I think adversity magnifies behavior. Tend to be a control freak? You'll become more controlling. Eat for comfort? You'll eat more. And on the positive, if you tend to focus on solutions and celebrate small successes, that's what you'll do in adversity.
Gretchen Rubin, The Happiness Project: Or Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun
adversity