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>1.2. Vegan studies are low quality and hide their conflicts of interest
The supposed science around veganism is highly exaggerated. Nutrition science is in its infancy[1] and the "best" studies on vegans rely on indisputably and fatally flawed[2] food questionnaires that ask them what they eat once and then just assume they do it for several years:
1) Vegans aren't even vegan. They frequently cheat[3] on their diet and lie[4] about it
2) Self-imposed dieting is linked to binge eating disorder[5], which makes people forget and misreport about eating the food they crave.
3) The vast majority of studies favoring vegan diets were conducted on people who reported to consume animal products[6] and by scientists trained at Seventh-day Adventist universities{7]. They have contrasting results when compared to other studies[8]. The publications of researchers like Joan Sabate[9] and Winston Craig[10] (reviewers and authors of the AND position paper, btw) show that they have a bias towards confirming their religious beliefs[11]. They brag about their global influence on diet, yet generally don't disclose this conflict of interest. They have pursued[13] people for promoting low-carbohydrate diets.
4) 80-100% of observational studies are proven wrong[14] in controlled trials.