Serving Size for Fruits and Veggies?

In the quest to stay on track with your ideal weight loss goal, it is necessary to track caloric intake. To effectively count calories, it is also necessary to know what the protein, fats and carbo percentages are in each food type. Here is a source for determing how to calculate serving size and calorie breakdown in terms of proteins, fats and carbs for fruits, vegetables and nuts http://www.producepedia.com/

Do you know of any other sources? Please share.