Smile Food Tracker is an app that serves as a food & activity journal, and a BMI checker. It helps you keep track of how and what you eat, your activities, and lets you see the effect on your weight. You don't have to worry about counting calories. You can simply increase /decrease food portions at your own descretion and check your BMI to see their effect on it.
Features:
I made use of 'Mockflow' to design the wireframe shown below. It shows how a user can progress from the sign in screen to the chart screen.
Below are the designs of the app screens (I made use of Photoshop):