Sweet poison? New doubts cast over safety of erythritol; Comparing whey, soy and pea protein isolates; Ivermectin may prove a new weapon against malaria; In first-ever study, keto diet scores vs. Parkinson’s; Walk away from dementia; Loneliness can kill, but negative social ties can hasten biological aging; Sketchy knockoff weight loss drugs are flooding the marketplace; And more!