The doctors behind the study have called for greater regulation of the sales and advertising of energy drinks. ack Taylor/Getty ImagesThe doctors behind the study have called for greater regulation of the sales and advertising of energy drinks. ack Taylor/Getty ImagesConsuming lots of energy drinks may raise heart disease and stroke risk, say doctorsStudy cites case of otherwise fit and healthy man in his 50s who had a stroke after eight-drink-a-day habitHeavy consumption of energy drinks may raise the risk of heart disease and pose a serious risk of stroke, doctors have warned. Millions of people worldwide regularly drink the products, which are non-alcoholic and typically contain more than 150mg of caffeine per litre, very high glucose-based sugar content and varying quantities of other chemicals. Doctors in Nottingham, England, sounded the alarm after an otherwise fit and healthy man in his 50s had a stroke and was left with permanent numbness in his hands and feet.