A study of about 21,800 people in two UK birth cohorts linked lifetime psilocybin or LSD use with pro-environmental attitudes and a greater likelihood of a vegetarian diet.

Teixeira et al. analysed two UK birth cohorts and found that lifetime classic psychedelic use was associated with more pro-environmental attitudes and higher odds of adopting a vegetarian diet. Psilocybin users reported more salads and raw vegetables, fewer biscuits and cakes, and less red meat.