I don't personally believe that calorie counting is the best way to achieve healthy eating habits, however, if that's your approach, the Meal Snap app can make the job a whole lot easier.
Available through the iTunes store for just $3, this program incorporates the use of your built-in smartphone camera, encouraging you to take pictures of breakfast, lunch, dinner and any snacks and drinks amidst them. Incredibly, the iPhone application boasts the ability to identify the foods it sees captured within each image, and goes one step further to distinguish the nutritional information of such edibles. DailyBurn has developed the program to log your consumption within a calendar, providing quotidian tallies of total energy intake. The Meal Snap app even allows the user to share his feast's information and statistics on Twitter and Facebook, and check into different restaurants by means of FourSquare.