正常饮食

• The groups then gae more blood samples and switched their original diet assignments : those who had been in the comparison group were asked to eat watercress for eight weeks ; those who were preiously assigned to eat watercress were told to follow their normal diet , with no watercress requirements
  然后小组中的受试者们再提供一次血样并且掉或他们的饮食安排：那些对照受试者被要求吃八周豆瓣菜；那些先前吃豆瓣菜的受试者则继续他们的正常饮食，但没有给他们提供豆瓣菜。