A quarter die from eclampsia, which is a problem related to high blood pressure.

VOA: standard.2009.11.10

They use food frequency questionnaires, which I mentioned before, surveys, and then biological markers like blood tests of certain things to see how diet is related to health.

研究员还运用食物频率调查表,我之前曾提到过,各类调查以及生物标志物,像是血液检测等手段,来研究饮食与健康之间的关系

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选