The study noted that some evidence suggested that vegetarian dietary patterns could be associated with reduced mortality, but the relationship is not well established.

The agency is already investigating the safety of energy drinks and energy shots, prompted by consumer reports of illness and death.

Consumers are again without answers after German officials announced that results on beansprouts, suspected to be the culprit behind the massive E. coli outbreak across Europe and now hitting the U.S., tested negative for the deadly strain.