-dietetic-association-confirms-well-planned-vegan-diets-can-support-healthy-living-in-people-of-all-ages.html

[12] https://www.eatforhealth.gov.au/sites/default/files/content/n55_australian_dietary_guidelines.pdf#page=48