In Egypt, where flax has been cultivated for a good 4,000 years, scientists at the National Research Center in Cairo have found that flaxseed prevents osteoporosis. At this point, the researchers know only that flaxseed promotes bone density in rats, not in people, but there's a good chance that human bones can benefit also. Readers who enjoy medical jargon can read an abstract of their work in the ever-snappy International Journal of Food Safety, Nutrition and Public Health. Wikipedia reports that other research suggests that flaxseed can lower cholesterol levels, especially in women, and may benefit people suffering from breast cancer or prostate cancer.