Also known as: vegetarian, vegetarian diet, lacto-ovo vegetarian
Latest evidence update: 2026-12-11
Strongest in Sample size (78). Held back by Replication (31).
Solid mix of RCTs with some methodological gaps.
Few independent replications; results not yet robust.
Tens of thousands of participants pooled across studies.
Mixed direction across studies.
Healthy mix of recent and established research.
No quantified outcomes yet. Once we have studies with measurable endpoints, you will see per-outcome magnitude here.
Vegetarians and vegans were similarly associated with orthorexia nervosa symptoms compared with omnivores (no significant difference between vegetarian and vegan groups).
Adults following vegetarian and/or vegan diets had moderately higher orthorexia nervosa symptoms compared to omnivores.
Vegetarian and vegan diet adherents were approximately twice as likely to report orthorexia nervosa symptoms as omnivores.
12 weeks of high-intensity interval training increased whole-muscle carnosine content from 15.8 to 20.6 mmol/kg dry muscle in vegetarian men with no dietary beta-alanine intake.
The sustainable lifestyle arm set more dietary goals related to ecological and vegetarian foods compared to the healthy lifestyle arm.
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