yep it is completely accurate for any food with no free food allowance and is exactly how the snackulator or syn calculator works out things when there is no free food.
all of the below have no free food allowance:
Alcoholic drinks
Biscuits, including cereal bars and savoury crackers
Bread & crispbreads
Breakfast cereals
Cakes & bakery items, e.g. carrot cake
Crisps & snacks
Dressings & dips, e.g. salsa, salad dressing
Fruit - canned, dried and stewed
Pastry products (sweet & savoury), e.g. salmon en croute, apple pie
Pizza
Puddings & desserts
Sandwich/deli fillers
Sandwiches and wraps
Sauces, e.g. jars of tomato-based pasta sauce
Soft drinks, including yogurt drinks fruit/vegetable juice and fruit smoothies
Soups, all varieties
Sweets & chocolates
anything else that does have a free food allowance then you of course need to use the syn calculator, selecting your free food.