视角。精准营养正处于十字路口：从生物预测到情境实施。

Precision nutrition has substantially reshaped nutritional science by demonstrating that individuals can respond differently to identical dietary exposures. Advances in genomics, metabolomics, proteomics, microbiome research, wearable technologies, digital health, and artificial intelligence have improved our ability to characterize biological heterogeneity and predict individual responses to diet. However, demonstrating such variability does not necessarily result in nutritional strategies that provide clinically meaningful benefits beyond established evidence-based care. A critical distincti