Alba was born in Pomona, California to Mark Alba, who is of Mexican descent, and Cathy Jensen, who has French-Canadian and Danish ancestry. Alba was raised in an Air Force family, along with her brother, Joshua Alba, and her grandparents until she was seventeen. She grew up a sports fanatic. Alba’s early life was marked by a multitude of physical maladies; she suffered collapsed lungs twice, had pneumonia 4-5 times a year, a burst appendix, a cyst on her tonsils and asthma. She had a kidney infection in 2001.This served to isolate her from other children at school because, as she claims, she was in the hospital so often that no one knew her well enough to befriend her. She also revealed on The Tonight Show with Jay Leno that she suffered from obsessive-compulsive disorder as a child. Her health improved, however, when her family moved to California. She suffers from motion sickness, which developed after childhood.
Playboy magazine named Alba among its 25 Sexiest Celebrities, and the Sex Star of the Year in its March 2006 issue, on whose cover she appeared. During an interview with GQ magazine, Alba said that in her teen years she became a born-again Christian in a rebellion against her parents. She left her church after being accused of being promiscuous and wearing provocative clothing. As the daughter of conservative parents, Alba, whose grandparents did not even allow her to wear a bathing suit around the house, maintains a no-nudity clause in her contract, though she has claimed she had been at least open to the possibility of appearing nude in Sin City. She has said that she has no problem with one night stands, but that she no longer dates around.

