Research Roundup

• Vitamin E supplements may help ward off colds in older people, according to a Tufts University study of 617 nursing home residents.• Overweight and obese postmenopausal women may be able to lower breast cancer risk by exercising to raise levels of high-density lipoprotein (“good” HDL) cholesterol, suggests research from Norway and the U.S. • Vitamin D may help protect against periodontal disease, chronic inflammation of the gums that can lead to tooth loss, suggests a large population study