[Gem]

Deb merely points out anecdotes don't make quantitative data, so it's not useful for statistical analysis, mostly because anecdotal evidence is rife with confirmation bias, and people will deny hard factual evidence rather change their minds. Vegans are at least as likely to do that. For example, there are many papers in the literature which point out the health concerns due to vegan diets, such as calcium, D3, zinc and B12 deficiencies, and vegans tend to point out the poor health of meat eaters (statistically) ignoring confounding factors such as consumers of meat include almost all consumers of 'junk food', obesity, smokers, drinkers and other drug addicts, wheres these are statistically uncommon in the vegan population.