Woody Harrelson, a vegan for over three decades, initially switched to a dairy-free diet in his mid-20s to clear up acne, later eliminating meat and fish and adopting a raw vegan diet. Though his motivations were initially energy-driven, they evolved to include animal rights and environmental causes. Harrelson's passion for veganism has influenced several of his co-stars, including Sadie Sink, Thandiwe Newton, and Liam Hemsworth.

Sadie Sink, best known for her role in Stranger Things, was already a vegetarian when she met Harrelson and his family during the filming of The Glass Castle, which encouraged her to go vegan. Thandiwe Newton, who starred with Harrelson in Solo: A Star Wars Story, also made the switch to veganism after working with him. Similarly, Liam Hemsworth credited Harrelson for inspiring his own vegan lifestyle during their time together on The Hunger Games, even though he later returned to eating meat. Harrelson's influence as a vocal advocate for veganism has had a tangible impact on those around him, showing the power of leading by example in promoting plant-based diets.