Answer:
Que-Why are most of the cats fat ?
Ans-Put simply, the reason your cat is fat is that it's eating more calories than it's burning off. This problem is more common among house cats because they tend to be less mobile if not stimulated properly. If your cat is leading a lazy, sedentary lifestyle, it won't lose any weight.
Que-What are the major reasons for that according to WHO ?
Ans-A low-quality diet is the main cause of obesity in cats. According to Cornell University College of Veterinary Medicine, free-feeding is one of the biggest contributors to feline obesity. (Free-feeding means letting your cat have access to a full bowl of dry kibble throughout the day.)
Cats that are less active tend to be overweight, but poor-quality food and underlying health problems can also contribute to weight gain. While dry diets that have more carbohydrates are often blamed, total calories in vs total calories burned is the most important factor to consider.