I have found that FAT FREE ice creams replace the fat with mystery ingredients and sugar alcohols 

Serving Size 1/2 cup
Servings Per Container 12
Amount Per Serving
Calories 90
Calories from Fat 0
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Cholesterol 0mg
Sodium 50mg
Total Carbohydrates 21g
Dietary Fiber 3g
Sugars 12g
Sugar Alcohol
Protein 3g
INGREDIENTS: SKIM MILK, SUGAR, POLYDEXTROSE, CORN SYRUP, MALTODEXTRIN, NATURAL FLAVOR, CREAM, PROPYLENE GLYCOL MONOESTERS, MONO & DIGLYCERIDES, CELLULOSE GUM, CAROB BEAN GUM, GUAR GUM, CARRAGEENAN, ANNATTO (FOR COLOR), VITAMIN A PALMITATE, ICE STRUCTURING PROTEIN.