But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom MacDonald, professor of immunology at BartsAnd the London medical school.

但是55岁后肠道，尤其在大肠中的益生菌含量明显下降，免疫学教授Tom MacDonald介绍说。

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But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom MacDonald, professor of immunology at BartsAnd the London medical school.

但是55岁后肠道，尤其在大肠中的益生菌含量明显下降，免疫学教授Tom MacDonald介绍说。

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