Researchers found a type of common gut bacteria sometimes associated with inflammation, abscesses, bowel disease and cancer has a major silver lining: It seems to help prevent cardiovascular disease. The findings suggest the possibility of probiotic treatments for atherosclerosis, the dangerous buildup of fats, cholesterol and other substances in arteries that cause strokes and heart attacks and is linked to smoking, diet, age and a range of genetic causes. Diets heavy in animal-based foods have long been considered a risk factor for cardiovascular disease as such diets are a major source of TMA—trimethylamine—which is converted by the liver to another...