New Mental Challenges Can Sharpen Aging Brain: Study

Older adults who learned demanding skills showed better memory power than those who had no active learning

Overactive Thyroid Linked to Breast Cancer Risk

But researchers added that their study did not prove cause-and-effect

Study Counters Stereotypes About Native Americans and Alcohol

They're less likely to drink than whites, and have similar rates of problem drinking, survey finds

Study Links Child Abuse, Neglect to Earlier Onset of Bipolar Disorder

Researchers also found greater risk of suicide and more severe manic and depressive symptoms

Valentine's Day Can Still Be Sweet for Loved Ones With Diabetes

Flowers, jewelry or an outdoor excursion can make the holiday romantic, expert says

Varied Diets May Not Curb Childhood Obesity, Study Suggests

Kids given more food diversity might be heavier, researchers find

Weakened Knees a Big Cause of Falls for Older People: Study

But treatments to improve strength, balance may guard against injuries, disability, researchers say

CDC Reports Link Between Zika Virus and Microcephaly

Germ found in tissues of 2 Brazilian babies who died from the birth defect marked by undersized heads, brains

Dogs' IQs Can Vary, Study Shows

Canines also exhibit signs of dementia that might help shed light on memory, thinking problems in humans

Flu Shot May Guard Against Irregular Heart Rate: Study

Vaccination was associated with fewer cases of atrial fibrillation, but more research is needed, authors say