How would high levels of insulin affect appetite?

Answer: Increased hunger and chronic craving for carbohydrates

Explanation: Even if we're not hungry, the body can give us signals to eat, chiefly among the hormones responsible for this is the insulin. Insulin let's energy be sourced from glucose molecules directly from the bloodstream. Abnormally high levels of insulin allows sugar molecules to go iti cells unchecked and this results in an apparent sensation of hunger letting you eat more. Also, consuming high levels of carbs without balancing it with other food classes could lead to abnormal cravings for carbohydrates which could become chronic.