Set a goal and then track against that goal. If you're ahead of your goal then take it easy. If you're falling behind it's time to diet harder or get more exercise. Learn more about the line diet concept here or here.
See daily summaries of how much weight you've lost and how much further you have to go. See graphs showing your progress against your goal line and review previous weight entries.
Line Diet is an open source project on Github! It is developed using Xamarin.Forms, Prism, and OxyPlot. If you would like to contribute or are looking to learn mobile development with Xamarin, check it out!