Most of us are creatures of habit. We buy the same foods from the same grocery store, prepare the same recipes over and over, and live within our own familiar routines. But if you're serious about eating healthier and losing weight, you need to shake it up, change those bad eating habits, and start thinking differently about your diet and lifestyle.

The problem is that we get so comfortable in our ways that it's hard to give up those old habits.

"Many people are skeptical about changing their diets because they have grown accustomed to eating or drinking the same foods, and there is a fear of the unknown or trying something new," says John Foreyt, PhD, director of the Baylor College of Medicine Behavioral Medicine Research Center.

Even when you want to change, old habits die hard.

"Over time, habits become automatic, learned behaviors, and these are stronger than new habits you are trying to incorporate into your life," says Foreyt.

Even those who manage to change their bad eating habits can easily fall back on their old ways during times of stress. When you're feeling weak or vulnerable, automatic responses often override good intentions.

"Everything can be going along just fine until you hit a rough patch and feelings of boredom, loneliness, depression, or ... any kind of stress," says Foreyt.

Foreyt says tackling bad eating and exercise habits requires a three-pronged approach:

Being aware of the bad habits you want to fix.

Figuring out why these habits exist.

Figuring out how you'll slowly change your bad eating and exercise habits into healthier new ones.

Another expert notes that you're much more likely to be successful at changing your habits if you take things one step at a time. "Try to gradually incorporate new habits over time, and before you know it, you will be eating more healthfully and losing weight," says Keri Gans, MS, RD, American Dietetic Association spokesperson and a nutritionist in private practice in New York.

Eating a healthier diet may be intimidating at first. But once you see for yourself how good it makes you feel -- and how good healthy food can taste -- you have a better chance of succeeding. Over time, your preferences will change and cravings for bad-for-you foods will fade away.