Many times the serving size is smaller than what most people eat. So you may have to double or triple the nutrient amounts listed. For example, on the label below, if you had 2 cups of this food, you would eat 16 gms of fat. This tells you how many grams of fat are in the serving size. Total fat includes saturated, unsaturated, and all other fats.
Total carbohydrate includes fiber, sugars and other carbohydrates.
It gives you a guide for the amount of nutrients you should eat in a day. If your diet is 2,000 calories, you should eat less than 65 gms of fat, etc.