Turmeric, a spice used extensively in Asia as a key ingredient of curry, may be protecting children against leukemia, a scientist said on Thursday. Rates of the blood cancer have been rising steadily for the past 50 years but its incidence in Asia is much lower than in the West. Professor Moolky Nagabhushan, of the Loyola University Medical Center in Chicago, told a conference that factor could be due, at least partly, to turmeric.