PETS
The bulk of kibble comprises grains and other high-starch carbs like high-glycemic, genetically modified corn, wheat, rice, or potato. Even grain-free kibble has a lot of starchy carbs like beans, peas, and lentils in it.
It can cause physiological changes like demanding insulin, glucagon, and cortisol fluctuations during the day. The high carbohydrate intake also adds to the existing pet obesity situation.