SAIMSARA Journal

Machine Generated Science • ISSN 3054-3991

Plant-Based and Vegetarian Diets for Weight Loss: A Scoping Review with ☸️SAIMSARA.

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Issue 2, Volume 1, 2026

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• Last update: 2026-03-20 19:46:58
What is this paper about
This paper shows that vegetarian and plant-based diets are not just ethical choices, but practical weight-loss strategies that can also improve insulin sensitivity, blood pressure, liver fat, and lipid profiles. It is worth reading because it maps which plant-based approaches seem to work best, where the evidence is strongest, and why “plant-based” is not one single diet

DOI: 10.62487/saimsarabe015a04


Abstract: This paper aims to systematically evaluate the effectiveness of vegetarian and plant-based dietary patterns in promoting weight loss and improving associated metabolic and clinical markers across diverse populations, as well as to identify key research gaps and future directions. The review utilises 51 original studies with 26724 total participants (topic deduplicated ΣN). Across the mapped evidence, vegetarian and plant-based dietary patterns show a promising signal of clinically meaningful weight reduction, with reported changes spanning roughly −1.40 kg over 6 months to −8.07 ± 4.31 kg over 3 months, and up to −8.9% in more intensive lifestyle programs incorporating a strict vegetarian diet. This weight loss signal commonly co-occurred with improvements in adiposity distribution and cardiometabolic markers, including insulin sensitivity, lipid profiles, and blood pressure, supporting a role for vegetarian patterns as a practical option for obesity management and related conditions such as MASLD/NAFLD and T2DM. The evidence map also indicates that outcomes may vary by vegetarian subtype and implementation (e.g., low-carbohydrate vegan approaches or pairing with time-restricted feeding), suggesting that “plant-based” is not a single intervention and that tailoring may matter. In practice, these patterns appear most actionable when delivered with professional guidance to maintain nutritional adequacy (notably vitamin B12 and iron) and to avoid reliance on ultra-processed “plant-based” foods that may undermine weight goals. Future research should prioritize longer-duration, head-to-head randomized trials that standardize dietary definitions and adherence measurement while clarifying which vegetarian variants best sustain weight loss and metabolic benefits across diverse populations.

Keywords: Vegetarian diet; Weight loss; Plant-based diet; Vegan diet; Obesity management; Metabolic health; Body composition; Dietary intervention; Cardiometabolic risk; Fatty liver disease

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