研究人员警告说，不管叶酸来源于哪里，每天的摄入量一旦超过1毫克，就会导致身体暴露在未经分解的叶酸之中。
The researchers warn that intakes of folic acid of more than 1mg a day, from whatever source, will increase the body’s exposure to circulating unmetabolised folic acid.
他说，“当你达到350毫克的水平，这就离死亡不远了”。
"When you have levels of 350mg, it is associated with fatalities," he said.
美国北达科他州立大学的马蒂•马尔凯洛Marty Marchello博士说：“3又1/2盎司未烹调的生牛肉含铁大约3毫克，所含脂肪还少于3毫克。”
"The iron content is about 3 milligrams in a 3 1/2-ounce uncooked portion, " says Marty Marchello, Ph.D., at North Dakota State University. "That portion contains less than 3 grams of fat."
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