ONLINE TOOLS HAVE long promised to demystify and streamline calorie tracking. Because if you can track your calories, you can create a calorie “deficit.” And taking in fewer calories than you expend ( ...

Over 86 million people in the U.S. use some kind of fitness or calorie-tracking app, making them one of the most common, easily accessible data-crunching tools around. Their appeal is ...

The promise is seductive: Snap a photo of your meal, and artificial intelligence will instantly tell you exactly how many calories you're consuming. No more tedious ...