Welcome to Walking the Walk, a feature that takes a deeper look at commonly shared diet and fitness advice. Every other week, I'll choose one piece of advice and practice it for seven days. Then I'll report back on what I discovered about making it work in real life and how it affected my own personal fitness -- and how it ultimately can affect your own efforts.

Common diet advice tells us that we should be able to have our cake (or cookies or brownies or ice cream) and our healthy weight, too ... as long as we remember that treats are treats and are to be only eaten occasionally.

This works for a lot of people. And then there are the rest of us, the ones who buy a bag of snack-sized candy bars, intending to eat just one now and then, and then manage to devour half the bag in one sitting.

With friends like sugar, who needs enemies?

In every single weight loss attempt I've ever made, sugar was the thing that eventually tripped me up. But this time around, it's different. I've had a great deal of success, and I'm doing everything I can to keep those diet derailers from stopping my "downward" progress.

Since my biggest diet derailer is sugar, it has to go. Not for good, but for the long haul. Until my new healthy eating habits are firmly in place, letting myself indulge in even a little treat here and there is playing with fire.

Join me on this week's Walking the Walk, where I learn to live without my favorite vice. No processed or added sugars, period. Buckle up, because it promises to be a wild ride.