Association of mainly vegetarian and vegan diets with loneliness, social isolation and social withdrawal in a German population survey - André Hajek; Razak M. Gyasi; Supa Pengpid; Karl Peltzer; Karel Kostev; Pinar Soysal; Ashwin Kotwal; Lee Smith; Dong Keon Yon; Hans-Helmut König (PLoS ONE, 2026)