Diet pills hard on the heart

	Tweet

Supplements that contain ephedra and caffeine-rich guarana, which may be used for weight loss, result in significant cardiovascular and metabolic changes, investigators have found. These changes could be harmful in people with High Blood Pressure, Atherosclerosis (clogged arteries), or glucose intolerance, a precursor to Diabetes marked by elevated blood sugar. All of these conditions are strongly associated with obesity.

Even though the US Food and Drug Administration banned ephedra as a dietary supplement for weight loss, it is still obtainable as a traditional Chinese medicine, ma huang, the authors note in the journal Clinical Pharmacology and Therapeutics. Synthetic ephedrine is also available in convenience stores and over the Internet. Guarana is an herb containing caffeine.

Dr. Christine A. Haller and her colleagues at the University of California, San Francisco tested the effects of Xenadrine RFA (a multi-component supplement containing 25.4 mg ephedra alkaloids and 185 mg caffeine) and ephedra extract (23.2 mg total ephedra alkaloids) plus guarana (167 mg caffeine), compared with placebo, in 16 healthy adults.

They report that repeated dosing of ephedra and guarana produced elevated ephedrine blood concentrations, increased heart rate and blood pressure, and had unfavorable effects on glucose and potassium homeostasis.

These effects could exacerbate obesity-related conditions such as insulin resistance and metabolic syndrome, the authors note.

This study, they conclude, provides further evidence that dietary supplements containing ephedra and guarana or like-compounds could have unfavorable cardiovascular effects, especially in susceptible individuals such as those with High Blood Pressure, glucose intolerance or hardening of the arteries.

SOURCE: Clinical Pharmacology and Therapeutics June 2005.

RELATED STORIES:
Weight in pregnancy best controlled by diet, study shows   FDA advisers recommend approving weight loss drug   Bridal Hunger Games   Exercise, Group Support Work for Weight Loss   Misperception of weight is an important barrier to weight loss   Obesity drugs need heart studies, U.S. advisers say   Weight Loss Surgery and Diabetes: Expert Interview Opportunity   New evidence on effects of green coffee beans in weight loss   Chocolate lovers tend to weigh less: study   Weight loss won’t necessarily help teen girls’ self-esteem   How to Best Help Your Child Lose Weight: Lose Weight Yourself   Qnexa: Is the new anti-obesity drug too risky?

Comments

[ + Post Your Own ]

Now you're in the public comment zone. What follows is not Armenian Medical Network's stuff; it comes from other people and we don't vouch for it. A reminder: By using this Web site you agree to accept our Terms of Service. Click here to read the Rules of Engagement.

There are no comments for this entry yet. [ + Comment here + ]