Source, in full
Caption to a video of undercover footage from a factory farm posted on his Facebook page; as quoted in "UFC heavyweight Mark Hunt switching to vegan diet after watching animal cruelty video", in Bloody Elbow (16 August 2015).
Attribution
Quote text and notes from Wikiquote: Mark Hunt (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.