 Overfeeding can lead to the number one nutritional disease in cats, obesity. Excessive body weight on a fat cat increases their risk of liver disease, heart disease, respiration problems, and constipation. Obese cats are at a greater risk of developing diabetes and arthritis too. If your cat is overweight, check with your local Walla Walla area veterinarian for formulated diets that have fewer calories. This message is brought to you by the Animal Clinic East, serving the Walla Walla Valley's small animal veterinary medical needs.