What are the risks associated with the stimulants in “fat burners”?
Dietary supplements designed to reduce body fat often contain multiple stimulant ingredients (see the FAQ about thermogenic fat burners). Taking two or more stimulants together, especially before or during exercise, may be dangerous as they combine to make the body generate even more heat and can predispose a person to heat injury. This effect can also increase the risk of dehydration. In addition, stimulants typically increase heart rate and blood pressure, which is especially dangerous for those with cardiovascular and central nervous system disorders, among other medical conditions.