我在健康咨询过程中，经常提醒人们“少外出用餐，少食灌头或灌装食品”。因为这些食品不仅用料上无从考究或查证，即质量难保，且经常含有防腐剂，甚至从包装器具上脱落下来的某些化学成份亦可能污染食品，而对人体有害。

日前，美国哈佛大学公共卫生学院的研究人员发布实验报告指出，与食用自制的新鲜的蔬菜汤者比较，食用金属灌装汤料者尿中有害于健康的二联酚Ａ（bisphenol A，BPA）显著增加，较前者高出1200％。

已知在食品加工工业，二联酚Ａ经常被用于涂布于那些日后用于装填食品或饮料的金属灌或瓶内侧。已有研究证实，二联酚Ａ易导致肥胖、糖尿病，且对心血管系统有害和可能干扰实验动物的生殖能力。

基于上述资讯，彭博建议大家在平时尽量少食用金属灌装食品，以有益于自身和家人的健康。

BPA Levels Spike After Eating Canned Soup: Study

Urinary levels of the chemical went up 1,200 percent

TUESDAY, Nov. 22 (HealthDay News) -- A new study says that regular consumption of canned soup may be associated with an increase in levels of bisphenol A (BPA), which has been associated with a number of harmful health effects.

　　The study authors added that the increase may be temporary and more research is needed.

　　BPA is an endocrine-disrupting chemical used in the lining of metal food and beverage cans, in polycarbonate bottles, and dentistry composites and sealants. It's been linked with diabetes, obesity and cardiovascular disease in humans and has been shown to interfere with reproductive development in animals.

　　The Harvard School of Public Health study included 75 volunteers in two groups. One group ate a 12-ounce serving of vegetarian canned soup each day for five days and the other group ate the same amount of fresh vegetarian soup daily for five days. The groups then switched the type of soup they ate for another five days.

　　Urine samples showed that daily consumption of canned soup was associated with a more than 1,200 percent increase in BPA, compared to eating fresh soup.

　　The study appears online Nov. 22 and in the Nov. 23 print issue of the Journal of the American Medical Association.

　　"Previous studies have linked elevated BPA levels with adverse health effects. The next step was to figure out how people are getting exposed to BPA. We've known for a while that drinking beverages that have been stored in certain hard plastics can increase the amount of BPA in your body. This study suggests that canned foods may be an even greater concern, especially given their wide use," lead author Jenny Carwile, a doctoral student in Harvard School of Public Health's epidemiology department, said in a university news release.

　　She and her colleagues noted that the elevation in urinary BPA levels may be temporary and said further research is needed to determine how long it lasts.

　　"The magnitude of the rise in urinary BPA we observed after just one serving of soup was unexpected and may be of concern among individuals who regularly consume foods from cans or drink several canned beverages daily. It may be advisable for manufacturers to consider eliminating BPA from can linings," senior author Karin Michels, an associate professor in the epidemiology department, said in the news release.

SOURCE: Harvard University, news release, Nov. 18, 2011