Common Sugar Substitute Linked to Higher Risk of Heart Attack and Stroke, Study Finds | #xylitol heart attack risk # xylitol stroke risk # xylitol cardiovascular risk # xylitol study 2026 # sugar substitute heart health # xylitol sweetener # sugar alcohol health risks # xylitol cardiovascular events # sugar free gum xylitol # xylitol heart disease # sugar substitutes heart health # xylitol research # xylitol safety # heart attack study # stroke study