But when does rational concern for one's health spill over into irrational obsession?
The term was later used in psychology to refer to an irrational obsession that so dominates an individual's thoughts as to determine his or her actions.
In Bogotá it is variously attributed to envy, irrational obsession and anger that prosecutors have pursued officials from his government for corruption.
He seems to think that the position of Senator Álvaro Uribe, a former president, is based on "envy, irrational obsession and anger".
I can see now that, though Mr Furtherfield was a kind, amusing, tolerant man, his slow driving was an irrational obsession.
The 34-year-old developed an "irrational obsession" with his victim and lured her to his home under the promise of a get-together with friends, Merthyr crown court heard.
The novel opens at the onset of an irrational obsession that will become its story, when "Chris Kraus, a 39-year-old experimental film-maker and Sylvère Lotringer, a 56-year-old college professor from New York, have dinner with Dick ___, a friendly acquaintance of Sylvère's, at a sushi bar in Pasadena".
Caroline Lucas said: "The Chancellor's new Office for Unconventional Gas and his proposed tax breaks for shale gas reveals the extent of this government's irrational obsession with hard-to-reach shale and with keeping the UK addicted to fossil fuels".
Speaking of nostalgia, did anyone else have an irrational obsession with World Industries as a child?
It's an irrational obsession with leaks; it's an obsession with secrecy and with classification, and it shows a very disturbing willingness to use the Espionage Act, one of the gravest crimes an American can be charged with, using it as a political weapon.
