Is Plant-Rich Diet good for longevity?

Yes — the evidence for this is strong. Large cohort studies, including UK Biobank and Nurses' Health Study data, along with a systematic review and meta-analysis on chronic kidney disease, consistently associate plant-rich dietary patterns with lower mortality and reduced risk of major chronic diseases, particularly when the plant foods are minimally processed and nutrient-dense rather than refined. That's reflected in an evidence score of 78/100 for its role in longevity, drawn from 10 studies, with an estimated impact on longevity rated substantial (82/100).