The mathematical formula for losing weight is annoyingly easy: Calories burned must be greater than calories consumed. The hard part is resisting that post-meal craving for sweets or steering clear of the drive-thru window on your morning commute.
One proven method for eating less is to keep a food journal. Researchers have found that writing down what you eat increases awareness of eating habits and leads directly to better choices [source: Cleveland Clinic].
Wearable fitness trackers like Fitbit now include options for entering food items and entire meals into their smartphone apps. The apps keep a running tally of calorie intake and compare it to calories burned during exercise and other physical activity. They can even help you set up a meal plan that's in line with your weight loss goals [source: Fitbit].
The Fitbit app maintains a huge database of both homemade meals and store brands, and it even has a barcode-scanning function, but logging meals by hand can still be a pain. A controversial new wearable device introduced at the 2015 Consumer Electronics Show claims to automatically track caloric intake by measuring the water content of cells through the skin. The makers of the device claim 84 to 93 percent accuracy, but scientists are highly skeptical [source: Kelion].