I could well imagine that there are there are strong selection effects at play (more health-concerned people being more likely to give veganism a shot), and the positive effects of the diet just outweighing the possible slight increase in plant oil usage. And I wouldn’t even be so sure if vegans on average consume more plant oil than non-vegans—e.g. vegans probably generally consume much less processed food, which is a major source of vegetable oil.
I could well imagine that there are there are strong selection effects at play (more health-concerned people being more likely to give veganism a shot), and the positive effects of the diet just outweighing the possible slight increase in plant oil usage. And I wouldn’t even be so sure if vegans on average consume more plant oil than non-vegans—e.g. vegans probably generally consume much less processed food, which is a major source of vegetable oil.