From the developer:
"Diet & Exercise Assistant helps you to achieve your fitness and weight loss objectives by giving you the tools you need to manage your diet. Establish a weight loss program by setting a weight loss goal and target date. Monitor progress with historical charts and graphs. A calorie calculator automatically calculates the calories you need to remove from your diet in order to achieve your weight loss goals. Track your nutrition by monitoring calories, carbohydrates, protein, fiber, fat, and saturated fat. A large food database with thousands of food items is available with all of the nutrient information to make tracking your nutrition easy.
"Track your exercise by selecting an activity from a large exercise database. Input the minutes spent exercising, and Diet & Exercise Assistant will automatically calculate the calories you burned. If an exercise is not in the database, you can log your own user-defined exercises. Use the Logbook to quickly summarize the calories you have consumed from food and subtract the calories you expend through exercise, at work, and while resting. The total is then conveniently compared to your goal for the day."