Tā kāishǐ chángshì zhíwùjīyǐnshí gǎishàn jiànkāng.
He started trying a plant-based diet to improve his health.
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植物基 ('plant-based') is a newer loan-concept distinct from 素食 (vegetarian): it emphasizes whole plant foods but doesn't strictly forbid animal products. Common in modern nutrition and food-tech marketing.