MyFitnessPal is the app that I used and still use to help me lose more than 100 lbs. It helps you track your food intake, exercise and call on your friends to help keep you motivates. This app, owned by under armored.
MyFitnessPal includes access to a million foods and items in a searchable database that lets you easily add your food log to your iPhone or Android. There are also apps for BlackBerry and Windows Phone.
This app and service is free, with apps that make logging easily and a personalized diet profile that helps you set a healthy diet goal and a healthy exercise goal.
MapMyWalk is another app I use when I go on my long walks outdoors.MapMyWalk is a fitness tracking application that enables you to use the built-in GPS of your mobile device to track all of your fitness activities. Record your workout details, including duration, distance, pace, speed, elevation, calories burned, and route traveled on an interactive map. You can even effortlessly save and upload your workout data to MapMyWalk where you can view your route workout data, and comprehensive workout history.