John Fitzgerald Kennedy had long-standing health problems due to a rare disorder called Addison's Disease. Because of this, he was often certain that death was imminent, and he had his last rites read to him by a priest on three separate occasions when he was feeling severely ill.
Health issues relating to his back and intestines also caused Kennedy to be medically disqualified from the Army when he tried to enlist for WWII. Kennedy's chronic back problems were in part due to the fact that one of his legs was shorter than the other.
Because he was the richest man ever to take the presidential oath, JFK donated his presidential salary to charity. The day before he signed a ban on Cuban imports, he ordered 1,200 Cuban cigars. He danced with a black woman at the presidential inauguration, which was a first at the time. He took a scale with him everywhere he went because he was obsessed with his weight. He feared that he was going to have to run for re-election against Mitt Romney's father. He and Jackie actually had four children. Unfortunately, one was stillborn, and another was born 5 1/2 weeks early and died two days later.