环境保护署关于无意间吸入灰尘的数据主要关注的是儿童。根据其中一项研究报告,6周到1岁的婴儿通常一天会吸入60毫克灰尘。从1岁到20岁,会增加到每天100毫克。如果以年为单位换算,就是每年36500毫克或1.3盎司。
Kids, as we all know, just love eating dirt, especially between the ages of 1 and 3. One researcher theorized that although childhood dirt-eating certainly is based in curiosity about the world and the new ability to play and grab, it could also be an effort to get some vitamins and minerals. Purposeful dirt-eating usually happens around a year old, which is when many babies stop breastfeeding, so maybe they're trying to regain some of that nutrition.
众所周知,孩子就喜欢吃灰尘,尤其是1-3岁的孩子。一个研究人员系统地指出,虽然儿童时期吃灰尘绝对是出于对世界的好奇,孩子也在锻炼玩和抓的新能力,但这种行为也能使孩子吸收一些维生素和矿物质。有意识地吃土通常发生在一岁左右,这时很多孩子断了母乳,他们可能是在努力摄取一些母乳中的营养。
However, some people keep eating dirt after early childhood, a condition called geophagy, or soil pica (pica is the habit of eating nonfood items). In American culture, geophagy is regarded with concern. Pica, in fact, is a recognized disease by the U.S. Agency for Toxic Substances and Disease Registry, with intentional dirt consumption of 500 milligrams a day qualifying as "pathological". But historically, and in many other cultures, it's not so odd or abnormal to eat dirt. Some pregnant women in sub-Saharan Africa eat dirt to soothe stomach upsets during morning sickness or to add extra nutrients to the developing fetus' body.
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