Greensick is a relatively archaic term, which was used in the past to describe an individual who was experiencing a health issue that related to the consumption of excessive green vegetables. Synonyms that can be used instead of greensick include green fever, chlorosis, and green-sickness. These terms derive from the belief that consuming too many greens can cause an excess of certain minerals in the bloodstream, causing a variety of symptoms in some individuals. While greensick may not be a commonly used term in modern times, the alternative terms can still be used to describe similar health concerns experienced by individuals who may be consuming a diet that is excessively rich in certain nutrients.