FoodGauge

This app is helpful, but I only give it 3 stars due to the annoying 6 second splash screen you have to watch every time you start it and for the inability to use decimals (e.g., cannot enter 2.5, only 2 or 3).

This app makes it so easy to pick the right foods for me. I never understood nutrition info.  This app does exactly what it says it does. Just enter the info from the label, hitting return key each time. Takes a few seconds. 
It rates all my foods and tells me which ones to avoid. I really like the simple interface. The about screen has a helpful link for more info on this brilliant but simple app.