送交者: bgy 于 2010-08-24, 21:25:43:
During her time at Harvard, which began with a year as a research fellow at the School of Public Health under Stare professor of epidemiology and nutrition Walter Willett, she and her colleagues have conducted two pilot studies. The first compared American milk (whole, whole organic, skim, and “shelf-stable” ultra-high temperature milk) to milk from Mongolia. Levels of hormones and growth factors were low in both American skim milk (hormones are carried in the milk fat) and Mongolian milk. In a subsequent study, Mongolian third-graders were fed U.S. commercial milk for a month. The good news was that a number of the children who had been vitamin D-deficient when the study began saw those deficiencies corrected. “Milk is a complex food that contains many good things, such as vitamin B, vitamin D, and calcium,” Ganmaa notes. But the Mongolian schoolchildren’s growth- hormone levels shot up 40 percent; and the children grew, on average, one centimeter during the month—a statistically significant increase, according to Ganmaa. “But we don’t know if it will be sustained in the long term, whether it will affect their sexual maturation or their age at puberty,” she says. “One month is too short.” She and her Harvard colleagues are now seeking funding for a two-year study.