In the spectrum of choices available for feeding cats, canned food is superior to dry food if only because the moisture content is higher and make a difference in keeping cats properly hydrated.
However, not all canned foods are low in carbohydrates. Many of the popular prescription diets and a good many of the over-the-counter canned foods are extremely high in carbohydrates. If you’re feeding canned food, it’s important to pay attention to both the composition of the food (i.e., what’s the share of protein, carbohydrate, and fat in the food) and the actual ingredients.
The challenge is that weaknesses and loopholes in pet food labeling regulations make it all but impossible to correctly evaluate the precise composition of food – since there is no requirement to list the percentage of calories derived from carbohydrates.