These microbes play an important role in maintaining oral homeostasis, protecting the oral cavity, and preventing disease development.

这些微生物在维持口腔内动态平衡、保护口腔与预防疾病等方面起到了重要作用。

But when it comes to understanding which foods are the best choices, much nutrition research has focused on how certain foods or nutrients may have a negative effect on health, or even play a role in disease development.

但在了解哪些食物是最佳选择时，许多营养研究都集中在某些食物或营养素如何对健康产生负面影响，甚至在疾病发展中发挥的作用。