According to conventional medicine, diet has nothing to do with outbreaks or recurrence of genital herpes. Frequency of herpes outbreaks depends mainly upon the condition and health of the immune system. Anything that can reduce the immune system’s capability can cause a herpes outbreak. Physical and mental stress, sexual intercourse and menstruation are the most common reasons for herpes and these situations can provoke a herpes outbreak. If you take this in mind, foods that boost your immune system could potentially guard against a herpes outbreak. Caffeine, for example, is known to stress the body and can be avoided. Or, you can watch the intake of sugars. Outbreaks are treated with acyclovir but prevention of more outbreaks can be achieved via an anti-herpes vaccine.