It's that time of year again when millions of Americans vow to create good habits and break bad ones. The psychologist behind PsyBlog explains why it is so difficult to modify our behavior -- and to stick with the change.
Excerpt from "Making Habits, Breaking Habits: Why We Do Things, Why We Don't, and How to Make Any Change Stick" by Jeremy Dean. Copyright 2013 by Jeremy Dean. Reprinted here by permission of Da Capo Lifelong Books. All rights reserved.