The ability to perform everyday activities free of debilitating symptoms profoundly affects quality of life as we age. In a new study, older adults who took a daily multivitamin had significantly better measures of functional health after 3 years compared with those who took a placebo.

Prebiotic sodas have become more popular in recent years, with a wave of new products promising gut health benefits and low-calorie enjoyment. According to a new analysis, however, many of these beverages contain relatively little prebiotic fiber content and more sugar than marketing claims might imply.

Lithium in drinking water is a widespread and persistent source of human exposure across Tribal communities in the Western United States, according to a new study. The findings document substantial regional variation in exposure and provide some of the strongest evidence to date that household drinking water is a major contributor to lithium levels measured in the body.