Why do ivy leaves turn yellow and how can this be prevented or treated?

Ivy leaves turn yellow due to various reasons such as lack of sunlight, overwatering, nutrient deficiencies, or pests. To prevent or treat yellowing leaves, ensure the plant receives adequate sunlight, water it properly, provide necessary nutrients through fertilization, and regularly inspect for pests. Pruning affected leaves and improving overall care can help restore the health of the ivy plant.