I think almost anyone who uses the Internet can relate to this scenario: You receive an e-mail from a family member or friend alerting you to a health threat that isn’t very well known, but potentially deadly. In recent years, one of the most frequently circulated e-mails of this type has focused on the supposed connection between eating grapefruits and breast cancer risk. As with many of these chain e-mails, there is some basis for the concern. But the question is: How alarmed should we be? Read more »