I'm not sure what you mean by a diet chart, but if you go to your Start page, down the left side you can update your weight loss goal. Then go to your nutrition tracker, and at the bottom you'll see your recommended calorie and nutrient ranges based on this goal.
Hope that helps,
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford