Energy Drinks “Increase Stroke Risk by 500%” Due to Irregular Heartbeats. The primary ingredients of most energy drinks are caffeine and sugar. Many energy drinks also contain aspartame, the artificial sweetener that has been linked to neurotoxic, metabolic, allergenic, fetal, and carcinogenic effects. Consumption of diet drinks is also linked to greater risk of dementia … Continue reading What Your Heart Experiences When You Drink Energy Drinks