CHAMPAIGN, Ill., June 7 (UPI) -- A single 20-minute session of Hatha yoga improved brain function better than moderate to vigorous aerobic exercise, U.S. researchers say.

SEATTLE, May 24 (UPI) -- U.S. adults and teens who used calorie information posted on menus purchased up to 143 fewer calories than those who did not see the calories, researchers say.

ATLANTA, May 7 (UPI) -- An estimated 3 million Americans are living with hepatitis C and about 75 percent don't know they are infected, U.S. health officials estimate.

TORONTO, May 5 (UPI) -- Mexican-Americans born in the United States age 55 and older are more likely than immigrants to report physical limitations, researchers say.

ATLANTA, May 4 (UPI) -- Most adults with arthritis do no or little walking, but it is an effective and safe way to achieve proven arthritis relief, U.S. officials say.

The Centers for Disease Control and Prevention's Morbidity and Mortality Weekly Report said for adults with arthritis physical activity is an essential self-management strategy proven to reduce pain and increase function.

"Walking is a low impact, acceptable and feasible way of obtaining these benefits and one preferred by those with arthritis, in part because it can be done in bouts as short as 10 minutes," the report said.

"However, almost two-thirds of adults with arthritis report no or low fewer than 90 minutes walking per week." Community-based programs, such as Walk With Ease, are available to help adults with arthritis increase their walking, CDC officials said.

Public health efforts that link such programs with environmental/policy strategies that increase access to safe walking environments and communication campaigns that build awareness of the benefits of walking can help adults with arthritis increase their walking, the report said.

BERKELEY, Calif., May 2 (UPI) -- Earlier research found heavy metals in makeup, but U.S. researchers analyzed lipsticks and lip glosses and measured the mineral levels to determine health risk.