How do I read carbohydrates on a food label?

Total Carbohydrates come the following sources:
Sugars
Dietary Fiber (soluble and insoluble)
Sugar Alcohol
Other Carbohydrates

You may only see dietary fiber and sugars on the food label as subcategories of total carbohydrates. This information is required if there is 1 gram or more in one serving of the product.

This product has 25 grams of total carbohydrates per serving.

1 gram comes from dietary fiber
20 grams come from sugars

You can assume the remaining 4 grams of carbohydrates come from ‘other carbohydrates’ even though it’s not listed on the label.