Probiotics keep your feline's digestive system working efficiently.
Also, the digestive system needs some space to operate in, so stuffing yourself to the maximum will actually inhibit digestion.
The apple pectin helps to regulate the digestive system and to metabolize fatty acids.
These masses can be large and hard, sometimes too big to either cough up or pass on through the digestive system.
The only carbohydrates they are likely to get are those that may be still encased in the digestive system of their prey.