A recent study by the Kaiser Permanente Center for Health Research found that dieters who kept track of what they ate in a food journal lost twice as much weight compared those who didn't.

The results of this study point to food diaries as an inexpensive and straightforward method for weight-loss.

Sites like Fitday.com, and 2000cal.com offer free online services, where you can track what you eat and how many calories it costs you, on-line.

Both sites allow dieters to monitor both their food intake and exercise and set personal goals.

MyFoodDiary.com offers a similar service, for a small monthly fee.