Add investment banking to the list of things that could be dangerous to your health.

A University of Southern California researcher found insomnia, alcoholism, heart palpitations, eating disorders and an explosive temper in some of the roughly two dozen entry-level investment bankers she shadowed fresh out of business school.

Every individual she observed over a decade developed a stress-related physical or emotional ailment within several years on the job, she says in a study to be published this month.

Investment banking has long been a beacon for ambitious people who crave competition, big money, steak dinners and paid-for town-car service. The 100-hour workweek, these ironmen and ironwomen tell themselves, is just the opening ante in a high-stakes game.

But investment bankers, salespeople and traders are only human. Under the immense stress of their jobs, many suffer personal and emotional problems that escalate into full-blown crises, with some bankers developing conditions that linger long after they have left the industry.