如何简练“eating vitamin reduces the risk of heart disease among those people eating vitamin”此外：请问如何说“将这些服用了维生素的人编为A组,没服用的编为B组”

the risk of heart disease is reduced among those people eating vitamin
distribute the people eating vitamin into group A, while those not eating vitamin into group B

people eating vitamin have the risk of heart disease reduced
将这些服用了维生素的人编为A组，没服用的编为B组
People eating vitamin are classified as Group A while those not eating vitamin are classified as Group B.

这句有两个问题,“吃维生素”的“吃”一般用take而不用eat；among后面的意思跟前面重复了,因此要去掉.
Taking vitamins reduces the risk of heart disease.
第二句：
Mark those who take vitamins as group A,the opposite as group B.

among those people eating vitamin
怀疑少了个not
among those people not eating vitamin
eating vitamin reduces the risk of heart disease among those people eating vitamin
服用维生素的人比不服用维生素的人患心脏病的几率低得多。
将这些服用了维生素的人编为A组，没服用的编为B组
Form the people who have eaten Vitamin into group A and who have not into group B.