But the problem is that there is no legal definition of the "net," "active," or "impact" carbs popping up on food labels and advertisements. The only carbohydrate information regulated by the FDA ...

Carbohydrates (also known as sugars) are molecules consisting of a basic unit, usually a six-membered ring, containing carbon and oxygen, either alone (monosaccharides) or joined together ...

Industry and consumer groups have called on the FDA to not only provide a definition for low-carb claims but also address the use of implied low-carb claims and "net carb" counts on product labels.