20 of 29

You obsess over the details

Health shouldn't be seen as something to strive for, but as a way of life, Dr. Rogg says. "When you focus on keeping healthy as an endpoint, as opposed to a healthy lifestyle, you may tend to sort of miss the whole picture."

Too often, Dr. Rogg says, people who want to be healthy focus on avoiding "bad" foods and obsess about numbers, like their body mass index. "The focus that people have to make is on being happy and on things that will make them happy, and enjoy themselves."

Next: You skip vaccines