The Vegan Society describes veganism as "the fastest-growing lifestyle movement," with demand for vegan and vegetarian food increasing ten-fold last year.
Research by Ipsos Mori in 2016 suggested at least 542,000 people - or 1.05% of the 15-and-over population in England, Scotland and Wales - were following a vegan diet.
Ten years earlier the estimated number of vegans was just 150,000.
The society says it does not condone any illegal activity, but provides evidence-based information on issues related to veganism. It is currently funding academic research to understand what prevents people from being vegan and how best to make them change.
But some vegan activists are calling farmers who have raised animals for generations murderers for killing animals, or rapists for taking their milk.
Are vegans the new BLM?
Would they change their tunes if they tried a BLT?